Amazon Linux AMI : ruby24 / ruby22,ruby23 (ALAS-2018-978)

critical Nessus Plugin ID 108603

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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

Unsafe object deserialization through YAML formatted gem specifications :

A vulnerability was found where the rubygems module was vulnerable to an unsafe YAML deserialization when inspecting a gem. Applications inspecting gem files without installing them can be tricked to execute arbitrary code in the context of the ruby interpreter. (CVE-2017-0903)

Solution

Run 'yum update ruby24' to update your system.

Run 'yum update ruby22' to update your system.

Run 'yum update ruby23' to update your system.

See Also

https://alas.aws.amazon.com/ALAS-2018-978.html

Plugin Details

Severity: Critical

ID: 108603

File Name: ala_ALAS-2018-978.nasl

Version: 1.2

Type: local

Agent: unix

Published: 3/27/2018

Updated: 4/18/2018

Dependencies: ssh_get_info.nasl

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: High

Base Score: 7.5

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

CVSS v3

Risk Factor: Critical

Base Score: 9.8

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

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:ruby22, p-cpe:/a:amazon:linux:ruby22-debuginfo, p-cpe:/a:amazon:linux:ruby22-devel, p-cpe:/a:amazon:linux:ruby22-doc, p-cpe:/a:amazon:linux:ruby22-irb, p-cpe:/a:amazon:linux:ruby22-libs, p-cpe:/a:amazon:linux:ruby23, p-cpe:/a:amazon:linux:ruby23-debuginfo, p-cpe:/a:amazon:linux:ruby23-devel, p-cpe:/a:amazon:linux:ruby23-doc, p-cpe:/a:amazon:linux:ruby23-irb, p-cpe:/a:amazon:linux:ruby23-libs, p-cpe:/a:amazon:linux:ruby24, p-cpe:/a:amazon:linux:ruby24-debuginfo, p-cpe:/a:amazon:linux:ruby24-devel, p-cpe:/a:amazon:linux:ruby24-doc, p-cpe:/a:amazon:linux:ruby24-irb, p-cpe:/a:amazon:linux:ruby24-libs, p-cpe:/a:amazon:linux:rubygem22-bigdecimal, p-cpe:/a:amazon:linux:rubygem22-io-console, p-cpe:/a:amazon:linux:rubygem22-psych, p-cpe:/a:amazon:linux:rubygem23-bigdecimal, p-cpe:/a:amazon:linux:rubygem23-did_you_mean, p-cpe:/a:amazon:linux:rubygem23-io-console, p-cpe:/a:amazon:linux:rubygem23-json, p-cpe:/a:amazon:linux:rubygem23-psych, p-cpe:/a:amazon:linux:rubygem24-bigdecimal, p-cpe:/a:amazon:linux:rubygem24-did_you_mean, p-cpe:/a:amazon:linux:rubygem24-io-console, p-cpe:/a:amazon:linux:rubygem24-json, p-cpe:/a:amazon:linux:rubygem24-psych, p-cpe:/a:amazon:linux:rubygem24-xmlrpc, p-cpe:/a:amazon:linux:rubygems22, p-cpe:/a:amazon:linux:rubygems22-devel, p-cpe:/a:amazon:linux:rubygems23, p-cpe:/a:amazon:linux:rubygems23-devel, p-cpe:/a:amazon:linux:rubygems24, p-cpe:/a:amazon:linux:rubygems24-devel, cpe:/o:amazon:linux

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

Patch Publication Date: 3/21/2018

Reference Information

CVE: CVE-2017-0903

ALAS: 2018-978