Amazon Linux 2 : dbus (ALAS-2022-1870)

high Nessus Plugin ID 167227

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Synopsis

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

Description

The version of dbus installed on the remote host is prior to 1.10.24-7. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2022-1870 advisory.

A flaw was found in dbus. The implementation of DBUS_COOKIE_SHA1 is susceptible to a symbolic link attack.
A malicious client with write access to its own home directory could manipulate a ~/.dbus-keyrings symlink to cause the DBusServer to read and write in unintended locations resulting in an authentication bypass.
The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability. (CVE-2019-12749)

An uncontrolled resource consumption vulnerability was discovered in D-Bus. The DBusServer leaks file descriptors when a message exceeds the per-message file descriptor limit. This flaw allows a local attacker with access to the D-Bus system bus or another system service's private AF_UNIX socket, to make the system service reach its file descriptor limit, denying service to subsequent D-Bus clients. As a result, the system may become unusable for other users, and some services may stop working. The highest threat from this vulnerability is to system availability. (CVE-2020-12049)

Tenable has extracted the preceding description block directly from the tested product security advisory.

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

Solution

Run 'yum update dbus' to update your system.

Plugin Details

Severity: High

ID: 167227

File Name: al2_ALAS-2022-1870.nasl

Version: 1.4

Type: local

Agent: unix

Family: Amazon Linux Local Security Checks

Published: 11/9/2022

Updated: 12/11/2024

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.0

CVSS v2

Risk Factor: Low

Base Score: 3.6

Temporal Score: 2.8

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

CVSS Score Source: CVE-2019-12749

CVSS v3

Risk Factor: High

Base Score: 7.1

Temporal Score: 6.4

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

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

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:dbus-libs, p-cpe:/a:amazon:linux:dbus-debuginfo, p-cpe:/a:amazon:linux:dbus, p-cpe:/a:amazon:linux:dbus-doc, p-cpe:/a:amazon:linux:dbus-x11, p-cpe:/a:amazon:linux:dbus-tests, p-cpe:/a:amazon:linux:dbus-devel, 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: 10/31/2022

Vulnerability Publication Date: 6/11/2019

Reference Information

CVE: CVE-2019-12749, CVE-2020-12049

Detections

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