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Vulnerability Alert

Cisco IOS Software SNMP Query Processing Denial of Service Vulnerability

 
Threat Type:CWE-119: Buffer Errors
IntelliShield ID:29048
Version:1
First Published:2013 April 19 22:04 GMT
Last Published:2013 April 19 22:04 GMT
Port: Not available
CVE:CVE-2013-1217
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:6.8 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:5.6
 
 
Version Summary:Cisco IOS Software contains a vulnerability that could allow an authenticated, remote attacker to cause a denial of service condition. Updates are available.
 
 
Description
A vulnerability in the generic input/output control mechanism of Cisco IOS devices could allow an authenticated, remote attacker to trigger a reload of the Supervisor Engine or the device resulting in a denial of service condition.

The vulnerability is due to incorrect buffer handling. An attacker could exploit this vulnerability by running multiple simultaneous SNMP queries against the affected system. An exploit could allow the attacker to trigger a reload of the Supervisor Engine or the device resulting in a denial of service condition.

Cisco has confirmed the vulnerability in a security notice and software updates are available.
 
Warning Indicators
At the time this alert was first published, Cisco IOS Software versions 15.0(2)SQA2 and prior were vulnerable. Later versions of Cisco IOS Software may also be affected.
 
IntelliShield Analysis
To exploit this vulnerability, the attacker must authenticate to a targeted system to send multiple SNMP queries. This access requirement limits the possibility of a successful exploit.

Customers are advised to review the bug report in the Vendor Announcements section for a current list of affected versions.

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 bug ID CSCub41105 at the following link: CVE-2013-1217
 
Impact
An authenticated, remote attacker could exploit this vulnerability to trigger a reload of the Supervisor Engine of an affected device, resulting in a denial of service (DoS) condition.
 
Technical Information
The vulnerability is due to improper buffer handling by the affected software while processing multiple simultaneous SNMP queries.

An authenticated, remote attacker could exploit this vulnerability by running multiple simultaneous SNMP queries against a targeted system. If successful, the attacker could cause the Service Engine on the affected device to reload, resulting in a DoS condition.
 
Safeguards
Administrators are advised to apply the appropriate updates.

It is critical to prevent unauthorized direct communication to network devices. Restrict network traffic destined for the network infrastructure to protect against reconnaissance and DoS attacks. For configuration details, consult Protecting Your Core: Infrastructure Protection Access Control Lists.

Apply hardware rate limiter features to limit packets that require processing by the device CPU to mitigate DoS attacks. See the vendor documentation for specific configuration instructions. For hardware rate limiting configuration details, consult the Cisco Catalyst 6500 Denial of Service (DoS) Protection Configuration Guide.

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 should contact their Cisco support team for assistance in upgrading to a software version that includes fixes for this vulnerability. Cisco customers without contracts may contact the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via e-mail at tac@cisco.com for assistance.
 
Alert History
 
Initial Release


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

Primary Products:
CiscoIOS 15.0SQA 15.0(2)SQA, 15.0(2)SQA1, 15.0(2)SQA2

Associated Products:
N/A




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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