Security Bulletin: Vulnerability in RC4 stream cipher affects IBM Tivoli Composite Application Manager for Transactions (CVE-2015-2808)

Summary

The RC4 “Bar Mitzvah” Attack for SSL/TLS affects IBM Tivoli Composite Application Manager for Transactions.

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 retrieve credit card data or other sensitive information.

This vulnerability is commonly referred to as “Bar Mitzvah Attack”.

CVSS Base Score: 5.00
CVSS Temporal Score: 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 Tivoli Composite Application Manager (ITCAM) for Transactions is affected. ITCAM for Transactions contains multiple sub components (Agents).
Both the Internet Service Monitor (ISM – Agent code ‘IS’) and the Robotic Response Time (RRT – Agent code ‘T6’) are affected.

ISM Versions:
· 7.4 – Affected by CVE (CVE-2015-2808)
· 7.3 – Affected by CVE (CVE-2015-2808)
· 7.2 – Affected by CVE (CVE-2015-2808)

RRT Versions:
· 7.4 – Affected by CVE (CVE-2015-2808)
· 7.3 – Affected by CVE (CVE-2015-2808)
· 7.2 – Affected by CVE (CVE-2015-2808)
· 7.1 – Affected by CVE (CVE-2015-2808)

Remediation/Fixes

ISM Fixes

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

For ISM disable the RC4 ciphers in all monitors. To disable the RC4 ciphers, update the monitor properties: SSLCipherSuite and BridgeSSLCipherSet. For example, to disable RC4 ciphers in the HTTPS monitor, update the https.props file to include

SSLCipherSuite : “AES:3DES:DES:!EXP”
BridgeSSLCipherSet : “AES:3DES:DES:!EXP”