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Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS : Kerberos vulnerability (USN-7542-1)

medium Nessus Plugin ID 237448

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Synopsis

The remote Ubuntu host is missing a security update.

Description

The remote Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS host has packages installed that are affected by a vulnerability as referenced in the USN-7542-1 advisory.

 It was discovered that Kerberos allowed the usage of weak cryptographic standards. An attacker could possibly use this issue to expose sensitive information.

 This update introduces the allow_rc4 and allow_des3 configuration options, and disables the usage of RC4 and 3DES ciphers by default. Users are advised to discontinue their usage and upgrade to stronger encryption protocols. If the use of the insecure RC4 and 3DES algorithms is necessary, they can be enabled with the aforementioned configuration options.

Tenable has extracted the preceding description block directly from the Ubuntu 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

Update the affected packages.

See Also

https://ubuntu.com/security/notices/USN-7542-1

Plugin Details

Severity: Medium

ID: 237448

File Name: ubuntu_USN-7542-1.nasl

Version: 1.2

Type: local

Agent: unix

Published: 5/29/2025

Updated: 5/29/2025

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

Risk Information

VPR

Risk Factor: Low

Score: 3.6

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:canonical:ubuntu_linux:krb5-kdc, p-cpe:/a:canonical:ubuntu_linux:krb5-locales, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:libk5crypto3, p-cpe:/a:canonical:ubuntu_linux:libkadm5srv-mit11, p-cpe:/a:canonical:ubuntu_linux:libkrb5-dev, p-cpe:/a:canonical:ubuntu_linux:libkadm5srv-mit9, p-cpe:/a:canonical:ubuntu_linux:krb5-k5tls, p-cpe:/a:canonical:ubuntu_linux:libkrad-dev, p-cpe:/a:canonical:ubuntu_linux:libkdb5-9, p-cpe:/a:canonical:ubuntu_linux:libkrb5support0, p-cpe:/a:canonical:ubuntu_linux:krb5-kdc-ldap, p-cpe:/a:canonical:ubuntu_linux:libkadm5clnt-mit9, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:krb5-otp, p-cpe:/a:canonical:ubuntu_linux:libkadm5srv-mit12, p-cpe:/a:canonical:ubuntu_linux:libkdb5-10, p-cpe:/a:canonical:ubuntu_linux:libkadm5clnt-mit12, p-cpe:/a:canonical:ubuntu_linux:libgssrpc4, p-cpe:/a:canonical:ubuntu_linux:libkadm5srv-mit8, cpe:/o:canonical:ubuntu_linux:14.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:libgssrpc4t64, p-cpe:/a:canonical:ubuntu_linux:libkrb5-3, p-cpe:/a:canonical:ubuntu_linux:krb5-multidev, p-cpe:/a:canonical:ubuntu_linux:krb5-pkinit, p-cpe:/a:canonical:ubuntu_linux:krb5-user, p-cpe:/a:canonical:ubuntu_linux:krb5-kpropd, p-cpe:/a:canonical:ubuntu_linux:libgssapi-krb5-2, p-cpe:/a:canonical:ubuntu_linux:libkdb5-7, cpe:/o:canonical:ubuntu_linux:16.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:krb5-admin-server, p-cpe:/a:canonical:ubuntu_linux:libkdb5-8, p-cpe:/a:canonical:ubuntu_linux:libkdb5-10t64, p-cpe:/a:canonical:ubuntu_linux:krb5-gss-samples, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:libkrad0, p-cpe:/a:canonical:ubuntu_linux:libkadm5clnt-mit11

Required KB Items: Host/cpu, Host/Debian/dpkg-l, Host/Ubuntu, Host/Ubuntu/release

Exploit Ease: No known exploits are available

Patch Publication Date: 5/28/2025

Vulnerability Publication Date: 4/15/2025

Reference Information

CVE: CVE-2025-3576

USN: 7542-1