OpenBSD ELF ld.so Environment Cleaning Vulnerability - Advisories

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OpenBSD ELF ld.so Environment Cleaning Vulnerability

Secunia Advisory:	SA22993
Release Date:	2006-11-20
Last Update:	2006-11-30

Critical:	Less critical
Impact:	Privilege escalation
Where:	Local system
Solution Status:	Vendor Patch

OS:	OpenBSD 3.x OpenBSD 4.0


CVE reference:	CVE-2006-6164 (Secunia mirror)

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Description: A vulnerability has been reported in OpenBSD, which can be exploited by malicious, local users to gain escalated privileges. The vulnerability is caused due to the "_dl_unsetenv()" function of the OpenBSD dynamic loader failing to properly sanitise the environment. This can be exploited to gain escalated privileges by calling suid "root" binaries with specially crafted environment variables. Solution: Apply patch. OpenBSD 4.0: ftp://ftp.openbsd.org/pub/OpenBSD/patches/4.0/common/005_ldso.patch OpenBSD 3.9: ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.9/common/016_ldso.patch Provided and/or discovered by: Reported by Mark Dowd, John McDonald and Justin Schuh. Changelog: 2006-11-23: Added additional information. 2006-11-30: Added CVE reference. Original Advisory: http://www.openbsd.org/errata.html#ldso http://lists.grok.org.uk/pipermail/full-disclosure/2006-November/050829.html



Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise. Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.

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