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CVE-2016-1886

Status Candidate

Overview

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."

Related Files

FreeBSD Security Advisory - FreeBSD-SA-16:18.atkbd
Posted May 18, 2016
Authored by CTurt and the HardenedBSD team | Site security.freebsd.org

FreeBSD Security Advisory - Incorrect signedness comparison in the ioctl(2) handler allows a malicious local user to overwrite a portion of the kernel memory. A local user may crash the kernel, read a portion of kernel memory and execute arbitrary code in kernel context. The result of executing an arbitrary kernel code is privilege escalation.

tags | advisory, arbitrary, kernel, local
systems | freebsd
advisories | CVE-2016-1886
SHA-256 | c7c48a6a99a2c6c01b08b27fe32854f8e9e9d8b0f9221e5d0765b78ae72824fc
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