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    <title>Zippy on 知识带给我们自由</title>
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      <title>BUUCTF [BSidesSF2019]zippy 1</title>
      <link>https://yuexuan521.github.io/zh/posts/buuctf-bsidessf2019zippy-1/</link>
      <pubDate>Mon, 20 Oct 2025 08:00:00 +0000</pubDate>
      <guid>https://yuexuan521.github.io/zh/posts/buuctf-bsidessf2019zippy-1/</guid>
      <description>&lt;p&gt;
&lt;div class=&#34;post-img-view&#34;&gt;
    &lt;a data-fancybox=&#34;gallery&#34; href=&#34;https://cdn.jsdelivr.net/gh/yuexuan521/image/20251228190843252.png&#34;&gt;
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&lt;/div&gt;&lt;/p&gt;
&lt;p&gt;&lt;strong&gt;BUUCTF: &lt;a href=&#34;https://buuoj.cn/challenges&#34;target=&#34;_blank&#34; rel=&#34;noopener noreferrer&#34;&gt;https://buuoj.cn/challenges&lt;/a&gt;&lt;/strong&gt;&lt;/p&gt;
&lt;hr&gt;
&lt;p&gt;相关阅读
&lt;a href=&#34;https://ctf-wiki.org/&#34;target=&#34;_blank&#34; rel=&#34;noopener noreferrer&#34;&gt;CTF Wiki&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;
&lt;div class=&#34;post-img-view&#34;&gt;
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&lt;h3 id=&#34;题目描述&#34;&gt;题目描述：&lt;/h3&gt;
&lt;p&gt;得到的 flag 请包上 flag{} 提交。&lt;/p&gt;
&lt;h3 id=&#34;密文&#34;&gt;密文：&lt;/h3&gt;
&lt;p&gt;下载附件，得到attachment.pcapng文件&lt;/p&gt;
&lt;p&gt;
&lt;div class=&#34;post-img-view&#34;&gt;
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&lt;hr&gt;
&lt;h3 id=&#34;解题思路&#34;&gt;解题思路：&lt;/h3&gt;
&lt;p&gt;1、打开attachment.pcapng文件，流量很少，简单浏览发现执行了两条命令。&lt;/p&gt;</description>
      <content:encoded><![CDATA[<p>
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<p><strong>BUUCTF: <a href="https://buuoj.cn/challenges"target="_blank" rel="noopener noreferrer">https://buuoj.cn/challenges</a></strong></p>
<hr>
<p>相关阅读
<a href="https://ctf-wiki.org/"target="_blank" rel="noopener noreferrer">CTF Wiki</a></p>
<p>
<div class="post-img-view">
    <a data-fancybox="gallery" href="https://cdn.jsdelivr.net/gh/yuexuan521/image/20251228190845318.png">
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<h3 id="题目描述">题目描述：</h3>
<p>得到的 flag 请包上 flag{} 提交。</p>
<h3 id="密文">密文：</h3>
<p>下载附件，得到attachment.pcapng文件</p>
<p>
<div class="post-img-view">
    <a data-fancybox="gallery" href="https://cdn.jsdelivr.net/gh/yuexuan521/image/20251228190846936.png">
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<hr>
<h3 id="解题思路">解题思路：</h3>
<p>1、打开attachment.pcapng文件，流量很少，简单浏览发现执行了两条命令。</p>
<div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
<pre tabindex="0" class="chroma"><code><span class="lnt">1
</span><span class="lnt">2
</span><span class="lnt">3
</span><span class="lnt">4
</span></code></pre></td>
<td class="lntd">
<pre tabindex="0" class="chroma"><code class="language-bash" data-lang="bash"><span class="line"><span class="cl">nc -l -p <span class="m">4445</span> &gt; flag.zip
</span></span><span class="line"><span class="cl">使用 netcat 工具监听端口 <span class="m">4445</span> 并将接收到的数据重定向到 flag.zip 文件。
</span></span><span class="line"><span class="cl">unzip -P supercomplexpassword flag.zip
</span></span><span class="line"><span class="cl">使用 unzip 工具来解压 flag.zip 文件。-P 选项后面跟的是解压密码 supercomplexpassword。
</span></span></code></pre></td></tr></table>
</div>
</div><p>
<div class="post-img-view">
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</div></p>
<p>其中，保存下来的flag.zip文件是解题的关键，解压密码 <code>supercomplexpassword</code> 也有用。</p>
<p>2、在Kali中，使用foremost工具分离流量包中的flag.zip文件</p>
<p>
<div class="post-img-view">
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<p>
<div class="post-img-view">
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        <img src="https://cdn.jsdelivr.net/gh/yuexuan521/image/20251228190851583.png" 
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    </a>
</div></p>
<p>使用解压密码 <code>supercomplexpassword</code> 解压flag.zip文件，得到flag.txt文件，得到flag</p>
<p>
<div class="post-img-view">
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<h3 id="flag">flag：</h3>
<div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
<pre tabindex="0" class="chroma"><code><span class="lnt">1
</span><span class="lnt">2
</span></code></pre></td>
<td class="lntd">
<pre tabindex="0" class="chroma"><code class="language-bash" data-lang="bash"><span class="line"><span class="cl">CTF<span class="o">{</span>this_flag_is_your_flag<span class="o">}</span>
</span></span><span class="line"><span class="cl">flag<span class="o">{</span>this_flag_is_your_flag<span class="o">}</span>
</span></span></code></pre></td></tr></table>
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