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Amazon Linux AMI : ruby20 (ALAS-2021-1468)

high Nessus Plugin ID 145009

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Synopsis

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

Description

The version of ruby20 installed on the remote host is prior to 2.0.0.648-2.39. It is, therefore, affected by a vulnerability as referenced in the ALAS-2021-1468 advisory.

 - An issue was discovered in Ruby through 2.5.8, 2.6.x through 2.6.6, and 2.7.x through 2.7.1. WEBrick, a simple HTTP server bundled with Ruby, had not checked the transfer-encoding header value rigorously. An attacker may potentially exploit this issue to bypass a reverse proxy (which also has a poor header check), which may lead to an HTTP Request Smuggling attack. (CVE-2020-25613)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Run 'yum update ruby20' to update your system.

See Also

https://alas.aws.amazon.com/ALAS-2021-1468.html

https://access.redhat.com/security/cve/CVE-2020-25613

Plugin Details

Severity: High

ID: 145009

File Name: ala_ALAS-2021-1468.nasl

Version: 1.2

Type: local

Agent: unix

Published: 1/14/2021

Updated: 1/14/2021

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

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

CVSS Score Source: CVE-2020-25613

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:rubygems20, p-cpe:/a:amazon:linux:rubygems20-devel, cpe:/o:amazon:linux, p-cpe:/a:amazon:linux:ruby20, p-cpe:/a:amazon:linux:ruby20-debuginfo, p-cpe:/a:amazon:linux:ruby20-devel, p-cpe:/a:amazon:linux:ruby20-doc, p-cpe:/a:amazon:linux:ruby20-irb, p-cpe:/a:amazon:linux:ruby20-libs, p-cpe:/a:amazon:linux:rubygem20-bigdecimal, p-cpe:/a:amazon:linux:rubygem20-io-console, p-cpe:/a:amazon:linux:rubygem20-psych

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

Exploit Ease: No known exploits are available

Patch Publication Date: 1/12/2021

Vulnerability Publication Date: 10/6/2020

Reference Information

CVE: CVE-2020-25613

ALAS: 2021-1468