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Vulnerability of Nortel SSL VPN: configuration change trough HTTP interface

Synthesis of the vulnerability 

Some changes can be done when an administration web page is displayed.
Impacted software: Contivity VPN/Gateway, Nortel VPN Router.
Severity of this computer vulnerability: 1/4.
Creation date: 12/12/2005.
Références of this announce: BID-15798, CVE-2005-4197, SA-20051211-0, SEC Consult SA-20051211-0, VIGILANCE-VUL-5422.

Description of the vulnerability 

A "Cross-Site Request Forgery" (XSRF) attack uses only one url to generate an action on the web server. When this url is loaded in the web browser, action is done with rights of connected user.

The Nortel SSL VPN HTTP administration server is not protected against "Cross-Site Request Forgery" attacks.

For example, when user opens following url, or if it is automatically loaded by the web browser, the command is run:
  https://server/tunnelform.yaws?a=command
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This threat announce impacts software or systems such as Contivity VPN/Gateway, Nortel VPN Router.

Our Vigil@nce team determined that the severity of this cybersecurity alert is low.

The trust level is of type confirmed by a trusted third party, with an origin of document.

An attacker with a expert ability can exploit this security alert.

Solutions for this threat 

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