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VULNERABILITIES - May 14, 2005

1. Yahoo! Chat Add Buddy Without Consent Privacy Issue

Discovered By: Torseq Tech.
Date: Friday, May 13, 2005
Services affected: ALL of Yahoo! Chat
Vendor: Yahoo! Inc.
Proof-of-Concept included: Yes
Fix Available: No (needs fixed server-side)
Description: A vulnerability exists in Yahoo!'s Chat servers that allows for chatters to be added to your friends list completely without their knowledge or permission of the operation. As a result private status messages can be read and online Yahoo! Chat activity can be monitored stealthily.

More details in http://securityfocus.com/archive/1/398168/2005-05-11/2005-05-17/0

2. Yahoo! Messenger URL Handler Remote DoS Vulnerability

Discovered By: Torseq Tech.
Date: Friday, May 13, 2005
Application affected: Yahoo! Messenger ver. 5.x - 6.0 Windows (all builds), *Nix/Mac
? (not tested)
Vendor: Yahoo! Inc.
Proof-of-Concept included: Yes
Fix Available: Yes
Description: A Denial-of-Service attack can be launched against Yahoo! Messenger which can be exploited both locally and remotely through IFRAMEs or by tricking the target into clicking on a YMSGR: URL handler link when in chat or in pm. A remote user can disconnect Yahoo! Messenger users via e-mail or by having the victim visit a web page.

http://securityfocus.com/archive/1/398164/2005-05-11/2005-05-17/0

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