LISTSERV 'SHOWTPL' Parameter Cross Site Scripting Vulnerability

Bugtraq ID:	55082
Class:	Input Validation Error
CVE:
Remote:	Yes
Local:	No
Published:	Aug 17 2012 12:00AM
Updated:	Aug 17 2012 12:00AM
Credit:	Jose Carlos de Arriba
Vulnerable:	L-Soft Listserv 16
Not Vulnerable:

LISTSERV 'SHOWTPL' Parameter Cross Site Scripting Vulnerability

LISTSERV is prone to a cross-site scripting vulnerability because it fails to properly sanitize user-supplied input.

An attacker may leverage this issue to execute arbitrary script code in the browser of an unsuspecting user in the context of the affected site. This may let the attacker steal cookie-based authentication credentials and launch other attacks.

LISTSERV 16 is vulnerable; other versions may also be affected.

LISTSERV 'SHOWTPL' Parameter Cross Site Scripting Vulnerability

Attackers can exploit this issue by enticing an unsuspecting user to follow a malicious URI.

The following example URI is available:

http://www.example.com/SCRIPTS/WA.EXE?SHOWTPL=<script>alert(document.cookie)</script>

LISTSERV 'SHOWTPL' Parameter Cross Site Scripting Vulnerability

Solution:
Updates are available. Please see the references for more information.

LISTSERV 'SHOWTPL' Parameter Cross Site Scripting Vulnerability

References:

• Listserv Product Home Page (L-Soft)