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Gentoo Linux Security Advisory GLSA 200704-11 |
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http://security.gentoo.org/ |
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Severity: Low |
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Title: Vixie Cron: Denial of Service |
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Date: April 16, 2007 |
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Bugs: #164466 |
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ID: 200704-11 |
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Synopsis |
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======== |
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|
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The Gentoo implementation of Vixie Cron is vulnerable to a local Denial |
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of Service. |
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Background |
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========== |
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|
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Vixie Cron is a command scheduler with extended syntax over cron. |
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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 sys-process/vixie-cron < 4.1-r10 >= 4.1-r10 |
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Description |
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=========== |
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During an internal audit, Raphael Marichez of the Gentoo Linux Security |
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Team found that Vixie Cron has weak permissions set on Gentoo, allowing |
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for a local user to create hard links to system and users cron files, |
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while a st_nlink check in database.c will generate a superfluous error. |
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|
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Impact |
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====== |
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|
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Depending on the partitioning scheme and the "cron" group membership, a |
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malicious local user can create hard links to system or users cron |
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files that will trigger the st_link safety check and prevent the |
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targeted cron file from being run from the next restart or database |
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reload. |
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Workaround |
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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 Vixie Cron users should upgrade to the latest version: |
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# emerge --sync |
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# emerge --ask --oneshot --verbose ">=sys-process/vixie-cron-4.1-r10" |
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References |
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========== |
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[ 1 ] CVE-2007-1856 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-1856 |
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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-200704-11.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 2007 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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