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Ubuntu 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS : CryptX vulnerabilities (USN-8128-1)

critical Nessus Plugin ID 304013

Synopsis

The remote Ubuntu host is missing one or more security updates.

Description

The remote Ubuntu 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-8128-1 advisory.

 It was discovered that CryptX did not verify authentication tags while performing GCM and ChaCha20-Poly1305 decryption. An attacker could possibly use this issue to cause CryptX to accept modified ciphertext, leading to data integrity violations or authentication bypass. This issue only affected Ubuntu 18.04 LTS. (CVE-2018-25099)

 It was discovered that CryptX included a version of the tomcrypt library that was susceptible to malformed unicode handling. An attacker could possibly use this issue to cause unexpected behavior or incorrect processing of crafted input. This issue only affected Ubuntu 18.04 LTS. (CVE-2025-40912)

 It was discovered that CryptX included a version of the libtommath library that was susceptible to an integer overflow. An attacker could possibly use this issue to cause memory corruption or a denial of service. (CVE-2025-40914)

Tenable has extracted the preceding description block directly from the Ubuntu 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

Update the affected libcryptx-perl package.

See Also

https://ubuntu.com/security/notices/USN-8128-1

Plugin Details

Severity: Critical

ID: 304013

File Name: ubuntu_USN-8128-1.nasl

Version: 1.1

Type: local

Agent: unix

Published: 3/27/2026

Updated: 3/27/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

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

CVSS Score Source: CVE-2025-40914

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

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

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

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:20.04:-:lts, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:libcryptx-perl, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, cpe:/o:canonical:ubuntu_linux:22.04:-:lts

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

Exploit Ease: No known exploits are available

Patch Publication Date: 3/26/2026

Vulnerability Publication Date: 3/18/2024

Reference Information

CVE: CVE-2018-25099, CVE-2025-40912, CVE-2025-40914

USN: 8128-1