Bug 235880 - CVE-2007-1856 crontab denial of service
CVE-2007-1856 crontab denial of service
Status: CLOSED ERRATA
Product: Red Hat Enterprise Linux 5
Classification: Red Hat
Component: vixie-cron (Show other bugs)
5.0
All Linux
medium Severity medium
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Assigned To: Marcela Mašláňová
Brock Organ
impact=moderate,source=vendorsec,repo...
: Security
Depends On:
Blocks: RHEL5LSPPCertTracker
  Show dependency treegraph
 
Reported: 2007-04-10 12:43 EDT by Josh Bressers
Modified: 2007-11-30 17:07 EST (History)
2 users (show)

See Also:
Fixed In Version: RHSA-2007-0345
Doc Type: Bug Fix
Doc Text:
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Last Closed: 2007-05-17 10:26:06 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description Josh Bressers 2007-04-10 12:43:23 EDT
Raphael Marichez of Gentoo reported a denial of service flaw in vixie-cron.

By creating a hardlink to /etc/crontab, cron will stop executing the
/etc/crontab file and deposit an error message in /var/log/cron.

This can be easily tested by running:
ln /etc/crontab /tmp/crontab
tail -f /var/log/cron


Here is the patch from Open Wall Linux:
http://cvsweb.openwall.com/cgi/cvsweb.cgi/~checkout~/Owl/packages/vixie-cron/vixie-cron-4.1.20060426-owl-st_nlink.diff?rev=1.1;content-type=text%2Fplain

This flaw also affects RHEL 3 and 4.
Comment 5 RHEL Product and Program Management 2007-04-23 10:23:36 EDT
This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux maintenance release.  Product Management has requested
further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed
products.  This request is not yet committed for inclusion in an Update
release.
Comment 6 Steve Grubb 2007-04-24 14:32:31 EDT
vixie-cron-4.1-68 was built to solve this issue.
Comment 19 Red Hat Bugzilla 2007-05-17 10:26:06 EDT
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHSA-2007-0345.html

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