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AUSCERT External Security Bulletin Redistribution
Security Bulletin: TLS padding vulnerability affects IBM DB2
18 December 2014
AusCERT Security Bulletin Summary
Product: IBM DB2
Operating System: AIX
Impact/Access: Access Privileged Data -- Remote with User Interaction
Reduced Security -- Remote with User Interaction
CVE Names: CVE-2014-8730
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Security Bulletin: TLS padding vulnerability affects IBM DB2 LUW
More support for:
DB2 for Linux, UNIX and Windows
9.5, 9.7, 9.8, 10.1, 10.5
AIX, HP-UX, Linux, Solaris, Windows
Advanced Enterprise Server, Advanced Workgroup Server, Enterprise Server,
Express, Express-C, Personal, Workgroup Server
Transport Layer Security (TLS) padding vulnerability via a POODLE (Padding
Oracle On Downgraded Legacy Encryption) like attack affects IBM DB2 LUW.
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.
CVSS Base Score: 4.3
CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/99216 for the
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:M/Au:N/C:P/I:N/A:N)
Affected Products and Versions
Customers have Secure Sockets Layer (SSL) support enabled in their DB2
database system are affected. SSL support is not enabled in DB2 by default.
All fix pack levels for IBM DB2 V9.5, V9.7, V10.1 and V10.5 editions listed
below and running on AIX, Linux, HP, Solaris or Windows are affected :
IBM DB2 Express Edition
IBM DB2 Workgroup Server Edition
IBM DB2 Enterprise Server Edition
IBM DB2 Advanced Enterprise Server Edition
IBM DB2 Advanced Workgroup Server Edition
IBM DB2 Connect Application Server Edition
IBM DB2 Connect Enterprise Edition
IBM DB2 Connect Unlimited Edition for System i
IBM DB2 Connect Unlimited Edition for System z
The DB2 Connect products mentioned are affected only if a local database has
IBM DB2 pureScale Feature for Enterprise Server Edition, V9.8, running on AIX
or Linux is affected.
Workarounds and Mitigations
This problem can be mitigated by setting the operating system environment
Customers in the fix pack level of V9.7 FP9, V10.1 FP3a, V10.5 GA or higher
should follow the instruction below to mitigate the problem.
Customer with V9.5 should contact DB2 support to obtain V9.5 FP10a and follow
the instruction below to mitigate the problem.
Customer in fix pack level of V9.7 FP8 or lower, all fix pack level of V9.8 or
V10.1 FP3 or lower should upgrade to the latest fix pack. Then follow the
instruction below to mitigate the problem.
Customer should set the environment variable GSK_STRICTCHECK_CBCPADBYTES on
each DB2 server instance as follow:
1) As the DB2 instance owner, add the following line to the userprofile file
that is located under the sqllib directory:
2) As a user with DB2 SYSADM privilege, run the following commands:
The commands above assume that DB2ENVLIST registry variable is not set. If it
is set, the environment variable names need to be delimited with a space. For
example, if DB2ENVLIST is already set to SOME_ENV, it needs to be set as
db2set DB2ENVLIST="SOME_ENV GSK_STRICTCHECK_CBCPADBYTES"
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IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog
December 16, 2014: 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.
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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