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General discussion

Vulnerability in Jason Maloney Guestbook

Dec 6, 2003 3:24AM PST
Jason Maloney Guestbook Input Validation Flaw Permits Remote Cross-Site Scripting Attacks

Impact: Disclosure of authentication information, Disclosure of user information, Execution of arbitrary code via network, Modification of user information
Exploit Included: Yes
Version(s): 3.0

Description: An input validation vulnerability was reported in Jason Maloney's Guestbook. A remote user can conduct cross-site scripting attacks.

It is reported that the software does not properly validate user-supplied input in several variables, such as the 'name' variable. A remote user can submit a message with a specially crafted name field. Then, when a target user views the message, arbitrary scripting code will be executed by the target user's browser. The code will originate from the site running the vulnerable Guestbook software and will run in the security context of that site. As a result, the code will be able to access the target user's cookies (including authentication cookies), if any, associated with the site, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.

Impact: A remote user can access the target user's cookies (including authentication cookies), if any, associated with the site running the vulnerable Guestbook software, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.

Solution: No solution was available at the time of this entry.

An unofficial patch is described in the Source Message.

Vendor URL: www.aestheticsurgerycenter.com/scripts/guestbook/
Cause: Input validation error
Underlying OS: Linux (Any), UNIX (Any), Windows (Any)
Reported By: Shaun Colley

http://www.securitytracker.com/alerts/2003/Dec/1008408.html

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