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Gentoo Linux Security Advisory GLSA 200409-21 |
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http://security.gentoo.org/ |
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Severity: Normal |
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Title: Apache 2, mod_dav: Multiple vulnerabilities |
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Date: September 16, 2004 |
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Bugs: #62626, #63948, #64145 |
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ID: 200409-21 |
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Synopsis |
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======== |
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|
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Several vulnerabilities have been found in Apache 2 and mod_dav for |
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Apache 1.3 which could allow a remote attacker to cause a Denial of |
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Service or a local user to get escalated privileges. |
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|
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Background |
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========== |
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|
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The Apache HTTP server is one of most popular web servers on the |
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internet. mod_ssl provides SSL v2/v3 and TLS v1 support for it and |
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mod_dav is the Apache module for Distributed Authoring and Versioning |
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(DAV). |
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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 net-www/apache < 2.0.51 >= 2.0.51 |
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< 2.0 |
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2 net-www/mod_dav <= 1.0.3-r1 >= 1.0.3-r2 |
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------------------------------------------------------------------- |
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2 affected packages on all of their supported architectures. |
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------------------------------------------------------------------- |
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|
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Description |
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=========== |
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|
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A potential infinite loop has been found in the input filter of mod_ssl |
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(CAN-2004-0748) as well as a possible segmentation fault in the |
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char_buffer_read function if reverse proxying to a SSL server is being |
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used (CAN-2004-0751). Furthermore, mod_dav, as shipped in Apache httpd |
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2 or mod_dav 1.0.x for Apache 1.3, contains a NULL pointer dereference |
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which can be triggered remotely (CAN-2004-0809). The third issue is an |
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input validation error found in the IPv6 URI parsing routines within |
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the apr-util library (CAN-2004-0786). Additionally a possible buffer |
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overflow has been reported when expanding environment variables during |
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the parsing of configuration files (CAN-2004-0747). |
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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 either by aborting a |
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SSL connection in a special way, resulting in CPU consumption, by |
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exploiting the segmentation fault in mod_ssl or the mod_dav flaw. A |
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remote attacker could also crash a httpd child process by sending a |
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specially crafted URI. The last vulnerabilty could be used by a local |
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user to gain the privileges of a httpd child, if the server parses a |
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carefully prepared .htaccess file. |
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|
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Workaround |
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========== |
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|
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There is no known workaround at this time. |
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Resolution |
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========== |
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All Apache 2 users should upgrade to the latest version: |
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# emerge sync |
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# emerge -pv ">=net-www/apache-2.0.51" |
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# emerge ">=net-www/apache-2.0.51" |
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|
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All mod_dav users should upgrade to the latest version: |
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|
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# emerge sync |
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# emerge -pv ">=net-www/mod_dav-1.0.3-r2" |
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# emerge ">=net-www/mod_dav-1.0.3-r2" |
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|
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References |
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========== |
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|
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[ 1 ] CAN-2004-0747 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0747 |
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[ 2 ] CAN-2004-0748 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0748 |
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[ 3 ] CAN-2004-0751 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0751 |
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[ 4 ] CAN-2004-0786 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0786 |
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[ 5 ] CAN-2004-0809 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0809 |
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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-200409-21.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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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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