Security Bulletin: Vulnerability in RC4 stream cipher affects IBM Cognos Insight (CVE-2015-2808)

Summary

The RC4 “Bar Mitzvah” Attack for SSL/TLS affects IBM Cognos Insight

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

Cognos Insight 10.2
Cognos Insight 10.2.1
Cognos Insight 10.2.2

Remediation/Fixes

Cognos Insight Standard Edition 10.2 Fix Pack 1 Interim Fix 4

Cognos Insight Standard Edition 10.2.1 Fix Pack 2 Interim Fix 4

Cognos Insight Standard Edition 10.2.2 Fix Pack 4

Workarounds and Mitigations

To mitigate the vulnerability in the xulrunner embedded browser:

1.1) Locate Cognos Insight installation directory.
1.2) For all directories matching <installation_directory>\plugins\com.ibm.cognos.isv.xulrunner.win32.*
1.3) Open file <installation_directory>\plugins\com.ibm.cognos.isv.xulrunner.win32.*\xulrunner\greprefs.js with a text editor
1.4) For each RC4 cipher which is set to ‘true’ change the value to ‘false’

e.g.

line:

pref(“security.ssl3.rsa_rc4_128_md5”, true);

becomes:

pref(“security.ssl3.rsa_rc4_128_md5”, false);

To fully mitigate the risk to this vulnerability, IBM recommended that Cognos Insight customers pick up the latest Cognos TM1 fixes. These fixes disable RC4 ciphers on TM1 Server .

IBM Cognos TM1 9.5.2 Fix Pack 3 Interim Fix 7

IBM Cognos TM1 10.1.1.2 Interim Fix 4

IBM Cognos TM1 10.2.0.2 Interim Fix 4

IBM Cognos TM1 10.2.2 FP3

IBM also highly recommends that if Cognos Insight connects to any TM1 Planning Service , the following steps should be performed:

2.1) Start Cognos Configuration

2.2) Navigate to Security/Cryptography/Cognos

2.3) Open the supported cipher suites selection dialog

2.4) 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.

2.5) 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…