Amazon Linux 2 : c-ares (ALAS-2024-2646)

medium Nessus Plugin ID 208103

Synopsis

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

Description

The version of c-ares installed on the remote host is prior to 1.19.1-1. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2024-2646 advisory.

Insufficient randomness in generation of DNS query IDs

When /dev/urandom or RtlGenRandom() are unavailable, c-ares uses rand() to generate random numbers used for DNS query ids. This is not a CSPRNG, and it is also not seeded by srand() so will generate predictable output.Input from the random number generator is fed into a non-compilant RC4 implementation and may not be as strong as the original RC4 implementation.No attempt is made to look for modern OS-provided CSPRNGs like arc4random() that is widely available. (CVE-2023-31147)

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

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 c-ares' to update your system.

Plugin Details

Severity: Medium

ID: 208103

File Name: al2_ALAS-2024-2646.nasl

Version: 1.1

Type: local

Agent: unix

Family: Amazon Linux Local Security Checks

Published: 10/3/2024

Updated: 10/3/2024

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

Risk Information

VPR

Risk Factor: Low

Score: 2.5

CVSS v2

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 4.7

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

CVSS Score Source: CVE-2023-31147

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.7

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

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

Vulnerability Information

CPE: cpe:/o:amazon:linux:2, p-cpe:/a:amazon:linux:c-ares, p-cpe:/a:amazon:linux:c-ares-debuginfo, p-cpe:/a:amazon:linux:c-ares-devel

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

Exploit Ease: No known exploits are available

Patch Publication Date: 9/25/2024

Vulnerability Publication Date: 5/24/2023

Reference Information

CVE: CVE-2023-31147

Detections

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