IT27203: SECURITY: PRIVILEGE ESCALATION DURING ROUTINE EXECUTION IN FENCED MODE (CVE-2019-4057)

Db2 Version 11.1 Mod 4 Fix Pack 5 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod 4 Fix Pack 6 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod 4 Fix Pack 7 for Linux, UNIX, and Windows

APAR status

• Closed as program error.

Error description

• Db2 allows instance owner to change the fenced user to root and
  causes any fenced routines to execute with elevated privilege.
  See Security Bulletin for details:
  http://www.ibm.com/support/docview.wss?uid=ibm10880735
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * All DB2 systems on all Linux and Unix platforms at service   *
  * levels Version 11.1 GA  through to Version 11.1 Fix Pack 4   *
  * iFix001.                                                     *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * See Error Description                                        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * Upgrade to Db2 Version 11.1.4 Fix Pack 5.                    *
  ****************************************************************
  

Problem conclusion

• The complete fix for this problem first appears in Db2 Version
  11.1.4 Fix Pack 5 and the subsequent Fix Packs.
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

  IT27192

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  DB2 FOR LUW

• Fixed component ID

  DB2FORLUW

Applicable component levels

• RB10 PSN

     UP