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Secure Elements Class 5 AVR client fails to enforce integrity of message digests

Vulnerability Note VU#353769

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


The Secure Elements Class 5 AVR client fails to enforce integrity of message digests. This may allow an attacker to replay modified messages to a vulnerable client.


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 client does not enforce the integrity of message digests.


A remote attacker may be able to modify and replay messages to a vulnerable client.


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

Vendor Information


Secure Elements Affected

Notified:  February 06, 2006 Updated: May 26, 2006



Vendor Statement

Remediation in C5 EVM version 2.8.1 and above

The C5 EVM Sensor now calculates the digest of incoming messages; rejecting any messages that do not match the digest provided by the sender.

Vendor Information

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

CVSS Metrics

Group Score Vector



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: 0.35
Date Public: 2006-05-30
Date First Published: 2006-05-30
Date Last Updated: 2006-06-07 02:48 UTC
Document Revision: 6

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