#VU60966 Path traversal in Cisco Expressway and TelePresence Video Communication Server (VCS) - CVE-2022-20754

Vulnerability identifier: #VU60966

Vulnerability risk: Medium

CVSSv4.0: 6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2022-20754

CWE-ID: CWE-22

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Cisco Expressway
Server applications / Conferencing, Collaboration and VoIP solutions
TelePresence Video Communication Server (VCS)
Other software / Other software solutions

Vendor: Cisco Systems, Inc

Description

The vulnerability allows a remote user to overwrite arbitrary files on the system.

The vulnerability exists due to input validation error when processing directory traversal sequences in the cluster database API. A remote authenticated user can send a specially crafted HTTP request and overwrite arbitrary files with root privileges.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Cisco Expressway: X14.0.3 - X14.0.4

TelePresence Video Communication Server (VCS): X14.0.3 - X14.0.4

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External links
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-expressway-filewrite-87Q5YRk
https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwa25107

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated privileged user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.