SB2016052503 - Buffer overflow in FreeBSD

Description

This security bulletin contains information about 1 security vulnerability.

1) Buffer overflow (CVE-ID: CVE-2016-1886)

The vulnerability allows a local authenticated user to execute arbitrary code.

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."

Remediation

Install update from vendor's website.

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