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Vulnerability Alert

Cisco Carrier Routing System Small Packets Denial of Service Vulnerability

 
Threat Type:CWE-399: Resource Management Errors
IntelliShield ID:27991
Version:1
First Published:2013 January 28 17:01 GMT
Last Published:2013 January 28 17:01 GMT
Port: Not available
CVE:CVE-2013-1112
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:5.0 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:4.1
Related Resources:
View related Security Notice
 
 
Version Summary:Cisco Carrier Routing System contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition on a targeted system. Updates are available.
 
 
Description
Cisco Carrier Routing System (CRS) contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on a targeted system.

The vulnerability is due to the improper handling of malformed packets processed by the affected software. An unauthenticated, remote attacker could exploit the vulnerability by sending malformed packets to a targeted device. Processing the malformed packets could slow down the processing of legitimate traffic, resulting in a DoS condition.

Cisco has confirmed this vulnerability in a security notice and software updates are available.
 
Warning Indicators
Cisco CRS versions prior to 4.3(1.16)l are vulnerable.
 
IntelliShield Analysis
To exploit this vulnerability, an attacker must be able to submit malformed packets to the targeted device, likely requiring the attacker to access trusted, internal networks. This access requirement limits 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 a security notice for Cisco bug ID CSCud79136 at the following link: CVE-2013-1112
 
Impact
An unauthenticated, remote attacker could exploit the vulnerability to cause a partial drop of legitimate traffic passing through the targeted device, resulting in a DoS condition for legitimate users.
 
Technical Information
The vulnerability is due to the improper handling of malformed packets processed by the affected software.

An unauthenticated, remote attacker could exploit the vulnerability by sending malformed packets to a targeted device. Processing the malformed packets could slow down the processing of legitimate traffic, 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 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 e-mail at tac@cisco.com.
 
Alert History
 
Initial Release


Product Sets
 
The security vulnerability applies to the following combinations of products.

Primary Products:
N/A

Associated Products:
CiscoCisco Carrier Routing System (CRS) 4.1 Base




Alerts and bulletins on the Cisco Security Intelligence Operations Portal are highlighted by analysts in the Cisco Threat Operations Center and represent a subset of the comprehensive content that is available through Cisco Security IntelliShield Alert Manager Service. This customizable threat and vulnerability alert service provides security staff with access to timely, accurate, and credible information about threats and vulnerabilities that may affect their environment.


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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