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Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS : Sudo vulnerabilities (USN-4705-1)

high Nessus Plugin ID 145463

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Synopsis

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

Description

The remote Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 20.10 host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-4705-1 advisory.

 - Sudo before 1.9.5p2 has a Heap-based Buffer Overflow, allowing privilege escalation to root via sudoedit
 -s and a command-line argument that ends with a single backslash character: (CVE-2021-3156)

 - The sudoedit personality of Sudo before 1.9.5 may allow a local unprivileged user to perform arbitrary directory-existence tests by winning a sudo_edit.c race condition in replacing a user-controlled directory by a symlink to an arbitrary path. (CVE-2021-23239)

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 sudo and / or sudo-ldap packages.

See Also

https://ubuntu.com/security/notices/USN-4705-1

Plugin Details

Severity: High

ID: 145463

File Name: ubuntu_USN-4705-1.nasl

Version: 1.13

Type: local

Agent: unix

Published: 1/27/2021

Updated: 10/16/2023

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

Risk Information

VPR

Risk Factor: Critical

Score: 9.7

CVSS v2

Risk Factor: High

Base Score: 7.2

Temporal Score: 6.3

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

CVSS Score Source: CVE-2021-3156

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 7.5

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

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

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:16.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:sudo, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:sudo-ldap, cpe:/o:canonical:ubuntu_linux:20.04:-:lts

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 1/26/2021

Vulnerability Publication Date: 1/12/2021

CISA Known Exploited Vulnerability Due Dates: 4/27/2022

Exploitable With

CANVAS (CANVAS)

Core Impact

Metasploit (Sudo Heap-Based Buffer Overflow)

Reference Information

CVE: CVE-2021-23239, CVE-2021-3156

IAVA: 2021-A-0053

USN: 4705-1