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AUSCERT External Security Bulletin Redistribution
ESB-2014.0309
Security Bulletin: Potential Denial of service vulnerability in
Communications Server for Data Center Deployment and
Communications Server for Windows (CVE-2013-6747)
10 March 2014
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: IBM Communications Server for Data Center Deployment
Publisher: IBM
Operating System: AIX
Linux variants
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2013-6747 CVE-2013-6745
Reference: ESB-2014.0201
ESB-2014.0113
ESB-2013.1842
Original Bulletin:
http://www-01.ibm.com/support/docview.wss?uid=swg21666271
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Security Bulletin: Potential Denial of service vulnerability in Communications
Server for Data Center Deployment and Communications Server for Windows
(CVE-2013-6747)
Security Bulletin
Document information
More support for:
Communications Server for Data Center Deployment
Software version:
7.0.0.0
Operating system(s):
AIX, Linux, Linux on System z
Reference #:
1666271
Modified date:
2014-03-07
Summary
A potential denial of service vulnerability in SSL handshake processing in
Communications Server for Data Center Deployment (CSDCD) and Communications
Server for Windows (CS Windows).
Vulnerability Details
CVE ID: CVE-2013-6747
Description: Potential denial of service in SSL handshake processing.
CVSS Base Score: 7.1
CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/89863 for the
current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:M/Au:N/C:N/I:N/A:C)
Affected Products
VERSIONS AFFECTED: This problem affects the following distributed
Communications Server products:
Product ID Product name
- ------------- --------------------
5725H32 Communications Server for Data Center Deployment 7.0
5639F25 Communications Server for Windows V6.4 , V6.1.3
5765E51 Communications Server for AIX V6.4 , V6.3
5724I33 Communications Server for Linux V6.4 , V6.2.3
5724I34 Communications Server for Linux on System z V6.4 , V6.2.3
Remediation/Fixes
The recommended solution is to apply the Fix Pack or PTF for each named
product as soon as practical. Visit Fix Central to find these APARs (under
Other Software brand).
Product ID Product name
- ------------- --------------------
5725H32 Communications Server for Data Center Deployment 7.0
- - apply APAR IV56034 for AIX plaform
5725H32 Communications Server for Data Center Deployment 7.0
- - apply APAR LI77828 for Linux platforms
5639F25 Communications Server for Windows V6.4
- - apply APAR JR49491
5765E51 Communications Server for AIX V6.4
- - apply APAR IV56008
or apply release refresh V6.4.0.5
5724I33 Communications Server for Linux V6.4
- - apply APAR LI77832 for x86/x86_64
or apply release refresh V6.4.0.5
5724I33 Communications Server for Linux V6.4
- - apply APAR LI77835 for ppc
or apply release refresh V6.4.0.5
5724I34 Communications Server for Linux on System z V6.4
- - apply APAR LI77853 for s390x
or apply release refresh V6.4.0.5
5639F25 Communications Server for Windows V6.1.3
- - apply APAR JR49499
On Fix Central: The following releases will have e-fix packages
5765E51 Communications Server for AIX V6.3.1
- - apply e-fix csaixv6_gskit7_48_update.tar
5724I33 Communications Server for Linux V6.2.3
- - apply e-fix 5724i33_gsakit7_48_update.tgz
5724I34 Communications Server for Linux on System z V6.2.3
- - apply e-fix 5724i34_gsakit7_48_update.tgz
Workarounds/Mitigations
Disabling the SSLv3 Session cache will circumvent this issue, but may lead to
higher CPU usage. To use the circumvention:
For Windows platforms, do one of the following:
Any Release:
Set the system wide environment variable 'GSK_V3_SIDCACHE_SIZE=0"
Restart the system
For Linux platforms, do one of the following:
Release: CSDCD V7.0, or later
CS Linux V.6.4.0.3 or later
CS Linux on System z V6.4.0.3 or later
Export the native environment variable 'GSK_V3_SIDCACHE_SIZE=0' in
'/etc/opt/ibm/sna/environments'
Perform a full stop and start of the server.
For AIX platforms, do one of the following:
Release:
CSDCD V7.0, or later
CS/AIX V.6.4.0.3 or later
Export the native environment variable 'GSK_V3_SIDCACHE_SIZE=0' in
'/etc/sna/environments'
Perform a full stop and start of the server.
Important note:
IBM strongly suggests that all System z customers be subscribed to the System
z Security Portal to receive the latest critical System z security and
integrity service. If you are not subscribed, see the instructions on the
System z Security web site. Security and integrity APARs and associated fixes
will be posted to this portal. IBM suggests reviewing the CVSS scores and
applying all security or integrity fixes as soon as possible to minimize any
potential risk.
References:
Complete CVSS Guide
On-line Calculator V2
Related information
IBM Secure Engineering Website
IBM Problem Security Incident Report Tracking
Latest Fixpack for Communications Server for Linux
Latest Fixpack for Communications Server for AIX
Latest Fixpack for Communications Server for Linux on S
Change History
March 3 - Initial creation
*The CVSS Environment Score is customer environment specific and will
ultimately impact the Overall CVSS Score. Customers can evaluate the impact of
this vulnerability in their environments by accessing the links in the
Reference section of this Security Bulletin.
Note: According to the Forum of Incident Response and Security Teams (FIRST),
the Common Vulnerability Scoring System (CVSS) is an "industry open standard
designed to convey vulnerability severity and help to determine urgency and
priority of response." IBM PROVIDES THE CVSS SCORES "AS IS" WITHOUT WARRANTY
OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT
OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.
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