What’s Vulnerable › Vulnerabilities

CVE-2006-6164

• Severity: high (CVSS 7.2 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2006-11-29 · updated 2026-06-16

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.

Affected products

• OpenBSD: 3.9, 4.0

References

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

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