Scientific Linux Security Update : pcs on SL7.x x86_64

Medium Nessus Plugin ID 83454


The remote Scientific Linux host is missing one or more security updates.


It was found that the pcs daemon did not sign cookies containing session data that were sent to clients connecting via the pcsd web UI.
A remote attacker could use this flaw to forge cookies and bypass authorization checks, possibly gaining elevated privileges in the pcsd web UI. (CVE-2015-1848)

This update also fixes the following bug :

- Previously, the Corosync tool allowed the two_node option and the auto_tie_breaker option to exist in the corosync.conf file at the same time. As a consequence, if both options were included, auto_tie_breaker was silently ignored and the two_node fence race decided which node would survive in the event of a communication break. With this update, the pcs daemon has been fixed so that it does not produce corosync.conf files with both two_node and auto_tie_breaker included. In addition, if both two_node and auto_tie_breaker are detected in corosync.conf, Corosync issues a message at start-up and disables two_node mode. As a result, auto_tie_breaker effectively overrides two_node mode if both options are specified.

After installing the updated packages, the pcsd daemon will be restarted automatically.


Update the affected pcs, pcs-debuginfo and / or python-clufter packages.

See Also

Plugin Details

Severity: Medium

ID: 83454

File Name: sl_20150512_pcs_on_SL7_x.nasl

Version: $Revision: 2.2 $

Type: local

Agent: unix

Published: 2015/05/14

Modified: 2015/05/18

Dependencies: 12634

Risk Information

Risk Factor: Medium


Base Score: 6.8

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

Vulnerability Information

CPE: x-cpe:/o:fermilab:scientific_linux

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

Patch Publication Date: 2015/05/12

Reference Information

CVE: CVE-2015-1848