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

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

Affected packages
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    -------------------------------------------------------------------
     Package                /   Vulnerable   /              Unaffected
    -------------------------------------------------------------------
  1  net-analyzer/net-snmp     < 5.4.2.1-r1              >=3D 5.4.2.1-r1

Description
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The netsnmp_udp_fmtaddr() function (snmplib/snmpUDPDomain.c), when
using TCP wrappers for client authorization, does not properly parse
hosts.allow rules.

Impact
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A remote, unauthenticated attacker could bypass the ACL filtering,
possibly resulting in the execution of arbitrary SNMP queries.

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

    # emerge --sync
    # emerge --ask --oneshot --verbose
 ">=3Dnet-analyzer/net-snmp-5.4.2.1=
-r1"

References
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  [ 1 ] CVE-2008-6123
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=3DCVE-2008-6123

Availability
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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?
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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
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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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