FreeBSD : FreeBSD -- Local privilege escalation in IRET handler (0dfa5dde-600a-11e6-a6c3-14dae9d210b8)

High Nessus Plugin ID 92895


The remote FreeBSD host is missing one or more security-related updates.


If the kernel-mode IRET instruction generates an #SS or #NP exception, but the exception handler does not properly ensure that the right GS register base for kernel is reloaded, the userland GS segment may be used in the context of the kernel exception handler. Impact : By causing an IRET with #SS or #NP exceptions, a local attacker can cause the kernel to use an arbitrary GS base, which may allow escalated privileges or panic the system.


Update the affected packages.

See Also

Plugin Details

Severity: High

ID: 92895

File Name: freebsd_pkg_0dfa5dde600a11e6a6c314dae9d210b8.nasl

Version: $Revision: 2.3 $

Type: local

Published: 2016/08/12

Modified: 2018/01/31

Dependencies: 12634

Risk Information

Risk Factor: High


Base Score: 7.2

Vector: CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C


Base Score: 7.8

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

Vulnerability Information

CPE: p-cpe:/a:freebsd:freebsd:FreeBSD-kernel, cpe:/o:freebsd:freebsd

Required KB Items: Host/local_checks_enabled, Host/FreeBSD/release, Host/FreeBSD/pkg_info, Settings/ParanoidReport

Patch Publication Date: 2016/08/11

Vulnerability Publication Date: 2015/08/25

Reference Information

CVE: CVE-2015-5675

FreeBSD: SA-15:21.amd64