Linux Kernel may fail to properly handle SNMP packets

Overview

A memory freeing vulnerability in the Linux kernel module ip_nat_snmp_basic can be exploited to create a denial-of-service condition.

Description

**ip_nat_snmp_basic**

The ip_nat_snmp_basic IP NAT module is intended for use with SNMP network discovery and monitoring applications where target networks use conflicting private IP addresses .

**snmp_trap_decode()**

The snmp_trap_decode(``)function decodes v1 and v2 SNMP messages.

The Problem

The function snmp_trap_decode() in the Linux kernel module ip_nat_snmp_basic fails to properly free memory when handling certain SNMP packets.

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Impact

A remote attacker could cause a system running Linux kernel version < 2.6.16.18 with the ip_nat_snmp_basic module loaded to crash. This results in a denial-of-service condition.

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Solution

Apply an update
See the systems affected section of this document for information about specific vendors. Users who compile the Linux kernel from source are encouraged to upgrade to Linux kernel version 2.6.16.18.

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Do not use**ip_nat_snmp_basic**

Do not load the ip_nat_snmp_basic kernel module if it is not needed.

Restrict Access

Limit access to SNMP ports (default 161/udp and 162/udp) to trusted hosts.

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Vendor Information

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Mandriva, Inc. __ Affected

Updated: June 09, 2006

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

Mandriva, Inc. has published Mandriva Linux Security Advisory MDKSA-2006:087 in response to this issue. Users are encouraged to review this advisory and apply the patches it refers to.

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23681569 Feedback>).

Trustix Secure Linux __ Affected

Updated: June 09, 2006

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

Trustix has published Trustix Secure Linux Security Advisory #2006-0030 in response to this issue. Users are encouraged to review this advisory and apply the patches it refers to.

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23681569 Feedback>).

CVSS Metrics

Group	Score	Vector
Base
Temporal
Environmental

References

• <http://secunia.com/advisories/20225/&gt;
• <http://kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.16.18&gt;
• <http://secunia.com/advisories/20182/&gt;

Acknowledgements

This vulnerability was reported by Patrick McHardy.

This document was written by Ryan Giobbi.

Other Information

CVE IDs:	CVE-2006-2444
Severity Metric:	2.69 Date Public: