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Gentoo Linux Security Advisory GLSA 200405-07 |
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http://security.gentoo.org/ |
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Severity: High |
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Title: Exim verify=header_syntax buffer overflow |
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Date: May 14, 2004 |
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Bugs: #50217 |
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ID: 200405-07 |
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Synopsis |
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======== |
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|
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When the verify=header_syntax option is set, there is a buffer overflow |
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in Exim that allows remote execution of arbitrary code. |
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Background |
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========== |
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|
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Exim is an highly configurable message transfer agent (MTA) developed |
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at the University of Cambridge. |
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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-mail/exim <= 4.33 >= 4.33-r1 |
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|
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Description |
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=========== |
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|
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When the option "verify = header_syntax" is used in an ACL in the |
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configuration file, Exim is vulnerable to a buffer overflow attack that |
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can be triggered remotely by sending malicious headers in an email |
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message. Note that this option is not enabled in Exim's default |
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configuration file. |
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|
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Impact |
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====== |
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|
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This vulnerability can be exploited to trigger a denial of service |
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attack and potentially execute arbitrary code with the rights of the |
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user used by the Exim daemon (by default this is the "mail" user in |
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Gentoo Linux). |
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|
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Workaround |
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========== |
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|
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Make sure the verify=header_syntax option is not used in your exim.conf |
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file. |
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Resolution |
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========== |
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All users of Exim should upgrade to the latest stable version: |
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# emerge sync |
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# emerge -pv ">=net-mail/exim-4.33-r1" |
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# emerge ">=net-mail/exim-4.33-r1" |
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|
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References |
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========== |
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|
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[ 1 ] CAN-2004-0400 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0400 |
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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-200405-07.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 Technologies, 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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