glsa-201001-05.xml


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<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="201001-05">
  <title>net-snmp: Authorization bypass</title>
  <synopsis>
    A remote attacker can bypass the tcp-wrappers client authorization in
    net-snmp.
  </synopsis>
  <product type="ebuild">net-snmp</product>
  <announced>2010-01-13</announced>
  <revised>2010-01-13: 01</revised>
  <bug>250429</bug>
  <access>remote</access>
  <affected>
    <package name="net-analyzer/net-snmp" auto="yes" arch="*">
      <unaffected range="ge">5.4.2.1-r1</unaffected>
      <vulnerable range="lt">5.4.2.1-r1</vulnerable>
    </package>
  </affected>
  <background>
    <p>
    net-snmp bundles software for generating and retrieving SNMP data.
    </p>
  </background>
  <description>
    <p>
    The netsnmp_udp_fmtaddr() function (snmplib/snmpUDPDomain.c), when
    using TCP wrappers for client authorization, does not properly parse
    hosts.allow rules.
    </p>
  </description>
  <impact type="normal">
    <p>
    A remote, unauthenticated attacker could bypass the ACL filtering,
    possibly resulting in the execution of arbitrary SNMP queries.
    </p>
  </impact>
  <workaround>
    <p>
    If possible, protect net-snmp with custom iptables rules:
    </p>
    <code>
    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</code>
  </workaround>
  <resolution>
    <p>
    All net-snmp users should upgrade to the latest version:
    </p>
    <code>
    # emerge --sync
    # emerge --ask --oneshot --verbose "&gt;=net-analyzer/net-snmp-5.4.2.1-r1"</code>
  </resolution>
  <references>
    <uri link="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-6123">CVE-2008-6123</uri>
  </references>
  <metadata tag="requester" timestamp="2009-09-28T18:16:15Z">
    craig
  </metadata>
  <metadata tag="submitter" timestamp="2010-01-05T21:17:32Z">
    craig
  </metadata>
  <metadata tag="bugReady" timestamp="2010-01-10T19:40:57Z">
    craig
  </metadata>
</glsa>