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Ubuntu 20.04 ESM : Olm vulnerability (USN-5194-1)

critical Nessus Plugin ID 183525

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Synopsis

The remote Ubuntu host is missing a security update.

Description

The remote Ubuntu 20.04 ESM host has packages installed that are affected by a vulnerability as referenced in the USN-5194-1 advisory.

 - Matrix libolm before 3.2.3 allows a malicious Matrix homeserver to crash a client (while it is attempting to retrieve an Olm encrypted room key backup from the homeserver) because olm_pk_decrypt has a stack-based buffer overflow. Remote code execution might be possible for some nonstandard build configurations.
 (CVE-2021-34813)

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 libolm-dev, libolm3 and / or python3-olm packages.

See Also

https://ubuntu.com/security/notices/USN-5194-1

Plugin Details

Severity: Critical

ID: 183525

File Name: ubuntu_USN-5194-1.nasl

Version: 1.0

Type: local

Agent: unix

Published: 10/20/2023

Updated: 10/20/2023

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: 5.9

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

CVSS Score Source: CVE-2021-34813

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: cpe:/o:canonical:ubuntu_linux:20.04:-:esm, p-cpe:/a:canonical:ubuntu_linux:libolm-dev, p-cpe:/a:canonical:ubuntu_linux:libolm3, p-cpe:/a:canonical:ubuntu_linux:python3-olm

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: 12/15/2021

Vulnerability Publication Date: 6/16/2021

Reference Information

CVE: CVE-2021-34813

USN: 5194-1