Debian DSA-4484-1 : linux - security update

High Nessus Plugin ID 126837

Synopsis

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

Description

Jann Horn discovered that the ptrace subsystem in the Linux kernel mishandles the management of the credentials of a process that wants to create a ptrace relationship, allowing a local user to obtain root privileges under certain scenarios.

Solution

Upgrade the linux packages.

For the oldstable distribution (stretch), this problem has been fixed in version 4.9.168-1+deb9u4.

For the stable distribution (buster), this problem has been fixed in version 4.19.37-5+deb10u1. This update includes as well a patch for a regression introduced by the original fix for CVE-2019-11478 (#930904).

See Also

https://security-tracker.debian.org/tracker/CVE-2019-11478

https://security-tracker.debian.org/tracker/source-package/linux

https://packages.debian.org/source/stretch/linux

https://packages.debian.org/source/buster/linux

https://www.debian.org/security/2019/dsa-4484

Plugin Details

Severity: High

ID: 126837

File Name: debian_DSA-4484.nasl

Version: 1.5

Type: local

Agent: unix

Published: 2019/07/22

Updated: 2019/09/24

Dependencies: 12634

Risk Information

Risk Factor: High

CVSS v2.0

Base Score: 7.2

Temporal Score: 6.3

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

Temporal Vector: CVSS2#E:H/RL:OF/RC:C

CVSS v3.0

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:debian:debian_linux:linux, cpe:/o:debian:debian_linux:10.0, cpe:/o:debian:debian_linux:9.0

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 2019/07/20

Vulnerability Publication Date: 2019/07/17

Reference Information

CVE: CVE-2019-13272

DSA: 4484