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AUSCERT External Security Bulletin Redistribution
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
CVE Names: CVE-2015-4329
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Cisco TelePresence Video Communication Server Expressway Command Injection
Threat Type: CWE-78: OS Command Injections
IntelliShield ID: 40523
First Published: 2015 August 18 15:47 GMT
Last Published: 2015 August 18 15:47 GMT
Port: Not available
Urgency: Unlikely Use
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.
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.
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
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
Cisco indicates through the CVSS score that functional exploit code exists;
however, the code is not known to be publicly available.
Cisco has released bug ID CSCuv11796 for registered users, which contains
additional details and an up-to-date list of affected product versions.
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.
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.
Administrators are advised to apply the appropriate updates.
Administrators are advised to allow only trusted users to access local
Administrators are advised to allow only privileged users to access
administration or management systems.
Administrators are advised to monitor affected systems.
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 email@example.com.
The security vulnerability applies to the following combinations of products.
Cisco Cisco TelePresence Video Communication Server (VCS) Expressway X8.5 .2
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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