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AUSCERT External Security Bulletin Redistribution
ESB-2015.0178
Security Bulletin: TLS padding vulnerability affects IBM
Data Server Client packages (CVE-2014-8730)
27 January 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: IBM Data Server Client
IBM Data Server Runtime Client
IBM Data Server Driver Package
IBM Data Server Driver for ODBC and CLI
Publisher: IBM
Operating System: AIX
HP-UX
Linux variants
Solaris
Windows
Impact/Access: Access Privileged Data -- Remote with User Interaction
Reduced Security -- Remote with User Interaction
Resolution: Mitigation
CVE Names: CVE-2014-8730
Reference: ESB-2015.0134
ESB-2015.0122
ESB-2015.0066
ESB-2015.0065
ESB-2015.0064
ESB-2015.0063.2
Original Bulletin:
http://www-01.ibm.com/support/docview.wss?uid=swg21693877
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Security Bulletin: TLS padding vulnerability affects IBM Data Server Client
packages (CVE-2014-8730)
Document information
More support for:
IBM Data Server Client Packages
Software version:
9.5, 9.7, 10.1, 10.5
Operating system(s):
AIX, HP-UX, Linux, Solaris, Windows
Reference #:
1693877
Modified date:
2015-01-23
Security Bulletin
Summary
Transport Layer Security (TLS) padding vulnerability via a POODLE (Padding
Oracle On Downgraded Legacy Encryption) like attack affects IBM Data Server
Client packages.
Vulnerability Details
CVE-ID: CVE-2014-8730
DESCRIPTION: Product could allow a remote attacker to obtain sensitive
information, caused by the failure to check the contents of the padding bytes
when using CBC cipher suites of some TLS implementations. A remote user with
the ability to conduct a man-in-the-middle attack could exploit this
vulnerability via a POODLE (Padding Oracle On Downgraded Legacy Encryption)
like attack to decrypt sensitive information and calculate the plaintext of
secure connections.
All users that have the Secure Sockets Layer (SSL) support enabled in the IBM
data server clients are affected. The SSL support is not enabled in the IBM
data server client by default.
CVSS Base Score: 4.3
CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/99216 for the
current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:M/Au:N/C:P/I:N/A:N)
Affected Products and Versions
All versions and fix pack levels of IBM data server client products that are
running on the AIX, Linux, HP, Solaris, or Windows operating systems are
affected.
IBM Data Server Client: V9.5, V9.7, V10.1, V10.5
IBM Data Server Runtime Client: V9.5, V9.7, V10.1, V10.5
IBM Data Server Driver Package: V9.5, V9.7, V10.1, V10.5
IBM Data Server Driver for ODBC and CLI: V9.5, V9.7, V10.1, V10.5
Remediation/Fixes
None.
Workarounds and Mitigations
As remediation, you need to set the GSK_STRICTCHECK_CBCPADBYTES environment
variable and restart the application.
The GSK_STRICTCHECK_CBCPADBYTES environment variable is available in the
following GSKit versions:
GSKit 8.0.14.27 and later
GSKit 7.0.4.45 and later
IBM data server client products for V10.5 FP5 are packaged with GSKit
v8.0.50.31.
If you installed a separate GSKit in your environment or if you do not have
the IBM data server client V10.5 FP5 or later product, you must ensure that
the GSKit in your environment supports the GSK_STRICTCHECK_CBCPADBYTES
environment variable. If your current GSKit installation does not support the
GSK_STRICTCHECK_CBCPADBYTES environment variable, you must install a GSKit
version that supports the required GSK_STRICTCHECK_CBCPADBYTES environment
variable. You can obtain the GSKit from the IBM PassPort Advantage (PPA) site.
You can obtain the GSKit version with the GSKit version check command. For
GSKit Version 8, you can issue the gsk8ver command for a 32-bit GSKit
installation and the gsk8ver_64 command for a 64-bit GSKit installation. For
more information, see the GSKit documentation.
On the Linux and UNIX operating system:
export GSK_STRICTCHECK_CBCPADBYTES=GSK_TRUE
On the Windows operating system:
Set the GSK_STRICTCHECK_CBCPADBYTES environment variable at the system level.
The environment should be tested after you implement the
GSK_STRICTCHECK_CBCPADBYTES environment variable to ensure that there are no
compatibility issues.
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References
Complete CVSS Guide
On-line Calculator V2
Related information
IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog
Change History
16 Jan 2015: Original Version Published
*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.
Disclaimer
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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