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AUSCERT External Security Bulletin Redistribution
ESB-2020.2522.4
Cisco Adaptive Security Appliance Software and Firepower Threat Defense
Software Web Services Read-Only Path Traversal Vulnerability
29 July 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Adaptive Security Appliance Software
Cisco Firepower Threat Defence
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Access Confidential Data -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-3452
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-ro-path-KJuQhB86
Revision History: July 29 2020: Vendor added more detail on potential impact
within summary section
July 27 2020: Setting ALERT flag for public exploitation attempts
July 24 2020: Vendor included information on availability of
public exploit code and mitigation details
July 23 2020: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco Adaptive Security Appliance Software and Firepower Threat Defense
Software Web Services Read-Only Path Traversal Vulnerability
Priority: High
Advisory ID: cisco-sa-asaftd-ro-path-KJuQhB86
First Published: 2020 July 22 16:00 GMT
Last Updated: 2020 July 28 22:02 GMT
Version 1.4: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvt03598
CVE-2020-3452
CWE-20
Summary
o A vulnerability in the web services interface of Cisco Adaptive Security
Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software
could allow an unauthenticated, remote attacker to conduct directory
traversal attacks and read sensitive files on a targeted system.
The vulnerability is due to a lack of proper input validation of URLs in
HTTP requests processed by an affected device. An attacker could exploit
this vulnerability by sending a crafted HTTP request containing directory
traversal character sequences to an affected device. A successful exploit
could allow the attacker to view arbitrary files within the web services
file system on the targeted device. As an example , this could allow an
attacker to impersonate another VPN user and establish a Clientless SSL VPN
or AnyConnect VPN session to the device as that user.
The web services file system is enabled when the affected device is
configured with either WebVPN or AnyConnect features. This vulnerability
cannot be used to obtain access to ASA or FTD system files or underlying
operating system (OS) files.
Cisco has released software updates that address this vulnerability. There
are no workarounds that address this vulnerability.
Note: Cisco has become aware of the availability of public exploit code and
active exploitation of the vulnerability that is described in this
advisory. Cisco encourages customers with affected products to upgrade to a
fixed release as soon as possible.
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-asaftd-ro-path-KJuQhB86
Affected Products
o Vulnerable Products
This vulnerability affects Cisco products if they are running a vulnerable
release of Cisco ASA Software or Cisco FTD Software with a vulnerable
AnyConnect or WebVPN configuration.
ASA Software
In the following table, the left column lists the Cisco ASA features that
are vulnerable. The right column indicates the basic configuration for the
feature from the show running-config CLI command. If the device is
configured for one of these features, it is vulnerable.
Cisco ASA Vulnerable Configuration
Feature
AnyConnect
IKEv2
Remote crypto ikev2 enable client-services port
Access
(with
client
services)
AnyConnect webvpn
SSL VPN enable
Clientless webvpn
SSL VPN enable
FTD Software
In the following table, the left column lists the Cisco FTD features that
are vulnerable. The right column indicates the basic configuration for the
feature from the show running-config CLI command. If the device is
configured for one of these features, it is vulnerable.
On devices running Cisco FTD Software, the show running-config command is
available from Diagnostic CLI mode only. To enter Diagnostic CLI mode, use
the system support diagnostic-cli command in the regular Firepower Threat
Defense CLI.
Cisco FTD Vulnerable Configuration
Feature
AnyConnect
IKEv2
Remote
Access crypto ikev2 enable client-services port
(with
client
services)
^1,2
AnyConnect webvpn
SSL VPN ^ enable
1,2
1. Remote Access VPN features are enabled via Devices > VPN > Remote Access
in the Cisco Firepower Management Center (FMC) or via Device > Remote
Access VPN in Cisco Firepower Device Manager (FDM).
2. Remote Access VPN features were first supported as of Cisco FTD Software
Release 6.2.2.
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by this vulnerability.
Cisco has confirmed that this vulnerability does not affect Cisco Firepower
Management Center (FMC) Software.
Details
o The attacker can view files within the web services file system only. The
web services file system is enabled for the WebVPN and AnyConnect features
outlined in the Vulnerable Products section of this advisory; therefore,
this vulnerability does not apply to the ASA and FTD system files or
underlying operating system (OS) files. The web services files that the
attacker can view may have information such as WebVPN configuration,
bookmarks, web cookies, partial web content, and HTTP URLs.
Workarounds
o There are no workarounds that address this vulnerability.
To help detect and/or block attempts to exploit the vulnerability that is
described in this advisory, customers who use the SSL Decryption feature
for affected traffic on Cisco Firepower sensors can enable Snort rules
54598 through 54601, from SRU number 2020-07-22-001 , by using the Cisco
Firepower Management Center.
Fixed Software
o Cisco has released free software updates that address the vulnerability
described in this advisory. Customers may only install and expect support
for software versions and feature sets for which they have purchased a
license. By installing, downloading, accessing, or otherwise using such
software upgrades, customers agree to follow the terms of the Cisco
software license:
https://www.cisco.com/c/en/us/products/end-user-license-agreement.html
Additionally, customers may only download software for which they have a
valid license, procured from Cisco directly, or through a Cisco authorized
reseller or partner. In most cases this will be a maintenance upgrade to
software that was previously purchased. Free security software updates do
not entitle customers to a new software license, additional software
feature sets, or major revision upgrades.
When considering software upgrades , customers are advised to regularly
consult the advisories for Cisco products, which are available from the
Cisco Security Advisories page , to determine exposure and a complete
upgrade solution.
In all cases, customers should ensure that the devices to be upgraded
contain sufficient memory and confirm that current hardware and software
configurations will continue to be supported properly by the new release.
If the information is not clear, customers are advised to contact the Cisco
Technical Assistance Center (TAC) or their contracted maintenance
providers.
