Security Bulletin: IBM® DB2® contains a file disclosure vulnerability using a SELECT statement with XML/XSLT function (CVE-2014-8910)

Summary

IBM DB2 contains a file disclosure vulnerability. A remote, authenticated DB2 user could exploit this vulnerability by executing a specially-crafted SELECT statement with XML/XSLT function to read arbitrary text files owned by the DB2 instance owner. On Windows, the attacker is able to read arbitrary text files on the system.

Vulnerability Details

CVEID: CVE-2014-8910 **
DESCRIPTION:** IBM DB2 contains a file disclosure vulnerability. A remote, authenticated DB2 user could exploit this vulnerability by executing a specially-crafted SELECT statement with XML/XSLT function to read arbitrary text files owned by the DB2 instance owner. On Windows, the attacker is able to read arbitrary text files on the system.

CVSS Base Score: 4
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/99251 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:S/C:P/I:N/A:N)

Affected Products and Versions

All fix pack levels of IBM DB2 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 been created.

IBM® DB2® pureScale™ Feature for Enterprise Server Edition, V9.8, running on AIX or Linux is affected.

Remediation/Fixes

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

FIX:

The fix for DB2 and DB2 Connect release V9.7 is in FP11, V10.1 is in V10.1 FP5 and V10.5 is in V10.5 FP6, available for download from Fix Central.

Customers running any vulnerable fixpack level of an affected Program, V9.8 can contact support to obtain a special build containing an interim fix for this issue. These special builds are available based on the most recent fixpack level for each impacted release: DB2 V9.8 FP5. They can be applied to any affected fixpack level of the appropriate release to remediate this vulnerability. Additionally fixes based on DB2 V9.7 FP10, DB2 V10.1 FP4 or V10.5 FP5 will be made available on request.

Refer to the folowing chart to determine how to proceed to obtain a needed fixpack or special build.

If you do not need to use DOCTYPE in XML statement, you can follow the step below to disable usage of DOCTYPE by setting the environment variable DB2_XML_DISALLOW_DOCTYPE after applying the appropriate fix pack or special build.

As a user with DB2 SYSADM privilege, run the following commands:

db2set DB2_XML_DISALLOW_DOCTYPE=YES

db2stop
db2start

Upon setting the environment variable, any usage of DOCTYPE in XML statement will return SQL16168N RC=11 SQLSTATE 2200M error.

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

None