Vulnerability Alert

Cisco TelePresence ISDN Gateway D-channel Denial of Service Vulnerability

 
Threat Type:CWE-20: Input Validation
IntelliShield ID:32460
Version:1
First Published:2014 January 22 16:09 GMT
Last Published:2014 January 22 16:09 GMT
Port: Not available
CVE:CVE-2014-0660
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:7.1 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:5.9
 
Version Summary:Cisco TelePresence contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition. Updates are available.
 
 
Description
A vulnerability in the code handling the ISDN Q.931 signaling protocol of the Cisco TelePresence ISDN Gateway could allow an unauthenticated, remote attacker to trigger a drop of the data channel (D-channel), causing all calls to be terminated and preventing users from making new calls.

The vulnerability is due to improper handling of a crafted Q.931 STATUS message. An attacker could exploit this vulnerability by injecting crafted packets in the Q.931 flow. An successful exploit could allow the attacker to trigger a drop of the D-channel. As a result, all active calls handled by the affected system will be terminated and it will not be possible to establish new calls until the D-channel communication is restored. A software reload is necessary to restore normal behavior.

Cisco has confirmed the vulnerability in a security advisory and released software updates.
 
Warning Indicators
Cisco TelePresence ISDN Gateway Software versions prior to 2.2(1.92) are affected.
 
IntelliShield Analysis
Attackers may require access to trusted internal networks to inject crafted packets in the Q.931 flow, reducing the possibility 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 a security advisory for Cisco bug ID CSCui50360 at the following link: cisco-sa-20140122-isdngw
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability to cause all active calls on a targeted device to drop, resulting in a denial of service (DoS) condition. Also, new calls cannot be accepted or made until the affected device reloads, which would also result in a DoS condition.
 
Technical Information
The vulnerability is due to improper handling of crafted Q.931 STATUS messages by a device running the affected software.

An unauthenticated, remote attacker could exploit this vulnerability by injecting crafted packets in the Q.931 flow. A successful exploit could allow the attacker to trigger a drop of the D-channel which would cause all active calls handled by the affected system to terminate, resulting in a DoS condition.
 
Safeguards
Administrators are advised to apply the appropriate updates.

Administrators are advised to allow only trusted users to have network access.

Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected 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:
CiscoCisco TelePresence ISDN GW 3241 2.0 (1.51) | 2.1 (1.22), (1.43), (1.49), (1.56) | 2.2 (1.79)

Associated Products:
N/A




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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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