Security Bulletin: Vulnerability in RC4 stream cipher affects IBM Flex System Manager (FSM) (CVE-2015-2808)

Vulnerability Details

Summary

The RC4 Bar Mitzvah Attack for SSL/TLS affects IBM Flex System Manager (FSM).

Vulnerability Details:

CVE-ID: 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 obtain sensitive information. This vulnerability is commonly referred to as "Bar Mitzvah Attack."

CVSS Base Score: 5
CVSS Temporal Score: See http://exchange.xforce.ibmcloud.com/vulnerabilities/101851 for current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:N/C:P/I:N/A:N)

Affected products and versions

• Flex System Manager 1.1.x.x
• Flex System Manager 1.2.0.x
• Flex System Manager 1.2.1.x
• Flex System Manager 1.3.0.x
• Flex System Manager 1.3.1.x
• Flex System Manager 1.3.2.x
• Flex System Manager 1.3.3.x
• Flex System Manager 1.3.4.x

Remediation/Fixes:

You should verify applying this fix does not cause any compatibility issues. The fix disables RC4 stream cipher by default. If you change the default setting after applying the fix, 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:

None

References:

• Complete CVSS v2 Guide
• On-line Calculator v2

Related Information:
IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog

Acknowledgement

None

Change History
30 September 2015: Original Version Published
02 December 2015: Added Remediations for 1.3.4

* 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.