Check Point Advisories

Outlook Express and Windows Mail NNTP Handling Code Execution (MS07-056; CVE-2007-3897)

Check Point Reference: CPAI-2007-328
Date Published: 20 Dec 2009
Severity: High
Last Updated: 14 Feb 2016
Industry Reference:CVE-2007-3897
Protection Provided by:

Security Gateway
R80, R77, R76, R75

Who is Vulnerable?
Vulnerability Description Network News Transfer Protocol (NNTP) is an open standard designed for the distribution, enquiry, retrieval, and posting of news articles using a reliable stream-based transmission over the Internet. It is the core protocol of the newsgroup service. The most commonly used communication end point for NNTP is TCP port 119.There is a buffer overflow vulnerability exists in Microsoft Outlook Express and Windows Mail. Specifically the vulnerability is due to lack of boundary checks when processing news subjects from the NNTP server. Successful exploitation would allow the attacker to execute arbitrary code on the vulnerable client system, in the context of the logged in user.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, Microsoft Outlook Express and/or Windows Mail will terminate unexpectedly.

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 / R76 / R75

  1. In the IPS tab, click Protections and find the Outlook Express and Windows Mail NNTP Handling Code Execution (MS07-056) protection using the Search tool and Edit the protection's settings.
  2. Install policy on all modules.

This protection's log will contain the following information:

Attack Name:  Mail Client Protection Violation
Attack Information:  Microsoft Outlook Express and Windows Mail NNTP handling code execution (MS07-056)

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