Amazon Linux 2 : pcs (ALAS-2018-1005)

high Nessus Plugin ID 109365

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Synopsis

The remote Amazon Linux 2 host is missing a security update.

Description

Debug parameter removal bypass, allowing information disclosure

It was found that the REST interface of the pcsd service did not properly remove the pcs debug argument from the /run_pcs query, possibly disclosing sensitive information. A remote attacker with a valid token could use this flaw to elevate their privilege.
(CVE-2018-1086)

Timing attack in authenticity_token.rb

Sinatra rack-protection versions 1.5.4 and 2.0.0.rc3 and earlier contains a timing attack vulnerability in the CSRF token checking that can result in signatures can be exposed. This attack appear to be exploitable via network connectivity to the ruby application. This vulnerability appears to have been fixed in 1.5.5 and 2.0.0.
(CVE-2018-1000119)

Privilege escalation via authorized user malicious REST call

It was found that the REST interface of the pcsd service did not properly sanitize the file name from the /remote/put_file query. If the /etc/booth directory exists, an authenticated attacker with write permissions could create or overwrite arbitrary files with arbitrary data outside of the /etc/booth directory, in the context of the pcsd process. (CVE-2018-1079)

Solution

Run 'yum update pcs' to update your system.

Plugin Details

Severity: High

ID: 109365

File Name: al2_ALAS-2018-1005.nasl

Version: 1.4

Type: local

Agent: unix

Family: Amazon Linux Local Security Checks

Published: 4/27/2018

Updated: 3/21/2019

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

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

CVSS v3

Risk Factor: High

Base Score: 7.5

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

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:pcs, p-cpe:/a:amazon:linux:pcs-debuginfo, p-cpe:/a:amazon:linux:pcs-snmp, cpe:/o:amazon:linux:2

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

Patch Publication Date: 4/26/2018

Vulnerability Publication Date: 3/7/2018

Reference Information

CVE: CVE-2018-1000119, CVE-2018-1079, CVE-2018-1086

ALAS: 2018-1005

Detections

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