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TITLE:
Linux Kernel "clone()" Child Signal Sending Weakness

SECUNIA ADVISORY ID:
SA34033

VERIFY ADVISORY:
http://secunia.com/advisories/34033/

DESCRIPTION:
A weakness has been reported in the Linux Kernel, which can be
exploited by malicious, local users to bypass certain security
restrictions.

The weakness is caused due to an error when processing the signals
sent by a child process created via the "clone()" system call and the
"CLONE_PARENT" flag, which can be exploited to e.g. kill a parent
process with higher privileges.

Successful exploitation e.g. requires that the privileged parent
process launches user supplied applications as child processes.

SOLUTION:
Restrict access to trusted users only.

PROVIDED AND/OR DISCOVERED BY:
Chris Evans

ORIGINAL ADVISORY:
http://scary.beasts.org/security/CESA-2009-002.html

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