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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 |
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Title: net-snmp: Authorization bypass |
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Date: January 13, 2010 |
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Bugs: #250429 |
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ID: 201001-05 |
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Synopsis |
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======== |
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|
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A remote attacker can bypass the tcp-wrappers client authorization in |
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net-snmp. |
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Background |
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========== |
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|
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net-snmp bundles software for generating and retrieving SNMP data. |
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Affected packages |
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================= |
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|
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------------------------------------------------------------------- |
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Package / Vulnerable / Unaffected |
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------------------------------------------------------------------- |
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1 net-analyzer/net-snmp < 5.4.2.1-r1 >= 5.4.2.1-r1 |
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Description |
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=========== |
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|
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The netsnmp_udp_fmtaddr() function (snmplib/snmpUDPDomain.c), when |
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using TCP wrappers for client authorization, does not properly parse |
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hosts.allow rules. |
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Impact |
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====== |
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|
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A remote, unauthenticated attacker could bypass the ACL filtering, |
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possibly resulting in the execution of arbitrary SNMP queries. |
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Workaround |
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========== |
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If possible, protect net-snmp with custom iptables rules: |
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iptables -s [client] -d [host] -p udp --dport 161 -j ACCEPT |
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iptables -s 0.0.0.0/0 -d [host] -p udp --dport 161 -j DROP |
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Resolution |
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========== |
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All net-snmp users should upgrade to the latest version: |
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# emerge --sync |
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# emerge --ask --oneshot --verbose ">=net-analyzer/net-snmp-5.4.2.1-r1" |
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References |
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========== |
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[ 1 ] CVE-2008-6123 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-6123 |
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Availability |
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============ |
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This GLSA and any updates to it are available for viewing at |
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the Gentoo Security Website: |
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http://security.gentoo.org/glsa/glsa-201001-05.xml |
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Concerns? |
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========= |
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Security is a primary focus of Gentoo Linux and ensuring the |
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confidentiality and security of our users machines is of utmost |
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importance to us. Any security concerns should be addressed to |
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security@g.o or alternatively, you may file a bug at |
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https://bugs.gentoo.org. |
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License |
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======= |
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Copyright 2010 Gentoo Foundation, Inc; referenced text |
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belongs to its owner(s). |
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The contents of this document are licensed under the |
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Creative Commons - Attribution / Share Alike license. |
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http://creativecommons.org/licenses/by-sa/2.5 |
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