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Gentoo Linux Security Advisory GLSA 200606-19 |
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http://security.gentoo.org/ |
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Severity: Normal |
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Title: Sendmail: Denial of Service |
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Date: June 15, 2006 |
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Bugs: #135141 |
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ID: 200606-19 |
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Synopsis |
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======== |
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|
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Faulty multipart MIME messages can cause forked Sendmail processes to |
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crash. |
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Background |
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========== |
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|
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Sendmail is a popular mail transfer agent (MTA). |
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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 mail-mta/sendmail < 8.13.6-r1 >= 8.13.6-r1 |
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|
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Description |
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=========== |
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|
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Frank Sheiness discovered that the mime8to7() function can recurse |
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endlessly during the decoding of multipart MIME messages until the |
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stack of the process is filled and the process crashes. |
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|
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Impact |
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====== |
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|
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By sending specially crafted multipart MIME messages, a remote attacker |
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can cause a subprocess forked by Sendmail to crash. If Sendmail is not |
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set to use a randomized queue processing, the attack will effectively |
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halt the delivery of queued mails as well as the malformed one, |
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incoming mail delivered interactively is not affected. Additionally, on |
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systems where core dumps with an individual naming scheme (like |
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"core.pid") are enabled, a filesystem may fill up with core dumps. Core |
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dumps are disabled by default in Gentoo. |
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|
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Workaround |
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========== |
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The Sendmail 8.13.7 release information offers some workarounds, please |
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see the Reference below. Note that the issue has actually been fixed in |
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the 8.13.6-r1 ebuild. |
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Resolution |
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========== |
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All Sendmail users should upgrade to the latest version: |
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# emerge --sync |
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# emerge --ask --oneshot --verbose ">=mail-mta/sendmail-8.13.6-r1" |
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|
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References |
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========== |
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[ 1 ] CVE-2006-1173 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-1173 |
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[ 2 ] Sendmail 8.13.7 release information |
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http://www.sendmail.org/releases/8.13.7.html |
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|
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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-200606-19.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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http://bugs.gentoo.org. |
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License |
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======= |
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Copyright 2006 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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