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Amazon Linux AMI : mod24_auth_mellon (ALAS-2019-1200)

high Nessus Plugin ID 124653

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Synopsis

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

Description

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)

A vulnerability was found in mod_auth_mellon where 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)

Solution

Run 'yum update mod24_auth_mellon' to update your system.

See Also

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

Plugin Details

Severity: High

ID: 124653

File Name: ala_ALAS-2019-1200.nasl

Version: 1.3

Type: local

Agent: unix

Published: 5/7/2019

Updated: 5/28/2024

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

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5.3

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

CVSS Score Source: CVE-2019-3878

CVSS v3

Risk Factor: High

Base Score: 8.1

Temporal Score: 7.3

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:P/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:mod24_auth_mellon-debuginfo, p-cpe:/a:amazon:linux:mod24_auth_mellon, cpe:/o:amazon:linux, p-cpe:/a:amazon:linux:mod24_auth_mellon-diagnostics

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 5/6/2019

Vulnerability Publication Date: 3/26/2019

Reference Information

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

ALAS: 2019-1200