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Vulnerability Alert

Cisco IOSĀ Gigabit Switch Router PIM Packet Processing Denial of Service Vulnerability

 
Threat Type:CWE-399: Resource Management Errors
IntelliShield ID:16638
Version:1
First Published:2008 September 24 19:25 GMT
Last Published:2008 September 24 19:25 GMT
Port: Not available
CVE:CVE-2008-3809
BugTraq ID:31356
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:7.8 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:6.4
 
Version Summary:

Cisco IOS Gigabit Switch Router contains a vulnerability that could allow an unauthenticated, remote attacker to cause the affected router to crash.? Updates are available.

 
 
Description

Cisco IOS Gigabit Switch Router (GSR) devices that are configured for Protocol Independent Multicast (PIM) contain a vulnerability that could allow an unauthenticated, remote attacker to cause the device to crash.

The vulnerability is due to an error that may occur when the devices process crafted PIM packets.  An attacker could exploit the vulnerability by sending a crafted request to the affected system.  An exploit could allow the attacker to cause the GSR device to crash, which may result in a denial of service (DoS) condition.

Cisco has confirmed the vulnerability in a security advisory and released updated versions.

 
Warning Indicators

A complete list of affected Cisco IOS devices is available at the following link: cisco-sa-20080924-multicast?

 
IntelliShield Analysis

Limited information is available to describe this vulnerability.? A single exploit could allow the attacker to cause the affected router to reload, which may result in a DoS condition.? Repeated exploitation could allow an attacker to render a device completely unavailable.

Cisco indicated through CVSS scoring the existence of functional exploit code; however, this exploit code is not known to be publicly available.

 
Vendor Announcements

Cisco has released a security advisory to address Cisco bug ID CSCsl34355 at the following link: cisco-sa-20080924-multicast?

 
Impact

An unauthenticated, remote attacker could exploit this vulnerability to cause a GSR device to reload, which may result in a DoS condition.? Repeated attacks could render a device completely unavailable.

 
Technical Information

The vulnerability exists when Cisco IOS software that is running on a GSR device is configured to process PIM packets.  PIM is not enabled by default and must be enabled for a system to be vulnerable. Cisco IOS software does not properly process malformed PIM requests.  The processing of a malicious request could cause a device to fail and restart.

An unauthenticated, remote attacker could exploit the vulnerability by crafting a malicious PIM request and sending it to an affected system.  When the packet is processed, the system fails to properly handle the request.  An exploit could allow the attacker to cause the affected router to reload, which may result in a DoS condition.

 
Safeguards

Administrators are advised to apply the appropriate update.

Administrators may consider using access control lists (ACLs) to restrict packets that do not originate from authorized sources.?

Administrators may consider allowing only trusted PIM neighbors to access the device.

The Cisco Applied Intelligence team has created the following companion document to guide administrators in identifying and mitigating attempts to exploit this vulnerability prior to applying updated software: cisco-amb-20080924-multicast

 
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.


Signatures
 
Cisco Intrusion Prevention System (IPS) 6.0
Signature IDSignature NameReleaseLatest Release Date
6999/0Cisco PIM Multicast Denial of Service AttackS6202012 Jan 19 
 
Alert History
 

Initial Release



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

Primary Products:
N/A

Associated Products:
CiscoIOS 12.0SY 12.0(32)SY, 12.0(32)SY0a, 12.0(32)SY0b, 12.0(32)SY0c, 12.0(32)SY0d, 12.0(32)SY0e, 12.0(32)SY0f, 12.0(32)SY0g, 12.0(32)SY0h, 12.0(32)SY0i, 12.0(32)SY0j, 12.0(32)SY1, 12.0(32)SY1a, 12.0(32)SY1b, 12.0(32)SY1c, 12.0(32)SY2, 12.0(32)SY2a, 12.0(32)SY2b, 12.0(32)SY2c, 12.0(32)SY2d, 12.0(32)SY2e, 12.0(32)SY2f, 12.0(32)SY2g, 12.0(32)SY2h, 12.0(32)SY3, 12.0(32)SY3a, 12.0(32)SY3b, 12.0(32)SY3c, 12.0(32)SY4, 12.0(32)SY4a, 12.0(32)SY4b, 12.0(32)SY4c, 12.0(32)SY4d | 12.0SYA 12.0(32)SYA




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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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