- 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.
- Source
- cve@mitre.org
- NVD status
- Modified
CVSS 2.0
- Type
- Primary
- Base score
- 6.6
- Impact score
- 10
- Exploitability score
- 2.7
- Vector string
- AV:L/AC:M/Au:S/C:C/I:C/A:C
- Hype score
- Not currently trending
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