Ethereal fails to properly handle malfored SNMP packets

ID VU:835846
Type cert
Reporter CERT
Modified 2004-09-07T21:17:00



Ethereal contains a vulnerability in the way it processes Simple Network Management Protocol (SNMP) packets.


The Simple Network Management Protocol (SNMP) protocol enables network and system administrators to remotely monitor and configure devices on the network (devices such as switches and routers). Ethereal includes the ability to decode packets containing SNMP data. There is a vulnerability in the way the SNMP dissector decodes SNMP packets containing a malformed or missing community string. By sending a specially crafted SNMP 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.


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



Upgrade to version 0.10.5 or later.

Note: Ethereal is considered BETA software at this time.

Disable SNMP protocl dissector

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

1) Select Analyze->Enabled Protocols
2) Disable the SNMP protocol dissector from the list by unchecking its "Status" checkbox

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

Vendor Information


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__ Ethereal

Updated: September 07, 2004


__ Vulnerable

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

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


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

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


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This vulnerability was reported by the maintainers of Ethereal.

This document was written by Damon Morda.

Other Information

CVE IDs: | CVE-2004-0635
Severity Metric:** | 8.09
Date Public:
| 2004-07-06
Date First Published: | 2004-09-07
Date Last Updated: | 2004-09-07 21:17 UTC
Document Revision: | 7