CVE-2016-1886

HIGH

Description

Integer signedness error in the genkbd_commonioctl function in sys/dev/kbd/kbd.c in FreeBSD 9.3 before p42, 10.1 before p34, 10.2 before p17, and 10.3 before p3 allows local users to obtain sensitive information from kernel memory, cause a denial of service (memory overwrite and kernel crash), or gain privileges via a negative value in the flen structure member in the arg argument in a SETFKEY ioctl call, which triggers a "two way heap and stack overflow."

References

http://cturt.github.io/SETFKEY.html

http://www.securityfocus.com/bid/90734

http://www.securitytracker.com/id/1035905

https://security.FreeBSD.org/patches/SA-16:18/atkbd.patch

https://www.freebsd.org/security/advisories/FreeBSD-SA-16:18.atkbd.asc

Details

Source: MITRE

Published: 2016-05-25

Updated: 2017-04-20

Type: CWE-119

Risk Information

CVSS v2.0

Base Score: 7.2

Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C

Impact Score: 10

Exploitability Score: 3.9

Severity: HIGH

CVSS v3.0

Base Score: 7.8

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Impact Score: 5.9

Exploitability Score: 1.8

Severity: HIGH