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Secunia Security Advisory 37517

Secunia Security Advisory 37517
Posted Dec 1, 2009
Authored by Secunia | Site secunia.com

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

tags | advisory, local
systems | freebsd
SHA-256 | fc600204ab61f2f8286b4966d9686da71ea81bc57b72a3dc5d6cd2edff6a346f

Secunia Security Advisory 37517

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For more information visit:
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TITLE:
FreeBSD Dynamic Linker Privilege Escalation Vulnerability

SECUNIA ADVISORY ID:
SA37517

VERIFY ADVISORY:
http://secunia.com/advisories/37517/

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:
The vendor has released a preliminary patch.
http://people.freebsd.org/~cperciva/rtld.patch

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

----------------------------------------------------------------------

About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
http://secunia.com/advisories/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/advisories/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

----------------------------------------------------------------------

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