Security Bulletin: Vulnerability in RC4 stream cipher affects Tivoli Storage Manager Administration Center (CVE-2015-2808)

Summary

The RC4 “Bar Mitzvah” Attack for SSL/TLS affects Tivoli Storage Manager Administration Center

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

Tivoli Storage Manager Administration Center 6.1, 6.2, and 6.3.

Remediation/Fixes

The recommended solution for Administration Center V6.3 is to apply the WAS fix pack. See the instructions below to obtain and install the fix pack.

The recommended solution for Administration Center V6.1 or V6.2 is to upgrade to V6.3 ( Download Tivoli Storage Manager Administration Center V6.3) and apply the WAS fix pack. If customers are unable to do this they should contact support.

The V6.3 Administration Center can manage servers running Tivoli Storage Manager V6.1, V6.2, and V6.3. As an alternative, you can use the administrative command-line client instead of the Administration Center.

Installation Instructions

1. Stop the TIP/WAS server. This server cannot be running while you apply the fix pack. (Starting and Stopping TIP)
2. Ensure that the IBM Update Installer is installed. The Update Installer is required to apply the fix pack. (IBM Update Installer)
3. Download the appropriate WAS Embedded fix pack package from the Downloads section of this page.
4. Run the IBM Update Installer to install the fix pack.
5. Start the TIP/WAS server.

Downloads
For V6.3, download WAS Fix Pack 37 (7.0.0.37)
AIX:
7.0.0-WS-WASEmbeded-AixPPC32-FP0000037.pak
Linux:
7.0.0-WS-WASEmbeded-LinuxX32-FP0000037.pak
Solaris:
7.0.0-WS-WASEmbeded-SolarisSparc-FP0000037.pak
Windows:
7.0.0-WS-WASEmbeded-WinX32-FP0000037.pak

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

For WebSphere Application Server Full Profile, modifying the server’s SSL configuration to disable SSLv3 can be done from either the Admin console or with an Admin task from wsadmin.

On the Admin Console

1. Go to Security > SSL certificate and key management > SSL configurations
2. The collection of all SSL configurations is listed. For each SSL configuration in the list the SSL protocol will need to be modified to use TLS.
3. Select an SSL Configuration then click Quality of protection (QoP) settings under Additional Properties on the right.
4. On the Quality of protection (QoP) settings panel select TLS form the pull down list in the box labeled Protocol.
5. Apply/Save.

Using wsadmin (does not apply to WebSphere Application Server 6.0.2)
If using wsadmin for each SSL Configuration the modifySSLConfig task will need to be called.

To get the list of SSL Configuration in wsadmin call

wsadmin> AdminTask.listSSLConfigs(‘[-all true]’)

To modify a SSL configuration from wsadmin call

wsadmin>AdminTask.modifySSLConfig(‘[-alias <fill in the SSL Configuration alias> -scopeName <fill in the SSL Configuration management scope> -sslProtocol TLS]’)

wsadmin>AdminConfig.save()

The following is an example of what a modifySSLConfig command looks like with an alias and scope provided.

wsadmin>AdminTask.modifySSLConfig(‘[-alias CellDefaultSSLSettings -scopeName (cell):ndcell -sslProtocol TLS ]’)

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