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FreeBSD : FreeBSD -- File description reference count leak (86c89abf-2d91-11e9-bf3e-a4badb2f4699)

high Nessus Plugin ID 122085

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Synopsis

The remote FreeBSD host is missing a security-related update.

Description

FreeBSD 12.0 attempts to handle the case where the receiving process does not provide a sufficiently large buffer for an incoming control message containing rights. In particular, to avoid leaking the corresponding descriptors into the receiving process' descriptor table, the kernel handles the truncation case by closing descriptors referenced by the discarded message.

The code which performs this operation failed to release a reference obtained on the file corresponding to a received right. This bug can be used to cause the reference counter to wrap around and free the file structure. Impact : A local user can exploit the bug to gain root privileges or escape from a jail.

Solution

Update the affected package.

See Also

http://www.nessus.org/u?fe9fe685

Plugin Details

Severity: High

ID: 122085

File Name: freebsd_pkg_86c89abf2d9111e9bf3ea4badb2f4699.nasl

Version: 1.6

Type: local

Published: 2/11/2019

Updated: 2/12/2020

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.3

CVSS v2

Risk Factor: High

Base Score: 7.2

Temporal Score: 5.6

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

CVSS Score Source: CVE-2019-5596

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.9

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

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

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 2/11/2019

Vulnerability Publication Date: 2/5/2019

Reference Information

CVE: CVE-2019-5596

FreeBSD: SA-19:02.fd