pcs before version 0.9.164 and 0.10 is vulnerable to a privilege escalation via authorized user malicious REST call. 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.

The remote NewStart CGSL host, running version CORE 5.04 / MAIN 5.04, has pcs packages installed that are affected by multiple vulnerabilities:

  - 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)

  - 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)

  - 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)

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

Security fix for CVE-2018-1086 and CVE-2018-1079

Rebased to latest upstream sources

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

An update for pcs is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

The pcs packages provide a command-line configuration system for the Pacemaker and Corosync utilities.

Security Fix(es) :

* pcs: Privilege escalation via authorized user malicious REST call (CVE-2018-1079)

* pcs: Debug parameter removal bypass, allowing information disclosure (CVE-2018-1086)

* rack-protection: Timing attack in authenticity_token.rb (CVE-2018-1000119)

For more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section.

The CVE-2018-1079 issue was discovered by Ondrej Mular (Red Hat) and the CVE-2018-1086 issue was discovered by Cedric Buissart (Red Hat).

Security Fix(es) :

  - pcs: Privilege escalation via authorized user malicious     REST call (CVE-2018-1079)

  - pcs: Debug parameter removal bypass, allowing     information disclosure (CVE-2018-1086)

  - rack-protection: Timing attack in authenticity_token.rb     (CVE-2018-1000119)

The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2018-1060 advisory.

    - Fixed CVE-2018-1086 pcs: Debug parameter removal bypass, allowing information disclosure
    - Fixed CVE-2018-1079 pcs: Privilege escalation via authorized user malicious REST call
    - Fixed CVE-2018-1000119 rack-protection: Timing attack in authenticity_token.rb

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

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

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)

Security fix for CVE-2018-1086 and CVE-2018-1079

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2018:1060 advisory.

  - pcs: Privilege escalation via authorized user malicious REST call (CVE-2018-1079)

  - pcs: Debug parameter removal bypass, allowing information disclosure (CVE-2018-1086)

  - rack-protection: Timing attack in authenticity_token.rb (CVE-2018-1000119)

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

ID	Name	Product	Family	Severity
127219	NewStart CGSL CORE 5.04 / MAIN 5.04 : pcs Multiple Vulnerabilities (NS-SA-2019-0042)	Nessus	NewStart CGSL Local Security Checks	high
120745	Fedora 28 : pcs (2018-bbfb0f5bc9)	Nessus	Fedora Local Security Checks	high
110237	CentOS 7 : pcs (CESA-2018:1060)	Nessus	CentOS Local Security Checks	high
109456	Scientific Linux Security Update : pcs on SL7.x x86_64 (20180410)	Nessus	Scientific Linux Local Security Checks	high
109438	Oracle Linux 7 : pcs (ELSA-2018-1060)	Nessus	Oracle Linux Local Security Checks	high
109365	Amazon Linux 2 : pcs (ALAS-2018-1005)	Nessus	Amazon Linux Local Security Checks	high
109152	Fedora 26 : pcs (2018-ce5d7106d8)	Nessus	Fedora Local Security Checks	high
109150	Fedora 27 : pcs (2018-57bbe74c6c)	Nessus	Fedora Local Security Checks	high
108996	RHEL 7 : pcs (RHSA-2018:1060)	Nessus	Red Hat Local Security Checks	high

Detections

Analytics

CVE-2018-1079

medium

Tenable Plugins

high

high

high

high

high

high

high

high

high