Ethereal fails to properly handle malformed SMB packets

Overview

Ethereal contains a vulnerability in the way it processes Server Message Block (SMB) packets.

Description

The Server Message Block (SMB) protocol is used for sharing files, printers, and other resources between computers. SMB is used in Microsoft Windows to provide file and print services. Ethereal includes the ability to decode packets containing SMB data. There is a vulnerability in the way the SMB dissector decodes SMB packets containing a policy name without a handle. If SID snooping is enabled, this could trigger a null pointer dereference and 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 SID Snooping

1. Select Edit –> Preferences
2. Expand the Protocols section
3. Select SMB
4. Disable the checkbox for “Snoop SID to Name mappings”

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

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Vendor Information

518782

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Ethereal __ Affected

Updated: September 01, 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%23518782 Feedback>).

CVSS Metrics

Group	Score	Vector
Base
Temporal
Environmental

References

• <http://www.ethereal.com/appnotes/enpa-sa-00015.html&gt;
• <http://xforce.iss.net/xforce/xfdb/16631&gt;
• <http://secunia.com/advisories/12024/&gt;
• <http://www.securityfocus.com/bid/10672&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/support/errata/RHSA-2004-378.html&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.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-2004-0634
Severity Metric:	8.09 Date Public: