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Update Protection against Cisco Secure Desktop CSDWebInstaller Code Execution Vulnerability

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Check Point Reference: CPAI-2011-238
Date Published:
Severity:
Source: Secunia Advisory: SA39459
Industry Reference(s): CVE-2011-0926
Protection Provided by: Security Gateway
  • R75
IPS-1
  • IPS-1
  • IPS-1 NGX R65
Who is Vulnerable?
Cisco Systems Secure Desktop 3.5 and prior
Vulnerability Description
A remote code execution vulnerability exists in Cisco Secure Desktop. Cisco Secure Desktop is multipurpose client-side VPN software that is used in a broader enterprise context. This vulnerability may be exploited by remote attackers to execute arbitrary code on the affected system by enticing a user to visit a malicious web page.
Vulnerability Details
The vulnerability is due to a lack of validation of executables downloaded by the Secure Desktop Web CSDWebInstaller.ocx ActiveX control. A remote attacker could trigger this flaw by convincing a victim to open a malicious HTML and executable file that contains a malformed record. This vulnerability may be exploited by remote attackers to execute arbitrary code on the affected system by enticing a user to visit a malicious web page.

Protection Overview
This protection will detect and block the vulnerable ActiveX control.

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 > Application Intelligence > Cisco.
2. In the right pane, double-click the Cisco Secure Desktop CSDWebInstaller Code Execution 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: Cisco Protection Violation
Attack Information: Cisco Secure Desktop CSDWebInstaller code execution

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 Application Intelligence > Badfiles, and select the ActiveX Parser protection group.
3. Click Cisco Secure Desktop CSDWebInstaller Code Execution (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 entries will be logged:

Alert Name: Badfiles ActiveX class in HTML file Alert/Filter
Description: Cisco Secure Desktop CSDWebInstaller Code Execution