CVE-2006-6164 - Prudish Regret

Description

The _dl_unsetenv function in loader.c in the ELF ld.so in OpenBSD 3.9 and 4.0 does not properly remove duplicate environment variables which allows local users to pass dangerous variables such as LD_PRELOAD to loading processes which might be leveraged to gain privileges.

Reference

http://www.matasano.com/log/592/finger-79tcp-mcdonald-dowd-and-schuh-challenge-part-2/ http://www.openbsd.org/errata39.html#ldso http://www.openbsd.org/errata.html#ldso http://securitytracker.com/id?1017253 http://secunia.com/advisories/22993 http://www.securityfocus.com/bid/21188 https://exchange.xforce.ibmcloud.com/vulnerabilities/30441 http://www.securityfocus.com/archive/1/452428/100/0/threaded http://www.securityfocus.com/archive/1/452371/100/0/threaded