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Research > Zero-Day Tracker > 20070131

MSN Messenger Video Conversation Heap Overflow

Date Disclosed:
1/31/2007

Date Patched:
01.31.2007

Vendor:
Microsoft

Affected Software:
MSN Messenger 6.x
MSN Messenger 7.x
MSN Messenger 8.0.x (not confirmed yet)

Description:
A zero-day vulnerability has been publicly documented. This vulnerability lies in the MSN Messenger Webcam component. If an attacker is able to convince a victim to accept an incoming Webcam request, the attacker is then able to run code upon that remote victims host. However, do to the nature of this vulnerability, an attacker is only able to leverage it against victims that accept the webcam request.

Severity:
High

Code Execution:
Yes

Impact:
Arbitrary code execution under the context of the logged in user
Although this vulnerability has a high impact, because of the level of interaction needed by a victim to accept a webcam invite, the impact will be somewhat limited. A more critical scenario is generated when clients are running with administrator-level privileges on their local hosts, which would run the malicious payload with Administrator credentials.

Mitigation:
At this moment, the best form of mitigation is to upgrade MSN Messengers to MSN Messenger Live (version 8.1 or later).

Administrators can block Webcam connections by disabling TCP/1863 at the firewall, which will disable all MSN Video support.

Protection:
eEye's Blink® Personal Edition protects from this vulnerability.
eEye's Blink® Professional Edition protects from this vulnerability.
eEye's Retina® Network Security Scanner scans devices to detect for this vulnerability.

Patch:
Windows Live Messenger 8.1

Links:
Original Vulnerability Disclosure
CVE-2007-4579
MS07-054

Status:
1/31/2007: Vulnerability / Reproduction Details Released
9/11/2007: MS07-054 Released From Microsoft

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