CVE-2009-4146
First published: Wed Dec 02 2009(Updated: )
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.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| FreeBSD Kernel | =8.0 | |
| FreeBSD Kernel | =7.1 | |
| FreeBSD Kernel | =7.2 |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
- http://www.securityfocus.com/archive/1/508168/100/0/threaded
- http://www.securitytracker.com/id?1023250
- http://www.securityfocus.com/bid/37154
- http://secunia.com/advisories/37517
- http://people.freebsd.org/~cperciva/rtld.patch
- http://www.securityfocus.com/archive/1/508146/100/0/threaded
- http://www.securityfocus.com/archive/1/508142/100/0/threaded
- http://packetstormsecurity.com/files/152997/FreeBSD-rtld-execl-Privilege-Escalation.html
Frequently Asked Questions
What is the severity of CVE-2009-4146?
CVE-2009-4146 is classified as a high severity vulnerability due to its potential to allow local users to gain elevated privileges.
How do I fix CVE-2009-4146?
To fix CVE-2009-4146, you should upgrade to a patched version of FreeBSD that addresses this vulnerability.
Who is affected by CVE-2009-4146?
CVE-2009-4146 affects users of FreeBSD versions 7.1, 7.2, and 8.0.
What type of vulnerability is CVE-2009-4146?
CVE-2009-4146 is a local privilege escalation vulnerability in the Run-Time Link-Editor.
What can exploit CVE-2009-4146?
CVE-2009-4146 can be exploited by executing a setuid or setguid program with a modified LD_PRELOAD variable.
- agent/references
- agent/type
- agent/softwarecombine
- collector/mitre-cve
- source/MITRE
- agent/severity
- agent/author
- agent/weakness
- agent/last-modified-date
- agent/event
- agent/description
- agent/first-publish-date
- agent/source
- agent/tags
- collector/nvd-historical
- agent/software-canonical-lookup-request
- collector/nvd-index
- vendor/freebsd
- canonical/freebsd kernel
- version/freebsd kernel/8.0
- version/freebsd kernel/7.1
- version/freebsd kernel/7.2