Security Bulletin
Summary
The RC4 “Bar Mitzvah” Attack for SSL/TLS affects IBM WebSphere Cast Iron Solution(CVE-2015-2808)
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
This vulnerability affects all versions of the product
WebSphere Cast Iron v 7.0,0,x,
WebSphere Cast Iron v 6.4.0.x
WebSphere Cast Iron v 6.3.0.x
WebSphere Cast Iron v 6.1.0.x
WebSphere Cast Iron v 6.0.0.x
Remediation/Fixes
|
Product | VRMF | APAR | Remediation/First Fix |
| Cast Iron Appliance | 7.* | LI78552 | iFix 7.0.0.2-CUMUIFIX-011 |
| Cast Iron Appliance | 6.4.0.x | LI78552 | iFix 6.4.0.1-CUMUIFIX-028 |
| Cast Iron Appliance | 6.3.0.x | LI78552 | iFix 6.3.0.2-CUMUIFIX-013 |
| Cast Iron Appliance | 6.1.0.x | LI78552 | iFix 6.1.0.15-CUMUIFIX-020 |
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
Customers on Cast Iron v6.0.0.x should contact IBM Support for migrating to one of the remediated releases.
Appliance is upgraded with script changes.
For Studio and Secure connectors, to disable the RC4 stream cipher do the following:
Studio
Go to the the location studio is installed
<installation directory>\jre\lib\security\java.security
Add RC4 to the list of disabled TLS algorithms specified by the property jdk.tls.disabledAlgorithms. For example:
jdk.tls.disabledAlgorithms=SSLv3, RC4
For Secure connectors
Go to the the location where secure connector is installed
Windows: <installation directory>\jre\jre\lib\security\java.security
Linux : <installation directory>\jre\lib\security\java.security
Add RC4 to the list of disabled TLS algorithms specified by the property jdk.tls.disabledAlgorithms. For example:
jdk.tls.disabledAlgorithms=SSLv3, RC4
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.
Get Notified about Future Security Bulletins
References
Change History
20-April-2015: Original Version Published
*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:
15 June 2018
UID
swg21883263