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Gentoo Linux Security Advisory GLSA 200410-15 |
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http://security.gentoo.org/ |
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|
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Severity: Normal |
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Title: Squid: Remote DoS vulnerability |
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Date: October 18, 2004 |
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Bugs: #67167 |
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ID: 200410-15 |
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|
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Synopsis |
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======== |
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|
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Squid contains a vulnerability in the SNMP module which may lead to a |
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denial of service. |
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|
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Background |
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========== |
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|
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Squid is a full-featured Web proxy cache designed to run on Unix |
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systems. It supports proxying and caching of HTTP, FTP, and other URLs, |
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as well as SSL support, cache hierarchies, transparent caching, access |
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control lists and many other features. |
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|
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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 www-proxy/squid < 2.5.7 >= 2.5.7 |
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|
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Description |
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=========== |
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|
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A parsing error exists in the SNMP module of Squid where a |
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specially-crafted UDP packet can potentially cause the server to |
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restart, closing all current connections. This vulnerability only |
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exists in versions of Squid compiled with the 'snmp' USE flag. |
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|
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Impact |
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====== |
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|
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An attacker can repeatedly send these malicious UDP packets to the |
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Squid server, leading to a denial of service. |
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|
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Workaround |
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========== |
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|
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Disable SNMP support or filter the port that has SNMP processing |
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(default is 3401) to allow only SNMP data from trusted hosts. |
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|
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To disable SNMP support put the entry snmp_port 0 in the squid.conf |
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configuration file. |
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|
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To allow only the local interface to process SNMP, add the entry |
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"snmp_incoming_address 127.0.0.1" in the squid.conf configuration file. |
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|
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Resolution |
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========== |
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|
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All Squid users should upgrade to the latest version: |
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|
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# emerge sync |
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|
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# emerge -pv ">=www-proxy/squid-2.5.7" |
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# emerge ">=www-proxy/squid-2.5.7" |
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|
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References |
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========== |
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|
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[ 1 ] iDEFENSE Advisory |
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http://www.idefense.com/application/poi/display?id=152&type=vulnerabilities&flashstatus=true |
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|
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Availability |
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============ |
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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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|
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http://security.gentoo.org/glsa/glsa-200410-15.xml |
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|
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Concerns? |
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========= |
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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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http://bugs.gentoo.org. |
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|
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License |
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======= |
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|
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Copyright 2004 Gentoo Foundation, Inc; referenced text |
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belongs to its owner(s). |
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|
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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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|
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http://creativecommons.org/licenses/by-sa/1.0 |