CVE-2016-1886 Information

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.\

CVSS Vector

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

Reference

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

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

7.8