Headline
CVE-2020-3452: Cisco Security Advisory: Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Web Services Read-Only Path Traversal Vulnerability
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. 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 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.htmlAdditionally, 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 9.61
Migrate to a fixed release.
9.6
9.6.4.42
9.71
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
6.3.0
Migrate to 6.4.0.9 + Hot Fix or to 6.6.0.1
or
6.3.0.5 + Hot Fix1
or
6.3.0.6 (Fall 2020)6.4.0
6.4.0.9 + Hot Fix1
or
6.4.0.10 (Fall 2020)6.5.0
Migrate to 6.6.0.1
or
6.5.0.4 + Hot Fix1
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 Release
Hot Fix File Names
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.tar6.4.0.9
Cisco_FTD_Hotfix_BM-6.4.0.10-2.sh.REL.tar
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.tar6.5.0.4
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.tarTo 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.