Amazon Linux AMI : openssl (ALAS-2015-564)

medium Nessus Plugin ID 84647
New! Plugin Severity Now Using CVSS v3

The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

Synopsis

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

Description

During certificate verfification, OpenSSL (starting from version 1.0.1n and 1.0.2b) will attempt to find an alternative certificate chain if the first attempt to build such a chain fails. An error in the implementation of this logic can mean that an attacker could cause certain checks on untrusted certificates to be bypassed, such as the CA flag, enabling them to use a valid leaf certificate to act as a CA and 'issue' an invalid certificate.

This issue will impact any application that verifies certificates including SSL/TLS/DTLS clients and SSL/TLS/DTLS servers using client authentication.

The only version of OpenSSL from the Amazon Linux AMI that is impacted by this CVE is openssl-1.0.1k-10.86.amzn1, which was published as ALAS-2015-550.

Solution

Run 'yum update openssl' to update your system. Note that you may need to run 'yum clean all' first.

See Also

https://alas.aws.amazon.com/ALAS-2015-550.html

https://alas.aws.amazon.com/ALAS-2015-564.html

Plugin Details

Severity: Medium

ID: 84647

File Name: ala_ALAS-2015-564.nasl

Version: 1.7

Type: local

Agent: unix

Published: 7/13/2015

Updated: 4/18/2018

Dependencies: ssh_get_info.nasl

Risk Information

VPR

Risk Factor: Low

Score: 3.3

CVSS v2

Risk Factor: Medium

Base Score: 6.4

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

CVSS v3

Risk Factor: Medium

Base Score: 6.5

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

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:openssl, p-cpe:/a:amazon:linux:openssl-debuginfo, p-cpe:/a:amazon:linux:openssl-devel, p-cpe:/a:amazon:linux:openssl-perl, p-cpe:/a:amazon:linux:openssl-static, cpe:/o:amazon:linux

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

Patch Publication Date: 7/9/2015

Reference Information

CVE: CVE-2015-1793

ALAS: 2015-564