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full-disclosure-uk: [Full-disclosure] [ GLSA 201001-05 ] net-snm

[Full-disclosure] [ GLSA 201001-05 ] net-snmp: Authorization bypass

From: Stefan Behte <craig_at_nospam>
Date: Wed Jan 13 2010 - 22:06:35 GMT
To: gentoo-announce@gentoo.org

  • - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 201001-05
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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@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



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