What’s Vulnerable › Vulnerabilities
CVE-2006-6730
- Severity: medium (CVSS 6.6 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: 2006-12-26 · updated 2026-06-16
Description
OpenBSD and NetBSD permit usermode code to kill the display server and write to the X.Org /dev/xf86 device, which allows local users with root privileges to reduce securelevel by replacing the System Management Mode (SMM) handler via a write to an SMRAM address within /dev/xf86 (aka the video card memory-mapped I/O range), and then launching the new handler via a System Management Interrupt (SMI), as demonstrated by a write to Programmed I/O port 0xB2.
Affected products
References
- http://lists.freedesktop.org/archives/xorg/2004-June/000927.html
- http://www.cansecwest.com/slides06/csw06-duflot.ppt
- http://www.securityfocus.com/archive/1/454379/100/0/threaded
- http://www.securityfocus.com/archive/1/454510/100/0/threaded
- http://www.securityfocus.com/archive/1/454706/100/0/threaded
- http://www.ssi.gouv.fr/fr/sciences/fichiers/lti/cansecwest2006-duflot-paper.pdf
- http://lists.freedesktop.org/archives/xorg/2004-June/000927.html
- http://www.cansecwest.com/slides06/csw06-duflot.ppt
- http://www.securityfocus.com/archive/1/454379/100/0/threaded
- http://www.securityfocus.com/archive/1/454510/100/0/threaded
- http://www.securityfocus.com/archive/1/454706/100/0/threaded
- http://www.ssi.gouv.fr/fr/sciences/fichiers/lti/cansecwest2006-duflot-paper.pdf
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