Do we have fcron? Because if we do, I think I know what is going on here.
On Halloween, November 6, and November 9 of this month, I found that only I had no internet connection. I had xorg and the time. A local user can use fcron to perform a denial of service. In Linux.
We have Xorg too. I had no connection on those days I mentioned. This morning, I found my internet connection disabled here. Easy to fix. Reenable it.
The DOS happened on my birthday and my parrents anninversery. I had four open accounts, limited, and cygwin was installed. Now, those accounts are closed and I still have cygwin.
Read this.
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11/20/2004
* Gentoo Linux Security Advisory GLSA 200411-27
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http://security.gentoo.org/
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Severity: Normal Title: Fcron: Multiple vulnerabilities Date: November 18, 2004 Bugs: #71311 ID: 200411-27
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Synopsis ========
Multiple vulnerabilities in Fcron can allow a local user to potentially cause a Denial of Service.
Background ==========
Fcron is a command scheduler with extended capabilities over cron and anacron.
Affected packages =============== ------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 sys-apps/fcron <= 2.9.5 *>= 2.0.2
= 2.9.5.1
Description ==========
Due to design errors in the fcronsighup program, Fcron may allow a local user to bypass access restrictions (CAN-2004-1031), view the contents of root owned files (CAN-2004-1030), remove arbitrary files or create empty files (CAN-2004-1032), and send a SIGHUP to any process. A vulnerability also exists in fcrontab which may allow local users to view the contents of fcron.allow and fcron.deny (CAN-2004-1033).
Impact ======
A local attacker could exploit these vulnerabilities to perform a Denial of Service on the system running Fcron.
Workaround ==========
Make sure the fcronsighup and fcrontab binaries are only executable by trusted users.
Resolution =========
All Fcron users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose ">=sys-apps/fcron-2.0.2"
References ==========
[ 1 ] CAN-2004-1030 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-1030 [ 2 ] CAN-2004-1031 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-1031 [ 3 ] CAN-2004-1032 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-1032 [ 4 ] CAN-2004-1033 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-1033
Availability =========
This GLSA and any updates to it are available for viewing at the Gentoo Security Website:
http://security.gentoo.org/glsa/glsa-200411-27.xml
Concerns? =========
Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security_at_gentoo.org or alternatively, you may file a bug at http://bugs.gentoo.org.
