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Vulnerability Alert

Cisco IOS Firewall Application Inspection Control Denial of Service Vulnerability

 
Threat Type:CWE-399: Resource Management Errors
IntelliShield ID:16661
Version:1
First Published:2008 September 24 18:22 GMT
Last Published:2008 September 24 18:22 GMT
Port: 80
CVE:CVE-2008-3812
BugTraq ID:31354
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:7.8 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:6.4
Related Resources:
View related Security AdvisoryView related IPS Signature
 
 
Version Summary:

Cisco IOS Software contains a vulnerability in the Cisco IOS Firewall Application Inspection Control feature that could allow an unauthenticated, remote attacker to case a denial of service condition.  Updated software is available.

 
 
Description

Cisco IOS Software contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial or service (DoS) condition.

The vulnerability exists due to an error by the Cisco IOS Firewall Application Inspection Control (AIC) feature.  An unauthenticated, remote attacker could exploit this vulnerability by sending malicious HTTP packets to the target device.  The packets could cause the target device to reload.

Exploit code exists.

Cisco has confirmed this vulnerability and released updated software.

 
Warning Indicators

Cisco has published a list of affected Cisco IOS products in the security advisory.

 
IntelliShield Analysis

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

This vulnerability requires a specific configuration to be used for an exploit to be successful.  This configuration may not be common in most environments, limiting the attacker's ability to exploit this vulnerability.

 
Vendor Announcements
Cisco has released a security advisory for Cisco bug ID CSCsh12480 at the following link: cisco-sa-20080924-iosfw
 
Impact

An unauthenticated, remote attacker could exploit this vulnerability to cause the target device to reload.  Repeated exploitation could result in a persistent DoS condition.

 
Technical Information

The vulnerability affects systems that are configured to run Cisco IOS Firewall AIC with policies configured for specific applications.  An unauthenticated, remote attacker could exploit this vulnerability by sending malicious HTTP transit packets to the target device after a valid TCP three-way handshake occurs.  The packets could cause the target device to reload.

 
Safeguards

Administrators are advised to apply the appropriate updates.

Administrators may consider disabling AIC HTTP deep packet inspection until a patch can be applied.

Administrators are advised to monitor affected systems for signs of exploitation.

 
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
6989/0IOSFW HTTP Inspection VulnerabilityS3582008 Sep 24 
 
Alert History
 

Initial Release



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

Primary Products:
N/A

Associated Products:
CiscoIOS 12.4T 12.4(9)T, 12.4(9)T0a, 12.4(9)T1, 12.4(9)T2, 12.4(9)T3, 12.4(9)T4, 12.4(9)T5, 12.4(9)T6, 12.4(11)T, 12.4(11)T1, 12.4(11)T2, 12.4(11)T3 | 12.4XE 12.4(6)XE, 12.4(6)XE1, 12.4(6)XE2, 12.4(6)XE3 | 12.4XJ 12.4(11)XJ, 12.4(11)XJ1, 12.4(11)XJ2, 12.4(11)XJ3, 12.4(11)XJ4 | 12.4XK 12.4(14)XK | 12.4XV 12.4(11)XV, 12.4(11)XV1 | 12.4XW 12.4(11)XW




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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