SUSE SLED15 / SLES15 Security Update : c-ares (SUSE-SU-2021:2760-1)

medium Nessus Plugin ID 152650

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Synopsis

The remote SUSE host is missing a security update.

Description

The remote SUSE Linux SLED15 / SLES15 / SLES_SAP15 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2021:2760-1 advisory.

Version update to git snapshot 1.17.1+20200724:

- CVE-2021-3672: fixed missing input validation on hostnames returned by DNS servers (bsc#1188881)
- If ares_getaddrinfo() was terminated by an ares_destroy(), it would cause crash
- Crash in sortaddrinfo() if the list size equals 0 due to an unexpected DNS response
- Expand number of escaped characters in DNS replies as per RFC1035 5.1 to prevent spoofing
- Use unbuffered /dev/urandom for random data to prevent early startup performance issues

Tenable has extracted the preceding description block directly from the SUSE 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 c-ares-devel and / or libcares2 packages.

Plugin Details

Severity: Medium

ID: 152650

File Name: suse_SU-2021-2760-1.nasl

Version: 1.6

Type: Local

Agent: unix

Family: SuSE Local Security Checks

Published: 8/18/2021

Updated: 6/25/2026

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 2.8

Percentile: 22.22

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5.3

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

CVSS Score Source: CVE-2021-3672

CVSS v3

Risk Factor: Medium

Base Score: 5.6

Temporal Score: 5.1

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

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

Vulnerability Information

CPE: p-cpe:/a:novell:suse_linux:c-ares-devel, cpe:/o:novell:suse_linux:15, p-cpe:/a:novell:suse_linux:libcares2

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 8/17/2021

Vulnerability Publication Date: 8/13/2021

Reference Information

CVE: CVE-2021-3672

SuSE: SUSE-SU-2021:2760-1

Detections

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