Cisco Expressway Series and Cisco TelePresence Video Communication Server Vulnerabilities [CVE-2022-20812 and CVE-2022-20813]

CVE numbers = CVE-2022-20812 and CVE-2022-20813

Multiple vulnerabilities in the API and in the web-based management interface of Cisco Expressway Series and Cisco TelePresence Video Communication Server (VCS) could allow a remote attacker to overwrite arbitrary files or conduct null byte poisoning attacks on an affected device.

Note: Cisco Expressway Series refers to the Expressway Control (Expressway-C) device and the Expressway Edge (Expressway-E) device.

For more information about these vulnerabilities, see the Details section of this advisory.

Cisco has released software updates that address these vulnerabilities. There are no workarounds that address these vulnerabilities.

Vulnerable Products

These vulnerabilities affect Cisco Expressway Series software and Cisco TelePresence VCS software if they are in the default configuration.

The vulnerabilities are not dependent on one another. Exploitation of one of the vulnerabilities is not required to exploit another vulnerability. In addition, a software release that is affected by one of the vulnerabilities may not be affected by the other vulnerabilities.

Details about the vulnerabilities are as follows:

CVE-2022-20812: Cisco Expressway Series and Cisco TelePresence VCS Arbitrary File Overwrite Vulnerability

A vulnerability in the cluster database API of Cisco Expressway Series and Cisco TelePresence VCS could allow an authenticated, remote attacker with Administrator read-write privileges on the application to conduct absolute path traversal attacks on an affected device and overwrite files on the underlying operating system as a root user.

This vulnerability is due to insufficient input validation of user-supplied command arguments. An attacker could exploit this vulnerability by authenticating to the system as an administrative read-write user and submitting crafted input to the affected command. A successful exploit could allow the attacker to overwrite arbitrary files on the underlying operating system as the root user.

Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

CVE-2022-20813: Cisco Expressway Series and Cisco TelePresence VCS Null Byte Poisoning Vulnerability

A vulnerability in the certificate validation of Cisco Expressway Series and Cisco TelePresence VCS could allow an unauthenticated, remote attacker to gain unauthorized access to sensitive data.

This vulnerability is due to improper certificate validation. An attacker could exploit this vulnerability by using a man-in-the-middle technique to intercept the traffic between devices, and then using a crafted certificate to impersonate the endpoint. A successful exploit could allow the attacker to view the intercepted traffic in clear text or alter the contents of the traffic.

Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

Further Information

This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-expressway-overwrite-3buqW8LH