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Update Protection against Mozilla Firefox ConstructFrame With Floating First-letter Memory Corruption

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Check Point Reference: CPAI-2009-409
Date Published:
Severity:
Last Updated:
Source: Secunia Advisory: SA35914
Industry Reference(s): CVE-2009-2462
Protection Provided by: Security Gateway
  • R75
Who is Vulnerable?
Mozilla Foundation Firefox Prior to 3.0.12
Vulnerability Description
Mozilla Firefox is a web browser developed by Mozilla Foundation. The browser is capable of interpreting and rendering many types of content published on the Internet, including various versions of HTML, XML, XUL, JavaScript, various graphics formats, and so on. The browser runs on the Windows, Macintosh, Unix and Linux based platforms.
Vulnerability Details
A memory corruption vulnerability is reported in Mozilla Firefox web browser. The vulnerability is due to an implementation error when handling the first letter frame. A remote attacker can exploit this vulnerability by enticing the target user to open a malicious web page.
In an attack scenario, where arbitrary code is injected and executed on the target system, the behaviour of the target is dependent on the intention of the malicious code. The injected code will be run with privileges of the currently logged on user.
If such an attack is not executed successfully, the vulnerable application may terminate as a result of invalid memory access.

Protection Overview
This protection will detect and block attempts to exploit this vulnerability.

In order for the protection to be activated, update your Security Gateway product to the latest IPS update. For information on how to update IPS, go to SBP-2006-05, Protection tab and select the version of your choice.

To configure the defense, select your product from the list below and follow the related protection steps.

Security Gateway R75

How Can I Protect My Network?
1. In the IPS tab, click Protections > By Protocol > IPS Software Blade > Web Intelligence > HTTP Client Protections > Mozilla Firefox Vulnerabilities.
2. In the right pane, double-click the Mozilla Firefox ConstructFrame With Floating First-letter Memory Corruption protection.
3. In the Protection Details window, click on Edit. Choose the protection's Action (Override IPS Policy with: Prevent/Detect), and apply Additional Settings.
4. Install policy on all modules.

How Do I Know if My Network is Under Attack?
SmartView Tracker will log the following entries:

Attack Name: Web Client Enforcement Violation
Attack Information: Mozilla Firefox ConstructFrame with floating first-letter memory corruption