Customers Without Service Contracts
Customers who purchase directly from Cisco but do not hold a Cisco service
contract and customers who make purchases through third-party vendors but
are unsuccessful in obtaining fixed software through their point of sale
should obtain upgrades by contacting the Cisco TAC: https://www.cisco.com/c
/en/us/support/web/tsd-cisco-worldwide-contacts.html
Customers should have the product serial number available and be prepared
to provide the URL of this advisory as evidence of entitlement to a free
upgrade.
Fixed Releases
In the following table(s), the left column lists Cisco software releases.
The right column indicates whether a release is affected by the
vulnerability described in this advisory and the first release that
includes the fix for this vulnerability.
Cisco ASA Software
Cisco ASA Software Release First Fixed Release for This Vulnerability
Earlier than 9.6 ^1 Migrate to a fixed release.
9.6 9.6.4.42
9.7 ^1 Migrate to a fixed release.
9.8 9.8.4.20
9.9 9.9.2.74
9.10 9.10.1.42
9.12 9.12.3.12
9.13 9.13.1.10
9.14 9.14.1.10
1. Cisco ASA Software releases 9.5 and earlier, as well as Release 9.7,
have reached end of software maintenance. Customers are advised to migrate
to a supported release that includes the fix for this vulnerability.
Cisco FTD Software
Cisco FTD Software Release First Fixed Release for This Vulnerability
Earlier than 6.2.2 Not vulnerable.
6.2.2 Migrate to a fixed release.
6.2.3 6.2.3.16
Migrate to 6.4.0.9 + Hot Fix or to 6.6.0.1
or
6.3.0 6.3.0.5 + Hot Fix ^1 (August 2020)
or
6.3.0.6 (Fall 2020)
6.4.0.9 + Hot Fix ^1
6.4.0 or
6.4.0.10 (August 2020)
Migrate to 6.6.0.1
or
6.5.0 6.5.0.4 + Hot Fix ^1 (August 2020)
or
6.5.0.5 (Fall 2020)
6.6.0 6.6.0.1
1. For hot fix details please refer to the table below.
Cisco FTD Software Hot Fix Details
Cisco FTD Software Hot Fix File Names
Release
(August 2020)
6.3.0.5 Cisco_FTD_Hotfix_AV-6.3.0.6-3.sh.REL.tar
Cisco_FTD_SSP_Hotfix_AV-6.3.0.6-3.sh.REL.tar
Cisco_FTD_SSP_FP2K_Hotfix_AV-6.3.0.6-3.sh.REL.tar
Cisco_FTD_Hotfix_BM-6.4.0.10-2.sh.REL.tar
6.4.0.9 Cisco_FTD_SSP_FP1K_Hotfix_BM-6.4.0.10-2.sh.REL.tar
Cisco_FTD_SSP_FP2K_Hotfix_BM-6.4.0.10-2.sh.REL.tar
Cisco_FTD_SSP_Hotfix_BM-6.4.0.10-2.sh.REL.tar
(August 2020)
6.5.0.4 Cisco_FTD_Hotfix_O-6.5.0.5-3.sh.REL.tar
Cisco_FTD_SSP_FP2K_Hotfix_O-6.5.0.5-3.sh.REL.tar
Cisco_FTD_SSP_FP1K_Hotfix_O-6.5.0.5-3.sh.REL.tar
Cisco_FTD_SSP_Hotfix_O-6.5.0.5-3.sh.REL.tar
To upgrade to a fixed release of Cisco FTD Software, customers can do one
of the following:
For devices that are managed by using Cisco Firepower Management Center
(FMC), use the FMC interface to install the upgrade. After installation
is complete, reapply the access control policy.
For devices that are managed by using Cisco Firepower Device Manager
(FDM), use the FDM interface to install the upgrade. After installation
is complete, reapply the access control policy.
Exploitation and Public Announcements
o The Cisco Product Security Incident Response Team (PSIRT) is aware of the
existence of public exploit code and active exploitation of the
vulnerability that is described in this advisory.
Source
o Cisco would like to thank Mikhail Klyuchnikov of Positive Technologies and
Abdulrahman Nour and Ahmed Aboul-Ela of RedForce for independently
reporting this vulnerability.
Cisco Security Vulnerability Policy
o To learn about Cisco security vulnerability disclosure policies and
publications, see the Security Vulnerability Policy . This document also
contains instructions for obtaining fixed software and receiving security
vulnerability information from Cisco.
Action Links for This Advisory
o Snort Rule 54598
Snort Rule 54599
Snort Rule 54600
Snort Rule 54601
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-asaftd-ro-path-KJuQhB86
Revision History
o +---------+----------------------+-----------------+--------+-------------+
| Version | Description | Section | Status | Date |
+---------+----------------------+-----------------+--------+-------------+
| 1.4 | Added more detail on | Summary | Final | 2020-JUL-28 |
| | potential impact. | | | |
+---------+----------------------+-----------------+--------+-------------+
| | Updated to indicate | Exploitation | | |
| 1.1 | the availability of | and Public | Final | 2020-JUL-23 |
| | public exploit code. | Announcements | | |
+---------+----------------------+-----------------+--------+-------------+
| | Updated to alert | Summary, | | |
| 1.2 | about active | Exploitation | Final | 2020-JUL-23 |
| | exploitation. | and Public | | |
| | | Announcements | | |
+---------+----------------------+-----------------+--------+-------------+
| 1.3 | Added mitigation | Workarounds | Final | 2020-JUL-23 |
| | details. | | | |
+---------+----------------------+-----------------+--------+-------------+
| 1.0 | Initial public | - | Final | 2020-JUL-22 |
| | release. | | | |
+---------+----------------------+-----------------+--------+-------------+
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