Security Bulletin: Local escalation of privilege vulnerability in IBM® DB2® (CVE-2016-5995).

Summary

A vulnerability in IBM DB2 for Linux, Unix and Windows could allow a local user to gain elevated privilege.

Vulnerability Details

CVEID: CVE-2016-5995**
DESCRIPTION:** DB2 for Linux, Unix and Windows is vulnerable to a privilege escalation due to loading libraries from insecure locations. A local user could place a malicious library in a location that a SETGID or SETUID binary would execute and gain root level access.
CVSS Base Score: 8.4
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/116653 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)

Affected Products and Versions

The following IBM DB2 and DB2 Connect editions running on AIX, Linux and HP are vulnerable.

BM® 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® Direct Advanced Edition
IBM® DB2® Direct Standard 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 IBM data server client and driver types are as follows:

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

The following table details which DB2 release, fixpacks and platforms are affected:

Remediation/Fixes

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

FIX:
The fix for DB2 and DB2 Connect is in V10.1 FP6, V10.5 FP8 and V11.1.1 FP1, available for download from Fix Central.

Customers running any vulnerable fixpack level of an affected Program, V9.7 can download the special build containing the interim fix for this issue from Fix Central. These special builds are available based on the most recent fixpack level for each impacted release: DB2 V9.7 FP11. They can be applied to any affected fixpack level of the appropriate release to remediate this vulnerability.

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

Workarounds and Mitigations

The following remediation instructions will remove the vulnerability without side-effects. The user executing the commands must be root and the instructions must be repeated for each DB2 instance and in the DB2 install directory.

The following example will use /home/db2inst1/sqllib as the DB2 instance install directory. You should replace the sample directory with your DB2 instance install directory. Repeat the procedure with the DB2 install directory which is under /opt/ibm/db2/<db2_release_name> or /opt/IBM/db2/<db2_release_name>, depending on the platform.

The following will fix the install component that exists at the DB2 client and server.

cd /home/db2inst1/sqllib
bin/db2chglibpath -s ‘\.:’ -r ‘’ adm/db2iclean