Check Point Advisories

Skype URI Handling Buffer Overflow (CVE-2005-3265)

Vulnerability
Protection

Check Point Reference:	CPAI-2005-319
Date Published:	28 Mar 2010
Severity:	Medium
Last Updated:	Sunday 28 March, 2010
Source:
Industry Reference:	CVE-2005-3265
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. There exists a buffer overflow vulnerability in the Skype product. The flaw is caused by insufficient boundary checks when handling Skype-specific URI schemes. By persuading a target user to follow malicious links, a remote attacker may inject and execute arbitrary code on the target system. In an attack case where a malicious user is successful in injecting and executing supplied code, the behavior of the system is dependent on the nature of the injected code. Any code injected into the vulnerable component will execute in the security context of the current logged in user. In a simple attack case aimed at creating a denial of service condition, the affected application will terminate.

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 URI Handling Buffer Overflow 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 URI handling buffer overflow