[gentoo-announce] [ GLSA 201001-05 ] net-snmp: Authorization bypass

[news 28]

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Gentoo Linux Security Advisory GLSA 201001-05

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http://security.gentoo.org/

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Severity: Normal

Title: net-snmp: Authorization bypass

Date: January 13, 2010

Bugs: #250429

ID: 201001-05

 

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Synopsis

========

 

A remote attacker can bypass the tcp-wrappers client authorization in

net-snmp.

 

Background

==========

 

net-snmp bundles software for generating and retrieving SNMP data.

 

Affected packages

=================

 

-------------------------------------------------------------------

Package / Vulnerable / Unaffected

-------------------------------------------------------------------

1 net-analyzer/net-snmp < 5.4.2.1-r1 >= 5.4.2.1-r1

 

Description

===========

 

The netsnmp_udp_fmtaddr() function (snmplib/snmpUDPDomain.c), when

using TCP wrappers for client authorization, does not properly parse

hosts.allow rules.

 

Impact

======

 

A remote, unauthenticated attacker could bypass the ACL filtering,

possibly resulting in the execution of arbitrary SNMP queries.

 

Workaround

==========

 

If possible, protect net-snmp with custom iptables rules:

 

iptables -s [client] -d [host] -p udp --dport 161 -j ACCEPT

iptables -s 0.0.0.0/0 -d [host] -p udp --dport 161 -j DROP

 

Resolution

==========

 

All net-snmp users should upgrade to the latest version:

 

# emerge --sync

# emerge --ask --oneshot --verbose ">=net-analyzer/net-snmp-5.4.2.1-r1"

 

References

==========

 

[ 1 ] CVE-2008-6123

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-6123

 

Availability

============

 

This GLSA and any updates to it are available for viewing at

the Gentoo Security Website:

 

http://security.gentoo.org/glsa/glsa-201001-05.xml

 

Concerns?

=========

 

Security is a primary focus of Gentoo Linux and ensuring the

confidentiality and security of our users machines is of utmost

importance to us. Any security concerns should be addressed to

security ( -at -) gentoo.org or alternatively, you may file a bug at

https://bugs.gentoo.org.

 

License

=======

 

Copyright 2010 Gentoo Foundation, Inc; referenced text

belongs to its owner(s).

 

The contents of this document are licensed under the

Creative Commons - Attribution / Share Alike license.

 

http://creativecommons.org/licenses/by-sa/2.5