Summary


GSKit is an IBM component that is used by Blueworx Voice Response since Fix Pack 8 (Fix level 6.1.0.450). The GSKit that is shipped with Blueworx Voice Response contains multiple security vulnerabilities including the “The RC4 Bar Mitzvah Attack” TLS/SSL client and server vulnerability. Blueworx Voice Response has addressed the applicable CVE.


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


Blueworx Voice Response for AIX V6.1 (also known as WebSphere Voice Response for AIX V6.1)


Remediation/Fixes


Blueworx Voice Response V6.1 fix level 6.1.0.504

APAR: IV72487


Fix Center download link:
BVR610.ML5.fix500-519.tar.Z

You should verify applying this fix does not cause any compatibility issues.



Workarounds and Mitigations


Log in as dtuser.
Update $SYS_DIR/voip/cipher.ini to add comments (#) at the start of the following lines:

TLS_RSA_WITH_RC4_128_SHA
TLS_ECDHE_RSA_WITH_RC4_128_SHA
TLS_ECDHE_ECDSA_WITH_RC4_128_SHA


Note each line may occur multiple times and each occurrence should be commented out.


Now shutdown and restart BVR.



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References


Related information



*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


According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES "AS IS" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.