Vulnerability Note VU#952875

Yahoo! Messenger is vulnerable to DoS via multiple messages from spoofed names

Overview

Yahoo! Messenger is an instant messaging client. A report indicates that there is a vulnerability that permits an attacker to spoof the source user name of a Yahoo! Messenger message.

I. Description

Yahoo! Messenger permits a user to place users on an ignore list. A vulnerability exists that permits users to spoof their source user names on messages. This permits users who have been ignored to continue to send messages to their victim user.

II. Impact

This vulnerability could be used in a mass messaging attack that could lead to the denial of service of a client.

III. Solution

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

Systems Affected

Vendor	Status	Date Updated
Yahoo	Vulnerable	5-Jun-2002

References

http://online.securityfocus.com/archive/1/257584
http://www.iss.net/security_center/static/8267.php
http://www.securityfocus.com/bid/4164

Credit

This vulnerablity was discovered by Scott Woodward <scott@phoenixtechie.com>.

This document was written by Jason Rafail.

Other Information

Date Public	02/21/2002
Date First Published	06/05/2002 02:15:28 PM
Date Last Updated	06/05/2002
CERT Advisory	CA-2002-16
CVE Name	CAN-2002-0321
Metric	3.19
Document Revision	14

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