TITLE:
Nortel SSL VPN Web Interface Arbitrary Command Execution
Vulnerability

SECUNIA ADVISORY ID:
SA17974

VERIFY ADVISORY:
http://secunia.com/advisories/17974/

CRITICAL:
Moderately critical

IMPACT:
Cross Site Scripting, System access

WHERE:
>From remote

OPERATING SYSTEM:
Nortel Alteon SSL VPN
http://secunia.com/product/2436/

DESCRIPTION:
Daniel Fabian has reported a vulnerability in Nortel SSL VPN, which
can be exploited by malicious people to  conduct cross-site scripting
attacks and potentially to compromise a user's system.

Input passed to the "a" parameter in "tunnelform.yaws" of the web
interface isn't properly sanitised before being returned to the user.
This can be exploited to execute arbitrary HTML and script code in a
user's browser session in context of an affected site. 

It is reportedly possible to execute arbitrary commands on the user's
browser by making use of the cryptographically signed Java Applet that
is loaded by the web pages, and supplying the commands via a malicious
link.

Successful exploitation requires that the user is e.g. tricked into
following a malicious link and to logon to the web interface of the
VPN after following the link.

The vulnerability has been reported in version 4.2.1.6. Prior
versions may also be affected.

SOLUTION:
The vulnerability has reportedly been fixed in release v5.1.5.

PROVIDED AND/OR DISCOVERED BY:
Daniel Fabian, SEC-CONSULT

ORIGINAL ADVISORY:
SEC-CONSULT:
http://www.sec-consult.com/247.html

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