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Secure Elements Class 5 AVR server fails to validate source address of messages

Vulnerability Note VU#919345

Original Release Date: 2006-05-30 | Last Revised: 2006-06-07


The Secure Elements Class 5 AVR server fails to validate the source address of messages it receives. This may allow an attacker to forge messages to the server.


Class 5 AVR

Secure Elements Class 5 AVR (Automated Vulnerability Remediation) is a security product that monitors and enforces security policies on network assets. Class 5 AVR is now known as C5 EVM (Enterprise Vulnerability Management). The Class 5 AVR software includes both server and client components.

Class 5 AVR client

The Class 5 AVR client listens on 60000/udp and an additional tcp port. This client receives commands sent by the Class 5 AVR server.

Class 5 AVR server

The Class 5 AVR server is available as an appliance or as software that runs on commodity hardware. The Class 5 AVR server contains information about network assets, vulnerabilities, and remediation history.

The problem

The Class 5 AVR server fails to validate the source address of messages it receives.


A remote, unauthenticated attacker may be able to forge client messages. This can allow an attacker to intercept communications initiated by the server. An attacker may also be able to alter the client information stored by the server.


Upgrade or patch
This issue has been resolved in C5 EVM 2.8.1.

Vendor Information

Affected   Unknown   Unaffected

Secure Elements

Notified:  February 06, 2006 Updated:  May 30, 2006



Vendor Statement

Remediation in C5 EVM version 2.8.1 and above

C5 EVM Sensor registrations are invalidated by the C5 EVM Server when the IP addresses of the Sensor registration request and corresponding Sensor survey do not match.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

CVSS Metrics

Group Score Vector
Base N/A N/A
Temporal N/A N/A
Environmental N/A



Thanks to the NOAA N-CIRT Lab for reporting this vulnerability.

This document was written by Will Dormann.

Other Information

CVE IDs: None
Severity Metric: 0.87
Date Public: 2006-05-30
Date First Published: 2006-05-30
Date Last Updated: 2006-06-07 03:00 UTC
Document Revision: 6

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