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Security Bulletin: Privilege escalation vulnerability affects IBM® Db2® Administrative Task Scheduler (CVE-2018-1711).

Security Bulletin


Db2 Administrative Task Scheduler (ATS) is vulnerable to a privilege escalation attack. A user with appropriate authorization can modify the contents of the control tables used by the ATS to permit unauthorized access to user data. Unauthorized access includes both access to authorizations held by other users as well as RCAC row permissions and column masks.

Vulnerability Details

CVEID: CVE-2018-1711
DESCRIPTION: IBM DB2 for Linux, UNIX and Windows (includes DB2 Connect Server) could allow a local user to to gain privileges due to allowing modification of columns of existing tasks.
CVSS Base Score: 8.4
CVSS Temporal Score: See 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.


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


The fix for DB2 release V11.1 is in V11.1.4.4 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 FP10. They can be applied to any affected fixpack level of the appropriate release to remediate this vulnerability.

Workarounds and Mitigations

If you rely on ATS, the only solution is to apply the fix, but you may consider using the Db2 or other audit facility to ensure no malicious changes are made to the affected tables. If ATS is turned off, you are not vulnerable. 

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Change History

September 18, 2018: Original version published.
October 4, 2018: Fixed the incorrect number in the link to the 10.1 and 9.7 builds.
October 15, 2018: Updated link to Db2 V10.5 Windows 64-bit image.
November 28, 2018: Updated 11.1 version with a link to image.
March 11, 2019: Updated build numbers to a later special builds with updated fix addressed by APARs IT27411 (for V9.7), IT27410 (for V10.1), IT27385 (for V 10.5), IT27409 (for V11). Updated the FixCentral link for Db2 V11 to point to V11.1.4.4 iFix001 which contains the APAR IT27409. The original fix for this vulnerability revealed an underlying (non-security) issue that is addressed in this update.
March 6, 2020: Updated 10.5 version with a link to 10.5 FP11 image.

*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.

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Document Information

Modified date:
06 March 2020