Amazon Linux 2 : systemd (ALAS-2021-1647)

high Nessus Plugin ID 150993

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Synopsis

The remote Amazon Linux 2 host is missing a security update.

Description

The version of systemd installed on the remote host is prior to 219-78. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2021-1647 advisory.

- A vulnerability in unit_deserialize of systemd allows an attacker to supply arbitrary state across systemd re-execution via NotifyAccess. This can be used to improperly influence systemd execution and possibly lead to root privilege escalation. Affected releases are systemd versions up to and including 239.
(CVE-2018-15686)

- An allocation of memory without limits, that could result in the stack clashing with another memory region, was discovered in systemd-journald when a program with long command line arguments calls syslog. A local attacker may use this flaw to crash systemd-journald or escalate his privileges. Versions through v240 are vulnerable. (CVE-2018-16864)

- An out of bounds read was discovered in systemd-journald in the way it parses log messages that terminate with a colon ':'. A local attacker can use this flaw to disclose process memory data. Versions from v221 to v239 are vulnerable. (CVE-2018-16866)

- An issue was discovered in button_open in login/logind-button.c in systemd before 243. When executing the udevadm trigger command, a memory leak may occur. (CVE-2019-20386)

- A memory leak was discovered in the backport of fixes for CVE-2018-16864 in Red Hat Enterprise Linux.
Function dispatch_message_real() in journald-server.c does not free the memory allocated by set_iovec_field_free() to store the `_CMDLINE=` entry. A local attacker may use this flaw to make systemd- journald crash. This issue only affects versions shipped with Red Hat Enterprise since v219-62.2.
(CVE-2019-3815)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Run 'yum update systemd' to update your system.

See Also

https://alas.aws.amazon.com/AL2/ALAS-2021-1647.html

https://access.redhat.com/security/cve/CVE-2018-15686

https://access.redhat.com/security/cve/CVE-2018-16866

https://access.redhat.com/security/cve/CVE-2019-20386

https://access.redhat.com/security/cve/CVE-2019-3815

Plugin Details

Severity: High

ID: 150993

File Name: al2_ALAS-2021-1647.nasl

Version: 1.4

Type: local

Agent: unix

Published: 6/24/2021

Updated: 7/30/2021

Dependencies: ssh_get_info.nasl

Risk Information

CVSS Score Source: CVE-2018-15686

VPR

Risk Factor: High

Score: 7.4

CVSS v2

Risk Factor: High

Base Score: 7.2

Temporal Score: 5.6

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

Temporal Vector: E:POC/RL:OF/RC:C

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 7

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

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

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:libgudev1, p-cpe:/a:amazon:linux:libgudev1-devel, p-cpe:/a:amazon:linux:systemd, p-cpe:/a:amazon:linux:systemd-debuginfo, p-cpe:/a:amazon:linux:systemd-devel, p-cpe:/a:amazon:linux:systemd-journal-gateway, p-cpe:/a:amazon:linux:systemd-libs, p-cpe:/a:amazon:linux:systemd-networkd, p-cpe:/a:amazon:linux:systemd-python, p-cpe:/a:amazon:linux:systemd-resolved, p-cpe:/a:amazon:linux:systemd-sysv, cpe:/o:amazon:linux:2

Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 6/16/2021

Vulnerability Publication Date: 10/26/2018

Reference Information

CVE: CVE-2018-15686, CVE-2018-16864, CVE-2018-16866, CVE-2019-3815, CVE-2019-20386

ALAS: 2021-1647