Security Bulletin
Summary
The RC4 “Bar Mitzvah” Attack for SSL/TLS affects DB2 QMF for Workstation. The RC4 algorithm, as used in the TLS protocol and SSL protocol, could allow a remote attacker to obtain sensitive information. An attacker could exploit this vulnerability to remotely expose account credentials without requiring an active man-in-the-middle session. Successful exploitation could allow an attacker to retrieve credit card data or other sensitive information. This vulnerability is commonly referred to as "Bar Mitzvah Attack".
Vulnerability Details
CVEID: CVE-2015-2808
CVSS Base Score: 5
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/101851 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:N/C:P/I:N/A:N)
Affected Products and Versions
- DB2 QMF Enterprise Edition Version 11 Release 1, Fix Pack 3 (and earlier)
- DB2 QMF for z/OS Version 11 Release 1, Fix Pack 3 (and earlier)
- DB2 QMF Enterprise Edition Version 10 Release 1, Fix Pack 11 (and earlier)
Remediation/Fixes
- DB2 QMF Enterprise Edition Version 11 Release 1: install QMF for Workstation 11.1 in Fix Pack 4
- DB2 QMF for z/OS Version 11 Release 1: install QMF for Workstation 11.1 in Fix Pack 4
- DB2 QMF Enterprise Edition Version 10 Release 1: install Java 6.0 SR16FP3 fix available via IBM Fix Central
You should verify applying this fix does not cause any compatibility issues. The fix disables RC4 stream cipher by default. If you change this setting you will expose yourself to the attack described above. IBM recommends that you review your entire environment to identify other areas where you have enabled the RC4 stream cipher and take appropriate mitigation and remediation actions.
Workarounds and Mitigations
Important note: IBM strongly suggests that all System z customers subscribe to the System z Security Portal to receive the latest critical System z security and integrity service. If you are not subscribed, see the instructions on the System z Security web site. Security and integrity APARs and associated fixes will be posted to this portal. IBM suggests reviewing the CVSS scores and applying all security or integrity fixes as soon as possible to minimize any potential risk.
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References
*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.
Disclaimer
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:
16 June 2018
UID
swg21883065