Ethereal fails to properly handle malformed iSNS packets

Overview

Ethereal contains a vulnerability in the way it processes Internet Storage Name Service (iSNS) packets.

Description

The Internet Storage Name Service (iSNS) protocol is used to automate the discovery, management, and configuration of iSCSI and Fibre Channel devices in an IP network. Ethereal includes the ability to decode packets containing iSNS data. There is a vulnerability in the way the iSNS dissector decodes malformed iSNS packets. By sending a malformed iSNS packet or convincing a victim to read a malformed packet trace file, a remote, unauthenticated attacker could cause Ethereal to crash or potentially execute code of the attacker’s choice.

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Impact

A remote, unauthenticated attacker could cause Ethereal to crash or potentially execute code of the attacker’s choice.

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Solution

Upgrade

Upgrade to version 0.10.5 or later.

Note: Ethereal is considered BETA software at this time.

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Disable iSNS protocol dissector

If you are unable to upgrade to version 0.10.5 or later, you can disable the iSNS protocol dissector by performing the following actions in Ethereal:

1. Select Analyze->Enabled Protocols
2. Disable the iSNS protocol dissector from the list by unchecking its “Status” checkbox

However, it is strongly encouraged to upgrade to version 0.10.5 or later.

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Vendor Information

829422

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Ethereal __ Affected

Updated: September 07, 2004

Status

Affected

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

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

Addendum

Please refer to Ethereal Security Advisory enpa-sa-00015.

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23829422 Feedback>).

CVSS Metrics

Group	Score	Vector
Base
Temporal
Environmental

References

• <http://www.ethereal.com/appnotes/enpa-sa-00015.html&gt;
• <http://www.networksorcery.com/enp/protocol/isns.htm&gt;
• <http://secunia.com/advisories/12024/&gt;
• <http://xforce.iss.net/xforce/xfdb/16630&gt;
• <http://www.securitytracker.com/alerts/2004/Jul/1010655.html&gt;
• <http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=127381&gt;
• <http://www.redhat.com/archives/fedora-announce-list/2004-July/msg00013.html&gt;
• <http://www.redhat.com/archives/fedora-announce-list/2004-July/msg00014.html&gt;
• <http://www.redhat.com/support/errata/RHSA-2004-378.html&gt;
• <http://www.gentoo.org/security/en/glsa/glsa-200407-08.xml&gt;
• <http://www.mandrakesecure.net/en/advisories/advisory.php?name=MDKSA-2004:067&gt;

Acknowledgements

This vulnerability was reported by the maintainers of Ethereal.

This document was written by Damon Morda.

Other Information

CVE IDs:	CVE-2004-0633
Severity Metric:	8.09 Date Public: