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Gentoo Linux Security Advisory GLSA 200409-04 |
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http://security.gentoo.org/ |
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Severity: Normal |
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Title: Squid: Denial of service when using NTLM authentication |
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Date: September 02, 2004 |
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Bugs: #61280 |
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ID: 200409-04 |
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Synopsis |
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======== |
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|
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Squid is vulnerable to a denial of service attack which could crash its |
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NTLM helpers. |
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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 <= 2.5.6-r1 >= 2.5.6-r2 |
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< 2.5 |
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|
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Description |
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=========== |
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|
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Squid 2.5.x versions contain a bug in the functions ntlm_fetch_string() |
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and ntlm_get_string() which lack checking the int32_t offset "o" for |
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negative values. |
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|
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Impact |
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====== |
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|
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A remote attacker could cause a denial of service situation by sending |
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certain malformed NTLMSSP packets if NTLM authentication is enabled. |
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|
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Workaround |
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========== |
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|
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Disable NTLM authentication by removing any "auth_param ntlm program |
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..." directives from squid.conf or use ntlm_auth from Samba-3.x. |
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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 stable version: |
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|
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# emerge sync |
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|
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# emerge -pv ">=net-www/squid-2.5.6-r2" |
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# emerge ">=net-www/squid-2.5.6-r2" |
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|
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References |
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========== |
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|
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[ 1 ] Squid-2.5 Patches |
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|
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http://www1.uk.squid-cache.org/squid/Versions/v2/2.5/bugs/#squid-2.5.STABLE6-ntlm_fetch_string |
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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-200409-04.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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http://creativecommons.org/licenses/by-sa/1.0 |
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