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Update Protection against Apple CUPS IPP Use-after-free Memory Corruption Vulnerability

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Check Point Reference: CPAI-2011-091
Date Published:
Severity:
Last Updated:
Source: Secunia Advisory: SA42219
Industry Reference(s): CVE-2010-2941
Protection Provided by: Security Gateway
  • R75
IPS-1
  • IPS-1
  • IPS-1 NGX R65
Who is Vulnerable?
Apple Computer Common UNIX Printing System (CUPS) 1.4.4 and prior
Vulnerability Description
A use-after-free memory corruption vulnerability has been reported in the implementation of Internet Printing Protocol (IPP) of the Common Unix Printing System (CUPS). CUPS is a modular printing system for Unix-like operating systems that allows a computer to act as a print server. A computer running CUPS is a host that can accept print jobs from client computers, process them, and send them to the appropriate printer. A remote attacker may exploit this vulnerability to execute arbitrary code on a vulnerable system.
Update/Patch Available
The vendor, Red Hat, has released an advisory addressing this vulnerability.
Vulnerability Details
This vulnerability is caused by improper handling of memory allocations and deallocations for multiple-valued attributes that have their values typed differently. A remote attacker can exploit this issue by specially crafting a request to a CUPS server using the IPP protocol. Successful exploitation of this vulnerability can result in execution of arbitrary code on the vulnerable system and may result in a denial of service condition.

Protection Overview
This protection will detect and block malicious CUPS requests sent to the vulnerable system.

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 > Application Servers.
2. In the right pane, double-click the Apple CUPS IPP Use-after-free 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: Application Servers Protection Violation 
Attack Information: Apple CUPS IPP Use-after-free memory corruption

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 Web Intelligence > WWW 2, and select the CGI Attacks protection group.
3. Click Apple CUPS IPP Use-after-free Memory Corruption (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: WWW/CGI Attacks Protection Group
Description: Apple CUPS IPP Use-after-free Memory Corruption