Net-SNMP: Denial of Service

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200901-15 / net-snmp
Release Date	January 21, 2009
Latest Revision	January 21, 2009: 01
Impact	normal
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
net-analyzer/net-snmp	< 5.4.2.1	>= 5.4.2.1	All supported architectures

Related bugreports: #245306

Synopsis

A vulnerability in Net-SNMP could lead to a Denial of Service.

2. Impact Information

Background

Net-SNMP is a collection of tools for generating and retrieving SNMP data.

Description

Oscar Mira-Sanchez reported an integer overflow in the netsnmp_create_subtree_cache() function in agent/snmp_agent.c when processing GETBULK requests.

Impact

A remote attacker could send a specially crafted request to crash the SNMP server. NOTE: The attacker needs to know the community string to exploit this vulnerability.

3. Resolution Information

Workaround

Restrict access to trusted entities only.

Resolution

All Net-SNMP users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=net-analyzer/net-snmp-5.4.2.1"

4. References

CVE-2008-4309

Updated January 21, 2009

Summary: This is a Gentoo Linux Security Advisory

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