Cisco ASA/Firepower Threat Defense Web Services Interface HTTP Requests input validation

Summaryinfo

A vulnerability identified as problematic has been detected in Cisco ASA and Firepower Threat Defense. This affects an unknown function of the component Web Services Interface. This manipulation as part of HTTP Requests causes input validation. This vulnerability is handled as CVE-2020-3452. The attack can be initiated remotely. Additionally, an exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability has been found in Cisco ASA and Firepower Threat Defense (Firewall Software) (affected version not known) and classified as problematic. Affected by this vulnerability is some unknown functionality of the component Web Services Interface. The manipulation as part of a HTTP Requests leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect confidentiality. The summary by CVE is:

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.

The weakness was released 07/22/2020 as cisco-sa-asaftd-ro-path-KJuQhB as confirmed advisory (Website). The advisory is shared at tools.cisco.com. This vulnerability is known as CVE-2020-3452 since 12/12/2019. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are unknown but a public exploit is available.

It is possible to download the exploit at exploit-db.com. It is declared as attacked. We expect the 0-day to have been worth approximately $5k-$25k. The CISA Known Exploited Vulnerabilities Catalog lists this issue since 11/03/2021 with a due date of 05/03/2022:

Apply updates per vendor instructions.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Exploit-DB (48722). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Firewall Software

Vendor

• Cisco

Name

• ASA
• Firepower Threat Defense

License

• commercial

Website

• Vendor: https://www.cisco.com/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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