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AUSCERT External Security Bulletin Redistribution
ESB-2015.2129
Cisco TelePresence Video Communication Server Expressway
Access Vulnerability
17 August 2015
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AusCERT Security Bulletin Summary
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Product: Cisco TelePresence Video Communication Server Expressway
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Unauthorised Access -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2015-4319
Original Bulletin:
http://tools.cisco.com/security/center/viewAlert.x?alertId=40442
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Vulnerability Alert
Cisco TelePresence Video Communication Server Expressway Access Vulnerability
Threat Type: CWE-255: Credentials Management
IntelliShield ID: 40442
Version: 1
First Published: 2015 August 14 20:15 GMT
Last Published: 2015 August 14 20:15 GMT
Port: Not available
CVE: CVE-2015-4319
Urgency: Unlikely Use
Credibility: Confirmed
Severity: Mild Damage
CVSS Base: 4.0
CVSS Version 2.0
CVSS Temporal: 3.3
Version Summary: Cisco TelePresence Video Communication Server Expressway
contains a vulnerability that could allow an authenticated, remote attacker to
make unauthorized changes to user passwords. Updates are available.
Description
A vulnerability in the Password Change functionality in the Administrative Web
Interface of the Cisco TelePresence Video Communication Server (VCS)
Expressway could allow an authenticated, remote attacker to make unauthorized
changes to user passwords.
The vulnerability is due to insufficient enforcement in the authorization
process. An attacker could exploit this vulnerability by sending a specially
crafted packet to the target device. An exploit could allow the attacker to
change the password of active users to conduct further attacks.
Cisco has confirmed the vulnerability and software updates are available.
Warning Indicators
At the time this alert was first published, Cisco VCS Expressway version
X8.5.1 was vulnerable. Later releases of Cisco VCS Expressway may also be
vulnerable.
IntelliShield Analysis
An authenticated, remote attacker could utilize this vulnerability by sending
a specially crafted packet to the targeted device.
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 CSCuv12338 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 change
the password of active users and conduct further attacks.
Technical Information
Additional technical information is unavailable.
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 trusted users to have network access.
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 .1
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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