Bug 235882 - (CVE-2007-1856) CVE-2007-1856 crontab denial of service
CVE-2007-1856 crontab denial of service
Status: CLOSED CURRENTRELEASE
Product: Fedora
Classification: Fedora
Component: vixie-cron (Show other bugs)
6
All Linux
medium Severity medium
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Assigned To: Marcela Mašláňová
Brock Organ
impact=moderate,source=vendorsec,repo...
: Reopened, Security
Depends On:
Blocks:
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Reported: 2007-04-10 12:54 EDT by Josh Bressers
Modified: 2007-11-30 17:12 EST (History)
0 users

See Also:
Fixed In Version: vixie-cron-4.1-69
Doc Type: Bug Fix
Doc Text:
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Last Closed: 2007-08-06 03:17:13 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description Josh Bressers 2007-04-10 12:54:09 EDT
+++ This bug was initially created as a clone of Bug #235880 +++

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 FC5
Comment 1 Marcela Mašláňová 2007-04-10 17:02:18 EDT
Thanks for patch. Fixed in vixie-cron-4.1-81
Comment 2 Lubomir Kundrak 2007-08-02 08:34:40 EDT
Reopening, as this is an unfixed security issue.
Marcela: please push the fixed version into FC6.
Comment 3 Marcela Mašláňová 2007-08-06 03:17:13 EDT
Fixed in update vixie-cron-4.1-69.

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