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Ubuntu 16.04 ESM / 18.04 LTS / 20.04 LTS : Ruby vulnerabilities (USN-5235-1)

critical Nessus Plugin ID 156802

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Synopsis

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

Description

The remote Ubuntu 16.04 ESM / 18.04 LTS / 20.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-5235-1 advisory.

 It was discovered that Ruby incorrectly handled certain HTML files. An attacker could possibly use this issue to cause a crash. This issue only affected Ubuntu 20.04 LTS, Ubuntu 21.04, and Ubuntu 21.10.
 (CVE-2021-41816)

 It was discovered that Ruby incorrectly handled certain regular expressions. An attacker could possibly use this issue to cause a regular expression denial of service. (CVE-2021-41817)

 It was discovered that Ruby incorrectly handled certain cookie names. An attacker could possibly use this issue to access or expose sensitive information. (CVE-2021-41819)

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 packages.

See Also

https://ubuntu.com/security/notices/USN-5235-1

Plugin Details

Severity: Critical

ID: 156802

File Name: ubuntu_USN-5235-1.nasl

Version: 1.8

Type: local

Agent: unix

Published: 1/18/2022

Updated: 8/29/2024

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: 6.7

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 5.9

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

CVSS Score Source: CVE-2021-41816

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.8

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:P/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:canonical:ubuntu_linux:ruby2.3-dev, p-cpe:/a:canonical:ubuntu_linux:ruby2.5, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:ruby2.3-tcltk, p-cpe:/a:canonical:ubuntu_linux:libruby2.5, p-cpe:/a:canonical:ubuntu_linux:ruby2.5-dev, p-cpe:/a:canonical:ubuntu_linux:ruby2.3, p-cpe:/a:canonical:ubuntu_linux:ruby2.7-dev, p-cpe:/a:canonical:ubuntu_linux:libruby2.7, cpe:/o:canonical:ubuntu_linux:16.04:-:esm, p-cpe:/a:canonical:ubuntu_linux:libruby2.3, p-cpe:/a:canonical:ubuntu_linux:ruby2.7

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 1/18/2022

Vulnerability Publication Date: 12/28/2021

Reference Information

CVE: CVE-2021-41816, CVE-2021-41817, CVE-2021-41819

USN: 5235-1