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Amazon Linux AMI : dbus (ALAS-2019-1246)

high Nessus Plugin ID 127074

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Synopsis

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

Description

dbus as used in DBusServer, allows cookie spoofing because of symlink mishandling in the reference implementation of DBUS_COOKIE_SHA1 in the libdbus library. (This only affects the DBUS_COOKIE_SHA1 authentication mechanism.) A malicious client with write access to its own home directory could manipulate a ~/.dbus-keyrings symlink to cause a DBusServer with a different uid to read and write in unintended locations. In the worst case, this could result in the DBusServer reusing a cookie that is known to the malicious client, and treating that cookie as evidence that a subsequent client connection came from an attacker-chosen uid, allowing authentication bypass.
(CVE-2019-12749)

Solution

Run 'yum update dbus' to update your system.

See Also

https://alas.aws.amazon.com/ALAS-2019-1246.html

Plugin Details

Severity: High

ID: 127074

File Name: ala_ALAS-2019-1246.nasl

Version: 1.3

Type: local

Agent: unix

Published: 7/26/2019

Updated: 5/8/2024

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

Risk Information

VPR

Risk Factor: Medium

Score: 6.0

CVSS v2

Risk Factor: Low

Base Score: 3.6

Temporal Score: 2.7

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: 6.2

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:U/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-devel, cpe:/o:amazon:linux

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

Exploit Ease: No known exploits are available

Patch Publication Date: 7/25/2019

Vulnerability Publication Date: 6/11/2019

Reference Information

CVE: CVE-2019-12749

ALAS: 2019-1246