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Ethereal fails to properly parse NetFlow UDP packets with an overly large template_entry count

Vulnerability Note VU#644886

Original Release Date: 2004-03-24 | Last Revised: 2004-03-25

Overview

Ethereal fails to properly parse v9_template structures in NetFlow UDP packets with an overly large template_entry count. This could allow an attacker to execute arbitrary code.

Description

Ethereal is a network traffic analysis package. It includes the ability to decode packets containing NetFlow data. There is a buffer overflow vulnerability in the way the NetFlow v9 dissector parses v9_template structures in a NetFlow UDP packet. A remote, unauthenticated attacker could exploit this vulnerability by sending a NetFlow UDP packet containing an overly large template_entry count which could allow for arbitrary code execution.

Impact

A remote, unauthenticated attacker could execute arbitrary code on the vulnerable system.

Solution

Upgrade

Upgrade to version 0.10.3 or later.

Note: Ethereal is considered BETA software at this time.


Disable Dissector

If you are unable to upgrade to version 0.10.3 or later, you can disable the NetFlow protocol dissector by performing the following actions in Ethereal:

(for Ethereal versions 0.9.x)
1) Select Edit->Protocols
2) Deselect the NetFlow protocol dissector from the list

(for Ethereal versions 0.10.x)
1) Select Analyze->Enabled Protocols
2) Disable the CFLOW (Cisco NetFlow) protocol dissector from the list by unchecking its "Status" checkbox

However, it is strongly encouraged to upgrade to version 0.10.3 or later.

Vendor Information

644886
Expand all

Ethereal

Updated:  March 24, 2004

Status

  Vulnerable

Vendor Statement

Please see the Ethereal Security Bulletin at http://www.ethereal.com/appnotes/enpa-sa-00013.html.

Vendor Information

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

Addendum

The CERT/CC has no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.


CVSS Metrics

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

References

Credit

Ethereal credits Stefan Esser for reporting this vulnerability.

This document was written by Damon Morda.

Other Information

CVE IDs: CVE-2004-0176
Severity Metric: 9.82
Date Public: 2004-03-22
Date First Published: 2004-03-24
Date Last Updated: 2004-03-25 16:50 UTC
Document Revision: 25

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