IBM Support

Security Bulletin: IBM® DB2® is impacted by multiple TLS/SSL security vulnerabilities (CVE-2013-6747, CVE-2014-0963)

Security Bulletin


IBM DB2 for Linux, Unix and Windows is affected by multiple problems related to the SSL implementation, which, under very specific conditions, can cause DB2 server to become unresponsive, hang or crash.

By default, DB2 does not use TLS/SSL for client-server communication and therefore, potential exposure only exists if you are using TLS/SSL.

Vulnerability Details

CVE ID: CVE-2013-6747

IBM DB2 is affected by a problem with the handling of certain SSL messages. A TLS/SSL connection using a malformed certificate chain could cause the server process to hang or crash.

CVSS Base Score: 7.1
CVSS Temporal Score: See for the current score
CVSS Environmental Score*: Undefined
CVSS String: (AV/N:AC/M:Au/N:C/N:I/N:A/C)

CVE ID: CVE-2014-0963

IBM DB2 is affected by a problem with the handling of certain SSL messages. The TLS implementation can, under very specific conditions, cause CPU utilization to rapidly increase. The situation occurs only in a certain error case that causes a single thread to begin looping. If this happens multiple times, more threads will begin to loop and an increase in CPU utilization will be seen. This increase could ultimately result in CPU exhaustion and unresponsiveness of the DB2 server and other software running on the affected system.

This issue can affect the availability of the system, but does not impact system confidentiality or integrity. This vulnerability can be remotely exploited, authentication is not required and the exploit is moderately complex.

To determine if your systems are being affected by this issue, you can monitor the CPU utilization of the DB2 server instances.

CVSS Base Score: 7.1
CVSS Temporal Score: See for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:M/Au:N/C:N/I:N/A:C)

Affected Products and Versions

The following IBM DB2 and DB2 Connect V9.1, V9.5, V9.7, V10.1 and V10.5 editions running on AIX, Linux, HP, Solaris and Windows are vulnerable.

IBM DB2 Express Edition
IBM DB2 Workgroup Server Edition
IBM DB2 Enterprise Server Edition
IBM DB2 Connect™ Application Server Edition
IBM DB2 Connect Application Server Advanced Edition
IBM DB2 Connect Enterprise Edition
IBM DB2 Connect Unlimited Edition for System i®
IBM DB2 Connect Unlimited Edition for System z®
IBM DB2 Connect Unlimited Advanced Edition for System z
IBM DB2 10.1 pureScale Feature
IBM DB2 10.5 Advanced Enterprise Server Edition
IBM DB2 10.5 Advanced Workgroup Server Edition
IBM DB2 10.5 Developer Edition for Linux, Unix and Windows

The IBM data server client and driver types are as follows:

IBM Data Server Driver Package
IBM Data Server Driver for JDBC and SQLJ
IBM Data Server Driver for ODBC and CLI
IBM Data Server Runtime Client
IBM Data Server Client

The following IBM V9.8 editions running on AIX and Linux:

IBM® DB2® pureScale™ Feature for Enterprise Server Edition


The recommended solution is to apply the appropriate fix for this vulnerability.

The fix for this vulnerability is available for download for DB2 and DB2 Connect release V10.1 FP4 from Fix Central. Releases V9.7 FP9, V10.1 FP3, and V10.5 FP3 will be updated with the fix and will be available from Fix Central as V9.7 FP9a, V10.1 FP3a, and V10.5 FP3a, respectively.

A special build with an interim patch for this issue may be requested for DB2 and DB2 Connect V9.5 FP9 & FP10, V9.7 FP8, V9.8 FP5 and V10.5 FP2. Please contact your service representative to request the special build and reference the APAR number for the release you want. I hCustomers on fixpack levels lower than those listed above should update to a fixed fix pack level.

DB2 and DB2 Connect V9.1 are no longer supported and therefore no patch will be made available. Please upgrade to a supported version of DB2 or DB2 Connect, as applicable, and apply the fix. Customers who have an extended support contract for this version may contact support to request a fix under the terms of their contract.

Java applications using JCC Type 2 driver will experience problems with V10.1 FP3a. It is recommended customers upgrade to V10.1 FP4 or contact their service representative to request for a special build.

The following does not apply if your DB2 application is using JDBC Type 4 driver. If you have IBM Data Server Client installed on a system, other than the database server, that uses TLS/SSL it is also vulnerable. To fix this for all DB2 releases, download and install an latest version of "IBM DB2 Support Files for SSL Functionality V10.1" from Passport Advantage® following the instructions available here:

Contact Technical Support:
In the United States and Canada dial 1-800-IBM-SERV
View the support contacts for other countries outside of the United States.
Electronically open a Service Request with DB2 Technical Support.

Note: IBM’s statements regarding its plans, directions, and intent are subject to change or withdrawal without notice at IBM’s sole discretion. Information regarding potential future products is intended to outline our general product direction and it should not be relied on in making a purchasing decision. The information mentioned regarding potential future products is not a commitment, promise, or legal obligation to deliver any material, code or functionality. Information about potential future products may not be incorporated into any contract. The development, release, and timing of any future features or functionality described for our products remains at our sole discretion.

Workarounds and Mitigations


Get Notified about Future Security Bulletins



Change History

May 26, 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.


Review the IBM security bulletin disclaimer and definitions regarding your responsibilities for assessing potential impact of security vulnerabilities to your environment.

Internal Use Only

PSIRT/Advisory (32345/1338) (35829/1718)

[{"Product":{"code":"SSEPGG","label":"Db2 for Linux, UNIX and Windows"},"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Component":"Security Vulnerability","Platform":[{"code":"PF002","label":"AIX"},{"code":"PF010","label":"HP-UX"},{"code":"PF016","label":"Linux"},{"code":"PF027","label":"Solaris"},{"code":"PF033","label":"Windows"}],"Version":"9.8;9.7;9.5;10.1;10.5","Edition":"Advanced Enterprise Server;Advanced Workgroup Server;Enterprise Server;Express;Express-C;Personal;Workgroup Server","Line of Business":{"code":"LOB10","label":"Data and AI"}},{"Product":{"code":"SSEPDU","label":"Db2 Connect"},"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Component":null,"Platform":[{"code":"PF002","label":"AIX"},{"code":"PF010","label":"HP-UX"},{"code":"PF016","label":"Linux"},{"code":"PF027","label":"Solaris"},{"code":"PF033","label":"Windows"}],"Version":"9.7;9.5;10.1;10.5","Edition":"Application Server;Enterprise Server;Personal;Unlimited for System i;Unlimited for System z","Line of Business":{"code":"LOB10","label":"Data and AI"}}]

Document Information

Modified date:
16 June 2018