Date: 14 October 2015
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AUSCERT External Security Bulletin Redistribution
Cisco TelePresence Video Communication Server (VCS)
Expressway Privilege Escalation Vulnerability
14 October 2015
AusCERT Security Bulletin Summary
Product: Cisco TelePresence Video Communication Server (VCS) Expressway
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Root Compromise -- Existing Account
CVE Names: CVE-2015-4325
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Cisco Security Advisory
Cisco TelePresence Video Communication Server (VCS) Expressway Privilege
Advisory ID: cisco-sa-20151006-vcs
Published: 2015 October 6 00:00 GMT
Version 1.0: Interim
CVSS Score: Base - 6.6
Workarounds: No workarounds available
Cisco Bug IDs: CSCuv12272 CVE-2015-4325 CWE-264
A vulnerability in the process management code of the Cisco TelePresence
Video Communication Server (VCS) Expressway could allow an authenticated,
local attacker to run arbitrary programs with elevated privileges.
The vulnerability is due to the failure to protect a supervised process.
An attacker could exploit this vulnerability by completing a series of steps
that ultimately allows a lower-privileged process to be restarted with root
privilege. An attacker would need to crash a firestarter.py supervised process
before the privilege is escalated after the process is restarted. A successful
exploit could allow the attacker to gain elevated privileges on the device,
which could result in a complete system compromise.
Cisco has not released software updates that address this vulnerability.
Workarounds that mitigate this vulnerability are not available. This advisory
is available at the following link:
Cisco TelePresence VCS Expressway Release X8.5.2.
Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by this
No workarounds are available.
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.
Exploitation and Public Announcements
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.
Version Description Section Status Date
1.0 Initial public release. NA Final 2015-October-06
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THIS DOCUMENT AS NEW INFORMATION BECOMES AVAILABLE.
A stand-alone copy or paraphrase of the text of this document that omits
the distribution URL is an uncontrolled copy, and may lack important
information or contain factual errors. The information in this document is
intended for end-users of Cisco products.
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