Detections
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Ubuntu 18.04 ESM : AsyncSSH vulnerability (USN-4854-1)

critical Nessus Plugin ID 183148

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Synopsis

The remote Ubuntu host is missing a security update.

Description

The remote Ubuntu 18.04 ESM host has a package installed that is affected by a vulnerability as referenced in the USN-4854-1 advisory.

 Matthijs Kooijman discovered that AsyncSSH server did not properly handle authentication under certain conditions. An attacker with a specially crafted client could use this vulnerability to skip authentication of SSH sessions.

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 python3-asyncssh package.

See Also

https://ubuntu.com/security/notices/USN-4854-1

Plugin Details

Severity: Critical

ID: 183148

File Name: ubuntu_USN-4854-1.nasl

Version: 1.1

Type: local

Agent: unix

Published: 10/16/2023

Updated: 8/27/2024

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

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 5.5

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

CVSS Score Source: CVE-2018-7749

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:18.04:-:esm, p-cpe:/a:canonical:ubuntu_linux:python3-asyncssh

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

Exploit Ease: No known exploits are available

Patch Publication Date: 3/15/2021

Vulnerability Publication Date: 3/12/2018

Reference Information

CVE: CVE-2018-7749

USN: 4854-1