The pcs daemon (pcsd) in PCS 0.9.137 and earlier does not set the secure flag for a cookie in an https session, which makes it easier for remote attackers to capture this cookie by intercepting its transmission within an http session. NOTE: this issue was SPLIT per ADT2 due to different vulnerability types. CVE-2015-3983 is for the issue with not setting the HTTPOnly flag.

The remote host is affected by multiple vulnerabilities due to a failure by the PCS daemon (pcsd) to properly set flags in the 'Set-Cookie' header :

  - A security bypass vulnerability exists due to a failure     to set the 'secure' flag. A remote attacker can exploit     this to spoof cookies and bypass authorization checks.
    (CVE-2015-1848)

  - An information disclosure vulnerability exists due to a     failure to set the 'HttpOnly' flag. A remote attacker     can exploit this to obtain sensitive information from     a cookie. (CVE-2015-3983)

Fix for CVE-2015-1848, CVE-2015-3983 (sessions not signed)

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

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.

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. Note: the pcsd web UI is not enabled by default.
(CVE-2015-1848)

This update also fixes the following bug :

  - When the IPv6 protocol was disabled on a system,     starting the pcsd daemon on this system previously     failed. This update adds the ability for pcsd to fall     back to IPv4 when IPv6 is not available. As a result,     pcsd starts properly and uses IPv4 if IPv6 is disabled.

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

Updated pcs packages that fix one security issue and one bug are now available for Red Hat Enterprise Linux 6.

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 References section.

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. Note: the pcsd web UI is not enabled by default.
(CVE-2015-1848)

This issue was discovered by Tomas Jelinek of Red Hat.

This update also fixes the following bug :

* When the IPv6 protocol was disabled on a system, starting the pcsd daemon on this system previously failed. This update adds the ability for pcsd to fall back to IPv4 when IPv6 is not available. As a result, pcsd starts properly and uses IPv4 if IPv6 is disabled. (BZ#1212115)

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.

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 References section.

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. (CVE-2015-1848)

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 specified. (BZ#1205848)

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.

ID	Name	Product	Family	Severity
84289	PCS Daemon (pcsd) Cookie Signing Multiple Vulnerabilities	Nessus	CGI abuses	medium
84001	Fedora 21 : pcs-0.9.137-4.fc21 (2015-8788)	Nessus	Fedora Local Security Checks	medium
83999	Fedora 22 : pcs-0.9.139-4.fc22 (2015-8765)	Nessus	Fedora Local Security Checks	medium
83998	Fedora 20 : pcs-0.9.115-3.fc20 (2015-8761)	Nessus	Fedora Local Security Checks	medium
83454	Scientific Linux Security Update : pcs on SL7.x x86_64 (20150512)	Nessus	Scientific Linux Local Security Checks	medium
83453	Scientific Linux Security Update : pcs on SL6.x i386/srpm/x86_64 (20150512)	Nessus	Scientific Linux Local Security Checks	medium
83411	RHEL 6 : pcs (RHSA-2015:0990)	Nessus	Red Hat Local Security Checks	medium
83405	RHEL 7 : pcs (RHSA-2015:0980)	Nessus	Red Hat Local Security Checks	medium
83379	CentOS 6 : pcs (CESA-2015:0990)	Nessus	CentOS Local Security Checks	medium
83375	CentOS 7 : pcs (CESA-2015:0980)	Nessus	CentOS Local Security Checks	medium

Detections

Analytics

CVE-2015-1848

low

Tenable Plugins

medium

medium

medium

medium

medium

medium

medium

medium

medium

medium