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AUSCERT External Security Bulletin Redistribution
Security Bulletin: Vulnerability in RC4 stream cipher
affects IBM PowerVC (CVE-2015-2808)
20 April 2015
AusCERT Security Bulletin Summary
Product: IBM PowerVC Standard Edition
Operating System: Linux variants
Impact/Access: Access Privileged Data -- Remote/Unauthenticated
CVE Names: CVE-2015-2808
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Security Bulletin: Vulnerability in RC4 stream cipher affects IBM PowerVC
More support for:
PowerVC Standard Edition
1.2.0, 1.2.1, 1.2.2
The RC4 "Bar Mitzvah" Attack for SSL/TLS affects IBM PowerVC.
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
CVSS Base Score: 5
CVSS Temporal Score: See
https://exchange.xforce.ibmcloud.com/vulnerabilities/101851 for the current
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:N/C:P/I:N/A:N)
Affected Products and Versions
PowerVC Express Edition 18.104.22.168 through 22.214.171.124
PowerVC Express Edition 126.96.36.199 through 188.8.131.52
PowerVC Standard Edition 184.108.40.206 through 220.127.116.11
PowerVC Standard Edition 18.104.22.168 through 22.214.171.124
PowerVC Standard Edition 126.96.36.199 through 188.8.131.52
Update to PowerVC 184.108.40.206, 220.127.116.11, or 18.104.22.168 as necessary, then apply the
IT08230 interim fix that is appropriate for your chosen PowerVC version.
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
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Complete CVSS Guide
On-line Calculator V2
IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog
17 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.
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.
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