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CVE-2009-4146

7.2 · HIGH

The _rtld function in the Run-Time Link-Editor (rtld) in libexec/rtld-elf/rtld.c in FreeBSD 7.1, 7.2, and 8.0 does not clear the LD_PRELOAD environment variable, which allows local users to gain pr…

Published Dec 2, 2009freebsdCWE-264EPSS 3.90%

Overview

CVE-2009-4146 is a high-severity vulnerability affecting freebsd freebsd. It was published on December 2, 2009 and has a CVSS 2.0 base score of 7.2 (HIGH).

This vulnerability has a CVSS 2.0 base score of 7.2, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

The _rtld function in the Run-Time Link-Editor (rtld) in libexec/rtld-elf/rtld.c in FreeBSD 7.1, 7.2, and 8.0 does not clear the LD_PRELOAD environment variable, which allows local users to gain privileges by executing a setuid or setguid program with a modified LD_PRELOAD variable containing an untrusted search path that points to a Trojan horse library, a different vector than CVE-2009-4147.

Remediation

Check the references section for vendor advisories and patches from freebsd. Update freebsd to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus

References

Refpacketstormsecurity.com/files/152997/FreeBSD-rtld-execl-Privilege-Escalation.htmlRefpeople.freebsd.org/~cperciva/rtld.patchRefsecunia.com/advisories/37517Refwww.securityfocus.com/archive/1/508142/100/0/threadedRefwww.securityfocus.com/archive/1/508146/100/0/threadedRefwww.securityfocus.com/archive/1/508168/100/0/threadedRefwww.securityfocus.com/bid/37154Refwww.securitytracker.com/id?1023250Refpacketstormsecurity.com/files/152997/FreeBSD-rtld-execl-Privilege-Escalation.htmlRefpeople.freebsd.org/~cperciva/rtld.patch

How CyberStrike helps

Frequently asked questions

What is CVE-2009-4146?

CVE-2009-4146 is a high-severity vulnerability affecting freebsd freebsd. It was published on December 2, 2009 and has a CVSS 2.0 base score of 7.2 (HIGH).

How severe is CVE-2009-4146?

This vulnerability has a CVSS 2.0 base score of 7.2, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2009-4146?

Check the references section for vendor advisories and patches from freebsd. Update freebsd to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2009-4146?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2009-4146 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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