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ESB-2015.2198 - [Cisco] Cisco TelePresence Video Communication Server: Execute arbitrary code/commands - Existing account

Date: 21 August 2015

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2015.2198
         Cisco TelePresence Video Communication Server Expressway
                      Command Injection Vulnerability
                              21 August 2015

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Cisco TelePresence Video Communication Server
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Execute Arbitrary Code/Commands -- Existing Account
                   Increased Privileges            -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2015-4329  

Original Bulletin: 
   http://tools.cisco.com/security/center/viewAlert.x?alertId=40523

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

Vulnerability Alert

Cisco TelePresence Video Communication Server Expressway Command Injection 
Vulnerability

Threat Type: CWE-78: OS Command Injections

IntelliShield ID: 40523

Version: 1

First Published: 2015 August 18 15:47 GMT

Last Published: 2015 August 18 15:47 GMT

Port: Not available

CVE: CVE-2015-4329

Urgency: Unlikely Use 

Credibility: Confirmed 

Severity: Mild Damage 

CVSS Base: 6.0 

CVSS Version 2.0

CVSS Temporal: 5.0

Version Summary: Cisco TelePresence Video Communication Server Expressway 
contains a vulnerability that could allow an authenticated, remote attacker to
execute arbitrary commands on a targeted system. Updates are available.

Description

A vulnerability in the administrator web interface of the Cisco TelePresence 
Video Communication Server (VCS) Expressway could allow an authenticated, 
remote attacker to execute arbitrary commands on the underlying operating 
system of a targeted device.

The vulnerability is due to insufficient input validation. An attacker could 
exploit this vulnerability by authenticating to the affected device and 
submitting crafted HTTP requests. A successful exploit could allow the 
attacker to execute operating system commands and escalate privileges to 
increase the level of access to the targeted system.

Cisco has confirmed the vulnerability and software updates are available.

Warning Indicators

At the time this alert was first published, Cisco VCS Expressway version 
X8.5.2 was vulnerable. Later releases of Cisco VCS Expressway may also be 
vulnerable.

IntelliShield Analysis

An authenticated, remote attacker could utilize this vulnerability by sending
crafted HTTP requests to the targeted device. Devices utilizing default 
configuration settings are vulnerable to this exploit.

To exploit this vulnerability, an attacker requires authenticated access to 
the targeted system. Authenticated access may require the attacker to access 
trusted, internal networks. These requirements could limit the likelihood of a
successful exploit.

Cisco indicates through the CVSS score that functional exploit code exists; 
however, the code is not known to be publicly available.

Vendor Announcements

Cisco has released bug ID CSCuv11796 for registered users, which contains 
additional details and an up-to-date list of affected product versions.

Impact

An authenticated, remote attacker could exploit this vulnerability to execute
operating system commands and escalate privileges to increase the level of 
access to the targeted system.

Technical Information

The vulnerability is due to insufficient input validation on an affected 
system utilizing default configuration settings.

An authenticated, remote attacker could exploit this vulnerability by sending
crafted HTTP requests to a targeted system. A successful exploit could result
in the execution of operating system commands on a targeted system, and the 
leveraging of escalated privileges, which could increase attacker user-level 
access to the affected system.

Safeguards

Administrators are advised to apply the appropriate updates.

Administrators are advised to allow only trusted users to access local 
systems.

Administrators are advised to allow only privileged users to access 
administration or management systems.

Administrators are advised to monitor affected systems.

Patches/Software

Cisco customers with active contracts can obtain updates through the Software
Center at the following link: Cisco. Cisco customers without contracts can 
obtain upgrades by contacting the Cisco Technical Assistance Center at 
1-800-553-2447 or 1-408-526-7209 or via email at tac@cisco.com.

Alert History

Initial Release

Product Sets

The security vulnerability applies to the following combinations of products.

Primary Products:

Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.5 .2

Associated Products:

N/A

LEGAL DISCLAIMER

The urgency and severity ratings of this alert are not tailored to individual
users; users may value alerts differently based upon their network 
configurations and circumstances. THE ALERT, AND INFORMATION CONTAINED 
THEREIN, ARE PROVIDED ON AN "AS IS" BASIS AND DO NOT IMPLY ANY KIND OF 
GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS
FOR A PARTICULAR USE. YOUR USE OF THE ALERT, AND INFORMATION CONTAINED 
THEREIN, OR MATERIALS LINKED FROM THE ALERT, IS AT YOUR OWN RISK. INFORMATION
IN THIS ALERT AND ANY RELATED COMMUNICATIONS IS BASED ON OUR KNOWLEDGE AT THE
TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES 
THE RIGHT TO CHANGE OR UPDATE ALERTS AT ANY TIME.

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

Internet Email: auscert@auscert.org.au
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