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

critical Nessus Plugin ID 108603

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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

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

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: High

Base Score: 7.5

Vector: CVSS2#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:rubygems23-devel, p-cpe:/a:amazon:linux:ruby23-debuginfo, p-cpe:/a:amazon:linux:ruby23-doc, p-cpe:/a:amazon:linux:ruby24, p-cpe:/a:amazon:linux:rubygems23, p-cpe:/a:amazon:linux:ruby23-irb, p-cpe:/a:amazon:linux:ruby23-devel, p-cpe:/a:amazon:linux:rubygem22-psych, p-cpe:/a:amazon:linux:ruby22-devel, p-cpe:/a:amazon:linux:rubygem23-io-console, p-cpe:/a:amazon:linux:rubygem23-json, p-cpe:/a:amazon:linux:rubygem24-did_you_mean, cpe:/o:amazon:linux, p-cpe:/a:amazon:linux:rubygems22, p-cpe:/a:amazon:linux:rubygem22-bigdecimal, p-cpe:/a:amazon:linux:ruby23-libs, p-cpe:/a:amazon:linux:ruby23, p-cpe:/a:amazon:linux:rubygem23-bigdecimal, p-cpe:/a:amazon:linux:rubygem24-json, p-cpe:/a:amazon:linux:rubygems22-devel, p-cpe:/a:amazon:linux:rubygem24-io-console, p-cpe:/a:amazon:linux:rubygem23-psych, p-cpe:/a:amazon:linux:ruby24-doc, p-cpe:/a:amazon:linux:ruby22-doc, p-cpe:/a:amazon:linux:rubygem24-xmlrpc, p-cpe:/a:amazon:linux:ruby22, p-cpe:/a:amazon:linux:ruby24-libs, p-cpe:/a:amazon:linux:ruby22-libs, p-cpe:/a:amazon:linux:ruby22-irb, p-cpe:/a:amazon:linux:rubygems24, p-cpe:/a:amazon:linux:ruby24-irb, p-cpe:/a:amazon:linux:rubygems24-devel, p-cpe:/a:amazon:linux:ruby22-debuginfo, p-cpe:/a:amazon:linux:rubygem24-bigdecimal, p-cpe:/a:amazon:linux:ruby24-devel, p-cpe:/a:amazon:linux:rubygem23-did_you_mean, p-cpe:/a:amazon:linux:rubygem24-psych, p-cpe:/a:amazon:linux:rubygem22-io-console, p-cpe:/a:amazon:linux:ruby24-debuginfo

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