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Secunia Security Advisory 23928

Secunia Security Advisory 23928
Posted Jan 31, 2007
Authored by Secunia | Site secunia.com

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

tags | advisory
SHA-256 | 63cf4ee827317a4f9918136dc392e423a4efe2ffc181b9bc8e01976438d618c6

Secunia Security Advisory 23928

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Secunia is proud to announce the availability of the Secunia Software
Inspector.

The Secunia Software Inspector is a free service that detects insecure
versions of software that you may have installed in your system. When
insecure versions are detected, the Secunia Software Inspector also
provides thorough guidelines for updating the software to the latest
secure version from the vendor.

Try it out online:
http://secunia.com/software_inspector/

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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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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
http://secunia.com/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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