From: Secunia Security Advisories (sec-advsecunia.com)
Date: Thu Mar 26 2009 - 20:10:05 CDT

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TITLE:
SystemTap Module Loading Race Condition Privilege Escalation

SECUNIA ADVISORY ID:
SA34475

VERIFY ADVISORY:
http://secunia.com/advisories/34475/

DESCRIPTION:
A security issue has been reported in SystemTap, which can be
exploited by malicious, local users to gain escalated privileges.

The security issue is caused due to a race condition while checking
and loading certain kernel modules, which can be exploited by e.g.
symlinking to valid kernel modules during the time of check and
replacing it with a symlink to a malicious kernel module before it's
loaded.

Successful exploitation allows to e.g. gain "stapdev" group or "root"
privileges, but requires membership of the "stapusr" group and that
the "/lib/modules/$VERSION/systemtap" directory exists.

SOLUTION:
Fixed in the GIT repository.
http://sources.redhat.com/git/?p=systemtap.git;a=commit;h=b41a544e20a42413daa0323d2f149e9e34586ccf

PROVIDED AND/OR DISCOVERED BY:
Erik Sjoelund

ORIGINAL ADVISORY:
DSA-1755-1:
http://lists.debian.org/debian-security-announce/2009/msg00065.html

Red Hat Bug #489808:
https://bugzilla.redhat.com/show_bug.cgi?id=489808

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