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FreeBSD Dynamic Linker Privilege Escalation Vulnerability

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Release Date:  2009-12-01    Last Update:  2009-12-03    Views:  4,069

Secunia Advisory SA37517

Where:

Local system

Impact:

Privilege escalation

Solution Status:

Vendor Patch

Operating System:

CVE Reference(s):

Description


Nikolaos Rangos has discovered a vulnerability in FreeBSD, which can be exploited by malicious, local users to gain escalated privileges.

The vulnerability is caused due to the "_rtld()" function in libexec/rtld-elf/rtld.c not correctly clearing certain dangerous environment variables before executing suid root processes, which can be exploited to execute arbitrary code with root privileges.

The vulnerability is reported in version 7.1 and also confirmed in version 8.0.


Solution:
Update FreeBSD or apply patches.

Further details available to Secunia VIM customers

Provided and/or discovered by:
Nikolaos Rangos aka Kingcope

Original Advisory:
Kingcope:
http://archives.neohapsis.com/archives/fulldisclosure/2009-11/0372.html

FreeBSD:
http://lists.freebsd.org/pipermail/freebsd-announce/2009-December/001286.html
http://security.freebsd.org/advisories/FreeBSD-SA-09:16.rtld.asc

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: FreeBSD Dynamic Linker Privilege Escalation Vulnerability

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