Security Bulletin: Multiple vulnerabilities affect db2exmig and db2exfmt tools shipped with IBM® Db2® (CVE-2018-1544, CVE-2018-1565)

Summary

The Db2 tools db2exmig and db2exfmt are affected by a buffer overflow vulnerability. As installed these tools do not run with elevated privileges (setuid) and when called directly the vulnerability does not lead to privilege escalation. However, if a customer’s own application or script runs with elevated privileges and executes db2exmig or db2exfmt, the vulnerability may lead to privilege escalation. These tools are not called by Db2 in such a manner. The vulnerability only exists for local users, it cannot be remotely exploited.

Vulnerability Details

CVEID: CVE-2018-1544 DESCRIPTION: IBM DB2 for Linux, UNIX and Windows (includes DB2 Connect Server) could allow a local user to overflow a buffer which in special circumstances may result in a privilege escalation to the DB2 instance owner.
CVSS Base Score: 8.4
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/142648 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)

CVEID: CVE-2018-1565 DESCRIPTION: IBM DB2 for Linux, UNIX and Windows (includes DB2 Connect Server) could allow a local user to overflow a buffer which may result in a privilege escalation to the DB2 instance owner.
CVSS Base Score: 8.4
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/143022 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

All fix pack levels of IBM Db2 V9.7, V10.1, V10.5, and V11.1 editions on all platforms are affected.

Remediation/Fixes

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

FIX:
The fix for DB2 V11.1 is in V11.1.3.3 iFix001, available for download from Fix Central.

Customers running any vulnerable fixpack level of an affected Program, V9.7, V10.1, and V10.5, 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, V10.1 FP6, and V10.5 FP9. They can be applied to any affected fixpack level of the appropriate release to remediate this vulnerability.

AIX 64-bit
HP-UX 64-bit
Linux 32-bit, x86-32
Linux 64-bit, x86-64
Linux 64-bit, POWER™ big endian
Linux 64-bit, System z®, System z9® or zSeries®
Solaris 64-bit, SPARC
Solaris 64-bit, x86-64
Windows 32-bit, x86
Windows 64-bit, x86

V10.1 | TBD | IT24803 | Special Build for V10.1 FP6:

AIX 64-bit
HP-UX 64-bit
Linux 32-bit, x86-32
Linux 64-bit, x86-64
Linux 64-bit, POWER™ big endian
Linux 64-bit, System z®, System z9® or zSeries®
Solaris 64-bit, SPARC
Solaris 64-bit, x86-64
Windows 32-bit, x86
Windows 64-bit, x86

V10.5 | FP10 | IT24802 | <https://www-01.ibm.com/support/docview.wss?uid=swg24045012&gt;
V11.1.3.3 | iFix001 | IT24799 | <http://www-01.ibm.com/support/docview.wss?uid=swg24044872&gt;

Workarounds and Mitigations

Customers can delete db2exmig and db2exfmt if not using these tools.