Vulnerability Note VU#887319

Yahoo! Messenger contains buffer overflow in "IMvironment" field

Original Release date: 05 Jun 2002 | Last revised: 24 Oct 2002


Yahoo! Messenger is an instant messaging client. There is a remotely exploitable buffer overflow vulnerability in the "imv" field of Yahoo! Messenger.


A remotely exploitable buffer overflow exists in the "imv" field that may permit a remote attacker to execute arbitrary code on the system with the privileges of the current user. It is also possible to crash the Yahoo! Messenger client by overflowing the "imv" field.


A denial of service situation is caused. However, this vulnerability is a buffer overflow, and may potentially allow the execution of arbitrary code on the local system with the privileges of the current user.

It should be noted that the attacker needs to use a custom client in order to exploit this vulnerability.


This vulnerability was resolved in version 5,0,0,1058.

The Yahoo! Messenger client communicates via port 5101 for peer to peer connections. Disabling the client, or blocking access to this port via a firewall may mitigate this attack.

Systems Affected (Learn More)

VendorStatusDate NotifiedDate Updated
YahooAffected29 May 200205 Jun 2002
If you are a vendor and your product is affected, let us know.

CVSS Metrics (Learn More)

Group Score Vector
Base N/A N/A
Temporal N/A N/A
Environmental N/A N/A



This vulnerablity was discovered by Scott Woodward.

This document was written by Jason Rafail.

Other Information

  • CVE IDs: CAN-2002-0320
  • CERT Advisory: CA-2002-16
  • Date Public: 21 Feb 2002
  • Date First Published: 05 Jun 2002
  • Date Last Updated: 24 Oct 2002
  • Severity Metric: 3.37
  • Document Revision: 10


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