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Amazon Linux 2 : mod_auth_mellon (ALAS-2019-1200)

high Nessus Plugin ID 125287

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Synopsis

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

Description

A vulnerability was found in a previous version of mod_auth_mellon. An open redirect in the logout URL allows requests with backslashes to pass through by assuming that it is a relative URL, while the browsers silently convert backslash characters into forward slashes treating them as an absolute URL. This mismatch allows an attacker to bypass the redirect URL validation logic in apr_uri_parse function.(CVE-2019-3877)

A vulnerability was found in mod_auth_mellon. If Apache is configured as a reverse proxy and mod_auth_mellon is configured to only let through authenticated users (with the require valid-user directive), adding special HTTP headers that are normally used to start the special SAML ECP (non-browser based) can be used to bypass authentication.(CVE-2019-3878)

Solution

Run 'yum update mod_auth_mellon' to update your system.

See Also

https://alas.aws.amazon.com/AL2/ALAS-2019-1200.html

Plugin Details

Severity: High

ID: 125287

File Name: al2_ALAS-2019-1200.nasl

Version: 1.2

Type: local

Agent: unix

Published: 5/21/2019

Updated: 1/15/2020

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

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

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

CVSS v3

Risk Factor: High

Base Score: 8.1

Temporal Score: 7.1

Vector: CVSS:3.0/AV:N/AC:H/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: p-cpe:/a:amazon:linux:mod_auth_mellon, p-cpe:/a:amazon:linux:mod_auth_mellon-debuginfo, p-cpe:/a:amazon:linux:mod_auth_mellon-diagnostics, 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: 5/20/2019

Vulnerability Publication Date: 3/26/2019

Reference Information

CVE: CVE-2019-3877, CVE-2019-3878

ALAS: 2019-1200