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ESB-2015.2586 - [Cisco] Cisco TelePresence Video Communication Server (VCS) Expressway: Root compromise - Existing account

Date: 14 October 2015

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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2015.2586
            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
Resolution:        Patch/Upgrade
CVE Names:         CVE-2015-4325  

Original Bulletin: 
   http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151006-vcs

- --------------------------BEGIN INCLUDED TEXT--------------------

Cisco Security Advisory

Cisco TelePresence Video Communication Server (VCS) Expressway Privilege 
Escalation Vulnerability

Medium

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

Summary

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: 
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151006-vcs

Affected Products

    Vulnerable Products

    Cisco TelePresence VCS Expressway Release X8.5.2.

    Products Confirmed Not Vulnerable

    No other Cisco products are currently known to be affected by this 
    vulnerability.

Workarounds

    No workarounds are available.

Fixed Software

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.

URL

    
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151006-vcs

Revision History

    Version 	Description 		Section 	Status 	Date

    1.0 	Initial public release. NA 		Final 	2015-October-06

Legal Disclaimer

THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND
OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR 
FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR 
MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE 
RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME. CISCO EXPECTS TO UPDATE 
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.

- --------------------------END INCLUDED TEXT--------------------

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===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
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===========================================================================
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