Amazon Linux 2 : mod_auth_openidc (ALAS-2020-1538)

medium Nessus Plugin ID 141990

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Synopsis

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

Description

The version of mod_auth_openidc installed on the remote host is prior to 1.8.8-7. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2020-1538 advisory.

An open redirect flaw was discovered in mod_auth_openidc, where it handles logout redirection. The module does not correctly validate the URL, allowing a URL with leading slashes to bypass the protection checks.
A victim user may be tricked into visiting a trusted vulnerable web site, which would redirect them to another possibly malicious URL. (CVE-2019-14857)

An open redirect flaw was discovered in mod_auth_openidc where it handles logout redirection. The module does not correctly validate the URL, allowing a URL with slash and backslash at the beginning to bypass the protection checks. A victim user may be tricked into visiting a trusted vulnerable web site, which would redirect him to another, possibly malicious, URL. (CVE-2019-20479)

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

Run 'yum update mod_auth_openidc' to update your system.

Plugin Details

Severity: Medium

ID: 141990

File Name: al2_ALAS-2020-1538.nasl

Version: 1.3

Type: local

Agent: unix

Family: Amazon Linux Local Security Checks

Published: 10/28/2020

Updated: 12/11/2024

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

Risk Information

VPR

Risk Factor: Low

Score: 3.0

CVSS v2

Risk Factor: Medium

Base Score: 5.8

Temporal Score: 4.3

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

CVSS Score Source: CVE-2019-20479

CVSS v3

Risk Factor: Medium

Base Score: 6.1

Temporal Score: 5.3

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

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

Vulnerability Information

CPE: cpe:/o:amazon:linux:2, p-cpe:/a:amazon:linux:mod_auth_openidc, p-cpe:/a:amazon:linux:mod_auth_openidc-debuginfo

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

Exploit Ease: No known exploits are available

Patch Publication Date: 10/22/2020

Vulnerability Publication Date: 11/26/2019

Reference Information

CVE: CVE-2019-14857, CVE-2019-20479

ALAS: 2020-1538

Detections

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