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FreeBSD : FreeBSD -- Mishandling of x86 debug exceptions (521ce804-52fd-11e8-9123-a4badb2f4699)

high Nessus Plugin ID 109625

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Synopsis

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

Description

The MOV SS and POP SS instructions inhibit debug exceptions until the instruction boundary following the next instruction. If that instruction is a system call or similar instruction that transfers control to the operating system, the debug exception will be handled in the kernel context instead of the user context. Impact : An authenticated local attacker may be able to read sensitive data in kernel memory, control low-level operating system functions, or may panic the system.

Solution

Update the affected packages.

See Also

http://www.nessus.org/u?69624daa

Plugin Details

Severity: High

ID: 109625

File Name: freebsd_pkg_521ce80452fd11e89123a4badb2f4699.nasl

Version: 1.11

Type: local

Published: 5/9/2018

Updated: 4/5/2019

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Critical

Score: 9.6

CVSS v2

Risk Factor: High

Base Score: 7.2

Temporal Score: 6.3

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

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 7.5

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

Temporal Vector: CVSS:3.0/E:H/RL:O/RC:C

Vulnerability Information

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

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 5/8/2018

Vulnerability Publication Date: 5/8/2018

Exploitable With

Metasploit (Microsoft Windows POP/MOV SS Local Privilege Elevation Vulnerability)

Reference Information

CVE: CVE-2018-8897

FreeBSD: SA-18:06.debugreg