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Update Protection against Mozilla Network Security Services Regexp Heap Overflow Vulnerability

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Check Point Reference: CPAI-2009-165
Date Published:
Severity:
Source: Mozilla Foundation Security Advisory 2009-43
Industry Reference(s): CVE-2009-2404
Protection Provided by: Security Gateway
  • R70
VPN-1
  • NGX R65
VSX
  • NGX R65
IPS-1
  • IPS-1
  • IPS-1 NGX R65
Who is Vulnerable?
Mozilla Foundation Network Security Services Prior to 3.12.3
Vulnerability Description
A remote code execution vulnerability has been reported within Mozilla Network Security Services. Network Security Services (NSS) is a set of libraries designed to support cross-platform development of security-enabled client and server applications. it is used by applications such as Mozilla Firefox and Mozilla Thunderbird. A remote attacker could exploit this flaw to execute arbitrary code on a vulnerable system.
Update/Patch Available
Apply patch:
Red Hat Bugzilla – Bug 512912
Vulnerability Details
The vulnerability is due to a heap buffer overflow in NSS when handling malformed certificates with a crafted Common Name (CN) field. A remote attacker can exploit this flaw by sending a malicious certificate to a vulnerable system. Successful exploitation of this issue could result in execution of arbitrary code on the vulnerable system.

Protection Overview
This protection will detect and block malicious certificates that contain a crafted Common Name.

In order for the protection to be activated, update your Security Gateway/VPN-1 product to the latest IPS/SmartDefense update. For information on how to update IPS/SmartDefense, 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 R70

How Can I Protect My Network?
1. In the IPS tab, click Protections > By Protocol > Web Intelligence > HTTP Client Protections.
2. In the right pane, double-click the Mozilla Network Security Services Regexp Heap Overflow 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: Invalid SSL Packet
Attack Information: Mozilla Network Security Services regexp heap overflow

VPN-1 NGX R65

How Can I Protect My Network?
1. In the SmartDefense tab, click Web Intelligence > HTTP Client Protections.
2. Select the following protection:

Mozilla Network Security Services Regexp Heap Overflow

3. In the configuration pane, under Settings > Mode, check Active.
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: Invalid SSL Packet
Attack Information: Mozilla Network Security Services regexp heap overflow

VPN-1 VSX NGX R65

How Can I Protect My Network?
1. In the SmartDefense tab, click Web Intelligence > HTTP Client Protections.
2. Select the following protection:

Mozilla Network Security Services Regexp Heap Overflow

3. In the configuration pane, under Settings > Mode, check Active.
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: Invalid SSL Packet
Attack Information: Mozilla Network Security Services regexp heap overflow

IPS-1 & IPS-1 NGX R65

How Can I Protect My Network?
1. In the IPS-1 Policy Manager, click on the Protection tab.
2. In the Protection tree, click Intelligence > SSL, and select the SSLv3/TLS Server Hello protection group.
3. Click SSL Certificate Man-In-The-Middle Attack (IPS-1 NGX R65 only).
4. In the configuration pane, under Settings, check Active.
5. Click on Install Policy.

How Do I Know if My Network is Under Attack?
Upon attack, the following entry will be logged:

Alert Name: SSLv3/TLS Server Hello
Description: SSL Certificate Man-In-The-Middle Attack