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AUSCERT External Security Bulletin Redistribution
Important: pcs security and bug fix update
13 May 2015
AusCERT Security Bulletin Summary
Publisher: Red Hat
Operating System: Red Hat Enterprise Linux Server 7
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Provide Misleading Information -- Remote/Unauthenticated
Unauthorised Access -- Remote/Unauthenticated
CVE Names: CVE-2015-1848
Comment: This advisory references vulnerabilities in products which run on
platforms other than Red Hat. It is recommended that administrators
running pcs check for an updated version of the software for their
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Red Hat Security Advisory
Synopsis: Important: pcs security and bug fix update
Advisory ID: RHSA-2015:0980-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2015-0980.html
Issue date: 2015-05-12
CVE Names: CVE-2015-1848
Updated pcs packages that fix one security issue and one bug are now
available for Red Hat Enterprise Linux 7.
Red Hat Product Security has rated this update as having Important security
impact. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available from the CVE link in the
2. Relevant releases/architectures:
Red Hat Enterprise Linux Server High Availability (v. 7) - x86_64
Red Hat Enterprise Linux Server Resilient Storage (v. 7) - x86_64
The pcs packages provide a command-line tool and a web UI to configure and
manage the Pacemaker and Corosync tools.
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.
This issue was discovered by Tomas Jelinek of Red Hat.
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
All pcs users are advised to upgrade to these updated packages, which
contain backported patches to correct these issues. After installing the
updated packages, the pcsd daemon will be restarted automatically.
Before applying this update, make sure all previously released errata
relevant to your system have been applied.
For details on how to apply this update, refer to:
5. Bugs fixed (https://bugzilla.redhat.com/):
1208294 - CVE-2015-1848 pcs: improper web session variable signing
6. Package List:
Red Hat Enterprise Linux Server High Availability (v. 7):
Red Hat Enterprise Linux Server Resilient Storage (v. 7):
These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
The Red Hat security contact is <email@example.com>. More contact
details at https://access.redhat.com/security/team/contact/
Copyright 2015 Red Hat, Inc.
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