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Vulnerability Alert

Cisco Linksys WRT54GC HTTP String Parsing Remote Buffer Overflow Vulnerability

 
Threat Type:CWE-119: Buffer Errors
IntelliShield ID:22228
Version:2
First Published:2011 January 13 21:24 GMT
Last Published:2011 January 14 17:39 GMT
Port: Not available
CVE:CVE-2011-0352
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 has updated this alert to correct the attribution of thanks to the reporter of this vulnerability, as well as to assign a CVE name.

 
 
Description

Cisco Linksys WRT54GC firmware versions prior to 1.06.1 contain a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition.

The vulnerability is due to insufficient boundary restrictions on strings in HTTP POST requests processed by the device's web-based management interface.  An unauthenticated, remote attacker could exploit the vulnerability by sending malicious HTTP requests to the device.  If successful, the attacker could cause the device to stop responding, resulting in a DoS condition.

Exploit code is available.

Cisco confirmed the vulnerability and released firmware updates.

 
Warning Indicators

Cisco Linksys WRT54GC firmware versions prior to 1.06.1 are vulnerable.

 
IntelliShield Analysis

To exploit the vulnerability, the attacker must be able to send malicious HTTP requests to the device on an internal interface.  The attacker may require access to internal networks to accomplish this goal, making exploitation more difficult.

Exploit code that results in a DoS condition is available.  Although theoretically possible with a buffer overflow vulnerability of this type, code execution has not been proven in available technical details or exploit code.

 
Vendor Announcements
Cisco thanks Yuji Ukai of Fourteenforty Research Institute, Inc. for reporting this vulnerability.
 
Impact

An unauthenticated, remote attacker could exploit this vulnerability to cause a targeted device to stop responding, resulting in a DoS condition.

 
Technical Information

The vulnerability is due to insufficient boundary restrictions on strings in HTTP POST requests processed by the device's web-based management interface.

An unauthenticated, remote attacker could exploit the vulnerability by sending malicious HTTP POST requests that contain overly large string values to the device.  When processed, the request could cause a buffer overflow condition.  The resulting memory error may cause the device to stop responding, resulting in a DoS condition.

 
Safeguards

Administrators are advised to apply the available firmware updates.

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 critical systems.

 
Patches/Software

Cisco has released updated firmware at the following direct-download link: WRT54GCv1_US_FW_1.06.1.ZIP

 
Alert History
 

Version 1, January 13, 2011, 4:24 PM: Cisco Linksys WRT54GC devices contain a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition.  Updates are available.



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

Primary Products:
LinksysWRT54GC Router Firmware (Version 1.0) 1.06 Base

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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