OpenBSD ELF ld.so Environment Cleaning Vulnerability - Secunia Advisories - Vulnerability Intelligence

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OpenBSD ELF ld.so Environment Cleaning Vulnerability
Secunia Advisory:	SA22993	Advisory Toolbox: Issue ticket Save in to-do list Mark as handled Exploit information Download as PDF Review actions Add comment
Release Date:	2006-11-20
Last Update:	2006-11-30
Popularity:	8,219 views

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

OS:	OpenBSD 3.x OpenBSD 4.0

Subscribe:	Instant alerts on relevant vulnerabilities

CVE reference:	CVE-2006-6164

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

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