MSN Messenger and Windows Live Messenger webcam stream heap overflow

Overview

MSN Messenger fails to properly handle webcam streams, which may allow a remote attacker to execute arbitrary code.

Description

MSN Messenger is an instant messaging application. Starting with version 8, MSN Messenger was renamed to Windows Live Messenger. Windows Live Messenger and some versions of MSN Messenger support the use of webcams. MSN Messenger and Windows Live Messenger appear to require user interaction to connect a webcam stream.

MSN Messenger and Windows Live Messenger contain a heap overflow in the handling of a malformed webcam streams. Exploit code for this vulnerability is publicly available.

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Impact

By convincing a user to accept a webcam invitation, a remote attacker may be able to execute arbitrary code with the privileges of the user.

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Solution

Apply an update
This issue is addressed by Microsoft Security Bulletin MS07-054. This update provides fixed versions of MSN Messenger 6.2, 7.0, 7.5, and Windows Live Messenger 8.0

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Do not accept webcam invitations

If you are unable to install a fixed version, do not accept any webcam invitations, regardless of the source.

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Vendor Information

166521

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Microsoft Corporation Affected

Notified: August 22, 2007 Updated: August 28, 2007

Status

Affected

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

CVSS Metrics

Group	Score	Vector
Base
Temporal
Environmental

References

• <http://secunia.com/advisories/26570/&gt;
• <http://www.microsoft.com/technet/security/bulletin/ms07-054.mspx&gt;

Acknowledgements

This vulnerability was publicly reported by team509.

This document was written by Will Dormann.

Other Information

CVE IDs:	CVE-2007-2931
Severity Metric:	3.54 Date Public: