Detections
Analytics
Amazon Linux 2023 : composer (ALAS2023-2026-3136)
high Nessus Plugin ID 351112
Synopsis
The remote Amazon Linux 2023 host is missing a security update.Description
It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-3136 advisory.Package bin path can escape the package directory, bypassing the GHSA-gjfg-22fp-rrxx fix. A malicious or compromised Composer package could, when installed as a dependency, cause Composer to change the permissions of a file outside that package's own directory and to register a runnable vendor/bin command that points at that outside file. This is a path traversal and link following issue. It is not remote code execution, the attacker gains no ability to read or receive your data directly. The risk is that a file which was readable only by its owner, but modifiable by Composer, can be made world readable and executable, which is enough to expose its contents on a shared or multi tenant host. The earlier hardening from GHSA-gjfg-22fp-rrxx can be bypassed, since it only rejected literal .. path segments in a package's declared binaries, and was only applied in a single place during dependency resolution. (CVE-2026-59944)
Composer is a dependency Manager for the PHP language. From 1.0 until 2.2.30 and 2.10.3, a malicious dependency package from a custom Composer repository or an untrusted composer.lock file could set source.type to perforce and source.url to an rsh: or jsh: P4PORT value. When the Perforce p4 client was installed and Composer installed the package from source through composer install or composer update, including --prefer-source, Composer\Util\Perforce passed the address to p4 without validation, causing p4 to run a local command with the privileges of the user or CI account. Packagist.org does not permit Perforce source metadata. This issue is fixed in versions 2.2.30 and 2.10.3. (CVE-2026-84361)
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 'dnf update composer --releasever 2023.12.20260928' or or 'dnf update --advisory ALAS2023-2026-3136 --releasever 2023.12.20260928' to update your system.See Also
https://alas.aws.amazon.com//AL2023/ALAS2023-2026-3136.html
https://alas.aws.amazon.com/faqs.html
Plugin Details
Severity: High
ID: 351112
File Name: al2023_ALAS2023-2026-3136.nasl
Version: 1.1
Type: Local
Agent: unix
Published: 9/29/2026
Updated: 9/29/2026
Supported Sensors: Nessus Agent, Continuous Assessment, Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 6.9
Percentile: 96.53
CVSS v2
Risk Factor: Medium
Base Score: 6.8
Temporal Score: 5.3
Vector: CVSS2#AV:L/AC:L/Au:S/C:C/I:C/A:C
CVSS Score Source: CVE-2026-84361
CVSS v3
Risk Factor: Medium
Base Score: 6.1
Temporal Score: 5.5
Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N
Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C
CVSS Score Source: CVE-2026-59944
CVSS v4
Risk Factor: High
Base Score: 7.7
Threat Score: 6.8
Threat Vector: CVSS:4.0/E:P
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Vulnerability Information
CPE: cpe:/o:amazon:linux:2023, p-cpe:/a:amazon:linux:composer
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: 9/29/2026
Vulnerability Publication Date: 8/27/2026
Reference Information
CVE: CVE-2026-59944, CVE-2026-84361