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Security Activity Bulletin

Mozilla Firefox Unicode Characters Remote Buffer Overflow Vulnerability

 
Threat Type:IntelliShield: Applied Mitigation Bulletin
IntelliShield ID:18660
Version:2
First Published:2009 July 16 01:36 GMT
Last Published:2009 July 20 14:44 GMT
Port: Not available
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Harassment
Related Resources:
View related IPS Signature
 
 
Version Summary:

Mozilla has confirmed the Firefox Unicode characters remote buffer overflow vulnerability can be exploited to cause a DoS condition.  It is not exploitable for code execution.  Updates are not available.

 

Description
 

Mozilla Firefox versions 3.5 and 3.5.1 contain a vulnerability that could allow an unauthenticated, remote attacker to cause the affected software to crash.

The vulnerability is due to a lack of bounds checking when the application handles Unicode characters.  An unauthenticated, remote attacker could exploit this vulnerability by creating a malicious web page that contains crafted Unicode characters.  By convincing a user to visit the page, the attacker could cause a stack-based buffer overflow that is not exploitable for code execution.  An exploit could cause the application to crash.

Exploit code is publicly available which can crash the affected browser.

Mozilla has confirmed this vulnerability; however, software updates are not available.


Signatures
 
Cisco Intrusion Prevention System (IPS) 6.0
Signature IDSignature NameReleaseLatest Release Date
19639/0Firefox 3.5 Unicode Buffer OverflowS4162009 Jul 16 
 
Alert History
 

Version 1, July 15, 2009, 9:36 PM: ?Mozilla Firefox contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code with the privileges of the user.? Updates are not available.



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

Primary Products:
Mozilla FoundationFirefox 3.5 .0, .1

Associated Products:
N/A




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