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Insecure Library Loading
Not critical

SystemTap Module Loading Race Condition Privilege Escalation

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Release Date:  2009-03-26    Views:  2,524

Secunia Advisory SA34475

Where:

Local system

Impact:

Privilege escalation

Solution Status:

Vendor Patch

Software:

CVE Reference(s):

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.

Further details available to Secunia VIM customers

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

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: SystemTap Module Loading Race Condition Privilege Escalation

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