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Vulnerability Alert

Mozilla Firefox Just-In-Time JavaScript Parsing Arbitrary Code Execution Vulnerability

 
Threat Type:CWE-94: Code Injection
IntelliShield ID:18647
Version:3
First Published:2009 July 14 15:29 GMT
Last Published:2009 July 17 16:31 GMT
Port: Not available
CVE:CVE-2009-2477
BugTraq ID:35660
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Moderate Damage
CVSS Base:9.3 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:7.3
 
Version Summary:

Mozilla has released a security advisory and updated software to address the Mozilla Firefox just-in-time JavaScript parsing arbitrary code execution vulnerability.

 
 
Description

Mozilla Firefox version 3.5 contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code.

The vulnerability is due to an error in the just-in-time (JIT) JavaScript compiler used by the TraceMonkey JavaScript engine when processing HTML elements.  An unauthenticated, remote attacker could exploit the vulnerability by convincing a user to visit a malicious website.  A successful exploit could allow the attacker to execute arbitrary code with the privileges of the user.

Proof-of-concept code to exploit the vulnerability is publicly available.

Mozilla has confirmed the vulnerability and released updated software.

 
Warning Indicators

Mozilla Firefox version 3.5 is vulnerable.

 
IntelliShield Analysis

Limited information is available to describe this vulnerability.? To exploit the vulnerability, an attacker must convince a user to visit a malicious web page.? The attacker will likely employ social engineering to exploit the vulnerability, such as supplying links to the website in an e-mail message or another form of messaging.

An exploit could allow an unauthenticated, remote attacker to execute arbitrary code with the privileges of the user running Mozilla Firefox.? If the user holds Administrator privileges, an exploit could result in complete system compromise.

 
Vendor Announcements

Mozilla has released a security advisory at the following link: MFSA 2009-41

US-CERT has released a vulnerability note at the following link: VU#443060

 
Impact

An unauthenticated, remote attacker could exploit this vulnerability to execute arbitrary code with the privileges of the user.? If the user holds elevated privileges, the attacker could execute code that results in a complete system compromise.

 
Technical Information

The vulnerability exists when the application returns from a native function such as escape().  Upon this return, the JIT compiler could fall into a corrupt state.

An unauthenticated, remote attacker could exploit this vulnerability to execute arbitrary code with user privileges.

 
Safeguards

Administrators are advised to apply the appropriate updates.

Users are advised not to follow unsolicited links.  Users should verify the authenticity of unexpected links prior to following them.

Users are advised not to open e-mail messages from untrusted sources.

Administrators are advised to monitor affected systems.

Users may disable the just-in-time JavaScript compiler by running Mozilla Firefox in safe mode or by setting the javascript.options.jit.content value to false through the about:config interface.

 
Patches/Software

Mozilla has released updated software at the following link: Mozilla Firefox 3.5.1


Signatures
 
Cisco Intrusion Prevention System (IPS) 6.0
Signature IDSignature NameReleaseLatest Release Date
19600/0Firefox 3.5 Malformed HTML VulnerabilityS4152009 Jul 15 
19600/1Mozilla Firefox Just-In-Time JavaScript Parsing Arbitrary Code Execution VulnerabilityS5612011 Apr 22 
 
Alert History
 

Version 2, July 15, 2009, 12:06 PM: Mozilla has released a security notice and provided workarounds to address the just-in-time JavaScript parsing arbitrary code execution vulnerability.  US-CERT has released a vulnerability note.

Version 1, July 14, 2009, 11:29 AM: Mozilla Firefox contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code.  Updates are unavailable.



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

Primary Products:
Mozilla FoundationFirefox 3.5 .0

Associated Products:
N/A




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