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

high Nessus Plugin ID 92895

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Synopsis

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

Description

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.

Solution

Update the affected packages.

Plugin Details

Severity: High

ID: 92895

File Name: freebsd_pkg_0dfa5dde600a11e6a6c314dae9d210b8.nasl

Version: 2.6

Type: local

Family: FreeBSD Local Security Checks

Published: 8/12/2016

Updated: 1/4/2021

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: High

Base Score: 7.2

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

CVSS v3

Risk Factor: High

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, cpe:/o:freebsd:freebsd

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

Patch Publication Date: 8/11/2016

Vulnerability Publication Date: 8/25/2015

Reference Information

CVE: CVE-2015-5675

FreeBSD: SA-15:21.amd64

Detections

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