Overview
- 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
Risk scores
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
Weaknesses
- nvd@nist.gov
- NVD-CWE-Other
Social media
- Hype score
- Not currently trending
Configurations
[
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:o:netbsd:netbsd:2.0.4:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "36419DD6-0DB4-4BB6-A35F-D8FDB89402F1"
},
{
"criteria": "cpe:2.3:o:openbsd:openbsd:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "CA3CDD3C-DBA6-4BA2-967D-AD746822F3CF"
}
],
"operator": "OR"
}
]
}
]