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TITLE:
FreeBSD "fruncate()" and Scheduler Local Denial of Service

SECUNIA ADVISORY ID:
SA22413

VERIFY ADVISORY:
http://secunia.com/advisories/22413/

CRITICAL:
Not critical

IMPACT:
DoS

WHERE:
Local system

OPERATING SYSTEM:
FreeBSD 4.x
http://secunia.com/product/139/
FreeBSD 5.x
http://secunia.com/product/1132/
FreeBSD 6.x
http://secunia.com/product/6778/

DESCRIPTION:
Some vulnerabilities have been reported in FreeBSD, which can be
exploited by malicious, local users to cause a DoS (Denial of
Service).

1) An error exist within the "ftruncate()" function when being used
on certain file types. This can be exploited to cause a DoS by e.g.
calling "ftruncate()" on a FIFO file.

2) FreeBSD permits unprivileged users to set the scheduler policy.
This can be exploited to cause a DoS by e.g. setting the maximum
priority for a process with large CPU usage.

SOLUTION:
Fixed in CVS.

PROVIDED AND/OR DISCOVERED BY:
Disclosed in a CVS commit by the vendor.

ORIGINAL ADVISORY:
http://lists.freebsd.org/pipermail/cvs-src/2006-May/063969.html
http://lists.freebsd.org/pipermail/cvs-src/2006-May/064488.html

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