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Amazon Linux 2 : python-urllib3 (ALAS-2021-1688)

high Nessus Plugin ID 151792

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Synopsis

The remote Amazon Linux 2 host is missing a security update.

Description

The version of python-urllib3 installed on the remote host is prior to 1.25.9-1. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2021-1688 advisory.

 A flaw was found in python-urllib3. When provided with a URL containing many @ characters in the authority component, the authority's regular expression exhibits catastrophic backtracking. This flaw causes a denial of service if a URL is passed as a parameter or redirected via an HTTP redirect. The highest threat from this vulnerability is to system availability. (CVE-2021-33503)

Tenable has extracted the preceding description block directly from the tested product 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

Run 'yum update python-urllib3' to update your system.

See Also

https://alas.aws.amazon.com/AL2/ALAS-2021-1688.html

https://access.redhat.com/security/cve/CVE-2021-33503

Plugin Details

Severity: High

ID: 151792

File Name: al2_ALAS-2021-1688.nasl

Version: 1.3

Type: local

Agent: unix

Published: 7/16/2021

Updated: 12/11/2024

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

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

CVSS Score Source: CVE-2021-33503

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

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

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:python-urllib3, cpe:/o:amazon:linux:2

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

Exploit Ease: No known exploits are available

Patch Publication Date: 7/14/2021

Vulnerability Publication Date: 6/29/2021

Reference Information

CVE: CVE-2021-33503

ALAS: 2021-1688