Rule:

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Sid:
2128

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Summary:
This event is generated when an attempt is made to access srsrv.cgi on a web server. This may indicate an attempt to exploit a cross-site scripting vulnerability that affects Neoteris Instant Virtual Extranet, an appliance-based VPN solution.

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Impact:
Arbitrary code execution, possible session hijack.

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Detailed Information:
This event indicates that an attempt has been made to exploit a cross-site scripting vulnerability in Neoteris Instant Virtual Extranet. An attacker can pass an argument to srsrv.cgi that bypasses 
authentication, and can allow the attacker to hijack a legitimate user's VPN session. 

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Affected Systems:
Neoteris Instant Virtual Extranet 3.01 and earlier.

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Attack Scenarios:
An attacker can pass a specific argument to srsrv.cgi that bypasses authentication and can hijack a legitimate user's VPN session.

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Ease of Attack:
Simple. 

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False Positives:
None known.

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False Negatives:
None known.

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Corrective Action:
Apply the patch provided by Neoteris (https://support.neoteris.com).

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Contributors:
Sourcefire Vulnerability Research Team
Brian Caswell <bmc@sourcefire.com>
Nigel Houghton <nigel.houghton@sourcefire.com>
Sourcefire Technical Publications Team

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Additional References:

CVE
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0217

Nessus
http://cgi.nessus.org/plugins/dump.php3?id=11608

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