A vulnerability in the symbolic link operation of the Cisco TelePresence Video Communication Server (VCS) Expressway could allow an authenticated, local attacker to perform a symbolic link attack on the affected system. The vulnerability is due to insufficient protection of files. An attacker could exploit this vulnerability by creating a malicious symbolic link to a location not otherwise accessible to the attacker. An exploit could allow the attacker to insert unauthorized content in the linked-to file. Cisco has released software updates that address these vulnerabilities. Workarounds that mitigate these vulnerabilities are not available. This advisory is available at the following link: http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151007-vcs
When considering software upgrades, customers are advised to consult the Cisco Security Advisories and Responses archive at http://www.cisco.com/go/psirt and review subsequent advisories 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.
The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
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.
| Version | Description | Section | Status | Date |
|---|---|---|---|---|
| 1.0 | Initial public release. | NA | Final | 2015-October-07 |
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