Amazon Linux AMI : yasm (ALAS-2023-1724)

medium Nessus Plugin ID 173934


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


The version of yasm installed on the remote host is prior to 1.2.0-1.5. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS-2023-1724 advisory.

- An issue was discovered in yasm version 1.3.0. There is a NULL pointer dereference in yasm_expr_get_intnum() in libyasm/expr.c. (CVE-2021-33454)

- An issue was discovered in yasm version 1.3.0. There is a NULL pointer dereference in nasm_parser_directive() in modules/parsers/nasm/nasm-parse.c. (CVE-2021-33459)

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


Run 'yum update yasm' to update your system.

See Also

Plugin Details

Severity: Medium

ID: 173934

File Name: ala_ALAS-2023-1724.nasl

Version: 1.1

Type: local

Agent: unix

Published: 4/6/2023

Updated: 4/19/2023

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

Risk Information


Risk Factor: Medium

Score: 4.4


Risk Factor: Medium

Base Score: 4.9

Temporal Score: 3.8

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

CVSS Score Source: CVE-2021-33459


Risk Factor: Medium

Base Score: 5.5

Temporal Score: 5

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

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

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:yasm, p-cpe:/a:amazon:linux:yasm-debuginfo, p-cpe:/a:amazon:linux:yasm-devel, cpe:/o:amazon:linux

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: 3/30/2023

Vulnerability Publication Date: 7/26/2022

Reference Information

CVE: CVE-2021-33454, CVE-2021-33459