OpenBSD ELF ld.so(1) privilege escalation

openbsd-elf-privilege-escalation (30441)

Medium Risk

Description:

OpenBSD on ELF-based systems could allow a local attacker to gain elevated privileges, caused by a vulnerability in the ld.so(1) program image. A local attacker could exploit this vulnerability to obtain sensitive information or gain elevated privileges on the system.

*CVSS:

Base Score:	3.3
Access Vector:	Local
Access Complexity:	Low
Authentication:	Not Required
Confidentiality Impact:	Partial
Integrity Impact:	Partial
Availability Impact:	None
Temporal Score:	2.4
Exploitability:	Unproven
Remediation Level:	Official-Fix
Report Confidence:	Confirmed

Consequences:

Gain Privileges

Remedy:

For OpenBSD 4.0:
Apply the patch for this vulnerability (005_ldso.patch), as listed in the OpenBSD 4.0 errata. See References.

For OpenBSD 3.9:
Apply the patch for this vulnerability (016_ldso.patch), as listed in the OpenBSD 3.9 errata. See References.

References:

• OpenBSD 3.0 errata: 016: SECURITY FIX: November 19, 2006 .
• OpenBSD 4.0 errata: 005: SECURITY FIX: November 19, 2006 .
• BID-21188: OpenBSD LD.SO Local Environment Variable Clearing Vulnerability
• CVE-2006-6164: 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.
• SA22993: OpenBSD ELF ld.so Environment Cleaning Vulnerability
• SECTRACK ID: 1017253: OpenBSD `ld.so(1)` May Let Local Users Gain Elevated Privileges

Platforms Affected:

• OpenBSD OpenBSD 3.9
• OpenBSD OpenBSD 4.0

Reported:

Nov 19, 2006

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The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

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