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Vulnerability Note VU#644886

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

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.

I. 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.

II. Impact

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

III. 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.

Systems Affected

VendorStatusDate NotifiedDate Updated
EtherealVulnerable24-Mar-2004

References


http://security.e-matters.de/advisories/032004.html
http://www.ethereal.com/appnotes/enpa-sa-00013.html
http://secunia.com/advisories/11185/

Credit

Ethereal credits Stefan Esser for reporting this vulnerability.

This document was written by Damon Morda.

Other Information

Date Public:2004-03-22
Date First Published:2004-03-24
Date Last Updated:2004-03-25
CERT Advisory: 
CVE-ID(s):CAN-2004-0176
NVD-ID(s):CAN-2004-0176
US-CERT Technical Alerts: 
Metric:9.82
Document Revision:25

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