Security Bulletin: Vulnerability in RC4 stream cipher affects IBM DB2 Recovery Expert for Linux, UNIX, and Windows (CVE-2015-2808)

Summary

The RC4 “Bar Mitzvah” Attack for SSL/TLS affects IBM DB2 Recovery Expert for Linux, UNIX, and Windows

Vulnerability Details

CVEID: CVE-2015-2808 DESCRIPTION: 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”.
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

IBM DB2 Recovery Expert for Linux, UNIX, and Windows V3.1 - V4.1

Remediation/Fixes

Replace existing JRE with JRE V7 SR9-Fix Pack 1 (<http://www-01.ibm.com/support/docview.wss?uid=swg21639279&gt;).

You can replace the IBM Runtime Environment, Java™ Technology Edition that is installed with IBM DB2 Recovery Expert for Linux, UNIX, and Windows with the latest IBM Runtime Environment, Java™ Technology Edition following the detailed instructions provided in the tech-note “Updating the JRE for DB2 Recovery Expert for Linux, UNIX and Windows”.

Workarounds and Mitigations

Disabling RC4. This can be achieved by adding RC4 to the list of disabled algorithms defined by the security property

_jdk.tls.disabledAlgorithms _

located in the file _<RE install directory>/jre/lib/security/java.security _.

Alternatively, the RC4 cipher can be disabled within the IBM WebSphere Application Server Liberty Profile** **component that is embedded with Recovery Expert by adding the property definition

com.ibm.jsse2.sp800-131=transition

in the file <RE install directory>/Config/dswebserver.properties

You should verify applying this configuration change does not cause any compatibility issues. Not disabling the RC4 stream cipher 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. ** **