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AUSCERT External Security Bulletin Redistribution
ESB-2015.1155
Security Bulletin: Vulnerability in RC4 stream cipher
affects IBM Cognos Controller (CVE-2015-2808)
28 April 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: IBM Cognos Controller
Publisher: IBM
Operating System: Windows
Impact/Access: Access Privileged Data -- Remote/Unauthenticated
Resolution: Mitigation
CVE Names: CVE-2015-2808
Reference: ESB-2015.1154
ESB-2015.1153
ESB-2015.1150
ESB-2015.1149
ESB-2015.1148
ESB-2015.1147
Original Bulletin:
http://www-01.ibm.com/support/docview.wss?uid=swg21883682
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Security Bulletin: Vulnerability in RC4 stream cipher affects IBM Cognos
Controller (CVE-2015-2808)
Document information
More support for:
Cognos Controller
Software version:
8.5, 8.5.1, 10.1, 10.1.1, 10.2.0, 10.2.1
Operating system(s):
Windows
Reference #:
1883682
Modified date:
2015-04-27
Security Bulletin
Summary
The RC4 Bar Mitzvah Attack for SSL/TLS affects IBM Cognos Controller
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 Cognos Controller 10.2.1
IBM Cognos Controller 10.2
IBM Cognos Controller 10.1.1
IBM Cognos Controller 10.1
IBM Cognos Controller 8.5.1
IBM Cognos Controller 8.5
Remediation/Fixes
None
Workarounds and Mitigations
The RC4 cipher suites must be disabled using Cognos Configuration by
performing the following actions:
1) Start Cognos Configuration
2) Navigate to Security/Cryptography/Cognos
3) Open the supported cipher suites selection dialog
4) Select all cipher suites that have RC4 in the the name and remove them from
the Current Values List. Select OK to save the new list.
5) Save and restart your service using Cognos Configuration.
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.
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References
Complete CVSS Guide
On-line Calculator V2
Related information
IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog
Change History
27 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
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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