Check Point Advisories

Skype skype4com URI Handler Remote Heap Corruption (CVE-2007-5989)

Vulnerability
Protection

Check Point Reference:	CPAI-2007-356
Date Published:	1 Oct 2009
Severity:	High
Last Updated:	Thursday 01 October, 2009
Source:
Industry Reference:	CVE-2007-5989
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description	Skype is a peer-to-peer Voice over IP (VoIP) Internet telephony network solution. The product is used to transfer real time conversations between two peers over the Internet. Skype users can speak to other Skype users, receive calls from traditional phones, and receive voice-mail messages. Peers are identified by Internet addresses as opposed to phone numbers in the traditional phone system. There exists a heap corruption vulnerability in Skype application. The vulnerability is due to a boundary error when processing crafted URL parameters. An attacker could exploit this vulnerability by enticing target user to visit malicious web pages. Successful exploitation would allow for arbitrary code injection and execution with the privileges of the logged-in user privileges. An attack targeting this vulnerability can result in the injection and execution of arbitrary code. If code execution is successful, the behaviour of the target will depend on the intention of the attacker. Any injected code will be executed within the security context of the currently logged in user. In the case of an unsuccessful code execution attack, the web browser using the vulnerable application may terminate abnormally.

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, click on Protection tab and select the version of your choice.

Security Gateway R80 / R77 / R75

In the IPS tab, click Protections and find the Skype skype4com URI Handler Remote Heap Corruption protection using the Search tool and Edit the protection's settings.
Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name: Instant Messenger.
Attack Information: Skype skype4com URI handler remote heap corruption