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Amazon Linux 2 : krb5, --advisory ALAS2-2025-2985 (ALAS-2025-2985)

medium Nessus Plugin ID 261347

Synopsis

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

Description

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2025-2985 advisory.

 krb5: overflow when calculating ulog block size (CVE-2025-24528)

 A vulnerability in the MIT Kerberos implementation allows GSSAPI-protected messages using RC4-HMAC-MD5 to be spoofed due to weaknesses in the MD5 checksum design. If RC4 is preferred over stronger encryption types, an attacker could exploit MD5 collisions to forge message integrity codes. This may lead to unauthorized message tampering. (CVE-2025-3576)

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 krb5' or or 'yum update --advisory ALAS2-2025-2985' to update your system.

See Also

https://alas.aws.amazon.com//AL2/ALAS2-2025-2985.html

https://alas.aws.amazon.com/faqs.html

https://explore.alas.aws.amazon.com/CVE-2025-24528.html

https://explore.alas.aws.amazon.com/CVE-2025-3576.html

Plugin Details

Severity: Medium

ID: 261347

File Name: al2_ALAS-2025-2985.nasl

Version: 1.1

Type: local

Agent: unix

Published: 9/4/2025

Updated: 9/4/2025

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

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 5.4

Temporal Score: 4

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

CVSS Score Source: CVE-2025-3576

CVSS v3

Risk Factor: Medium

Base Score: 5.9

Temporal Score: 5.2

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

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

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:krb5-pkinit, p-cpe:/a:amazon:linux:krb5-devel, p-cpe:/a:amazon:linux:krb5-debuginfo, p-cpe:/a:amazon:linux:libkadm5, p-cpe:/a:amazon:linux:krb5-workstation, cpe:/o:amazon:linux:2, p-cpe:/a:amazon:linux:krb5-server, p-cpe:/a:amazon:linux:krb5-server-ldap, p-cpe:/a:amazon:linux:krb5-libs

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

Exploit Ease: No known exploits are available

Patch Publication Date: 9/4/2025

Vulnerability Publication Date: 2/12/2025

Reference Information

CVE: CVE-2025-24528, CVE-2025-3576