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Ubuntu 24.10 / 25.04 : c-ares vulnerability (USN-7477-1)

high Nessus Plugin ID 235139

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Synopsis

The remote Ubuntu host is missing a security update.

Description

The remote Ubuntu 24.10 / 25.04 host has packages installed that are affected by a vulnerability as referenced in the USN-7477-1 advisory.

 It was discovered that c-ares incorrectly handled re-enqueuing certain queries. A remote attacker could possibly use this issue to cause c-ares to crash, resulting in a denial of service.

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 libc-ares-dev, libc-ares2 and / or libcares2 packages.

See Also

https://ubuntu.com/security/notices/USN-7477-1

Plugin Details

Severity: High

ID: 235139

File Name: ubuntu_USN-7477-1.nasl

Version: 1.1

Type: local

Agent: unix

Published: 5/5/2025

Updated: 5/5/2025

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: 5.5

CVSS v2

Risk Factor: Medium

Base Score: 6.6

Temporal Score: 4.9

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

CVSS Score Source: CVE-2025-31498

CVSS v3

Risk Factor: High

Base Score: 7

Temporal Score: 6.1

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

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

CVSS v4

Risk Factor: High

Base Score: 8.3

Threat Score: 4.9

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:25.04, p-cpe:/a:canonical:ubuntu_linux:libcares2, p-cpe:/a:canonical:ubuntu_linux:libc-ares2, cpe:/o:canonical:ubuntu_linux:24.10, p-cpe:/a:canonical:ubuntu_linux:libc-ares-dev

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

Exploit Ease: No known exploits are available

Patch Publication Date: 5/5/2025

Vulnerability Publication Date: 4/8/2025

Reference Information

CVE: CVE-2025-31498

USN: 7477-1