Security Advisory SA34475 - SystemTap Module Loading Race Condition Privilege Escalation

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Secunia Advisory SA34475

SystemTap Module Loading Race Condition Privilege Escalation

Secunia Advisory

SA34475

Release Date

2009-03-26

Popularity

2,159 views

Comments

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Criticality level

Not critical

Impact

Privilege escalation

Where

Local system

Authentication level

This information is available to Secunia VIM customers

Report reliability

This information is available to Secunia VIM customers

Solution Status

Vendor Patch

Systems affected

This information is available to Secunia VIM customers

Approve distribution

This information is available to Secunia VIM customers

Software:

SystemTap 0.x

Secunia CVSS Score

This information is available to Secunia VIM Customers

CVE Reference(s)

CVE-2009-0784 CVSS score available to Secunia VIM customers

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

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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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Secunia Advisory SA34475

SystemTap Module Loading Race Condition Privilege Escalation

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