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TITLE:
Yahoo Messenger Contact Details Script Execution Vulnerability

SECUNIA ADVISORY ID:
SA23928

VERIFY ADVISORY:
http://secunia.com/advisories/23928/

CRITICAL:
Less critical

IMPACT:
System access

WHERE:
>From remote

SOFTWARE:
Yahoo! Messenger 8.x
http://secunia.com/product/12122/

DESCRIPTION:
Hai Nam Luke has discovered a vulnerability in Yahoo Messenger, which
potentially can be exploited by malicious users to compromise a user's
system.

Input passed to the "First Name", "Last Name", and "Nickname" fields
in the "Contact Details" option is not properly sanitised when
displaying status notification messages to the user in a chat box.
This can e.g. be exploited to execute a limited amount of arbitrary
script code in the Local Zone (My Computer) context by inputting
specially crafted image tags in the aforementioned fields, tricking a
target user into adding the attacker to the messenger list, sending a
message to the target user, and then changing the status e.g. from
"Available" to "Invisible To Everyone".

Successful exploitation requires that the attacker is in the
messenger list of the target.

NOTE: When a user adds another user to the messenger list, the
contact details get truncated, which limits the amount of script code
that can be inserted.

The vulnerability is confirmed in version 8.1.0.209. Other versions
may also be affected.

SOLUTION:
Add only trusted users to the messenger list.

PROVIDED AND/OR DISCOVERED BY:
Hai Nam Luke

ORIGINAL ADVISORY:
http://archives.neohapsis.com/archives/bugtraq/2007-01/0613.html

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