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.
History

No history.

cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2006-12-26T23:00:00

Updated: 2024-08-07T20:34:00.547Z

Reserved: 2006-12-26T00:00:00

Link: CVE-2006-6730

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2006-12-26T23:28:00.000

Modified: 2024-11-21T00:23:30.530

Link: CVE-2006-6730

cve-icon Redhat

No data.