IBM Support

Security Bulletin: Vulnerability in Diffie-Hellman ciphers affects Tivoli Storage Manager FastBack for Workstations (CVE-2015-4000)

Security Bulletin


The Logjam Attack on TLS connections using the Diffie-Hellman (DH) key exchange protocol affects Tivoli Storage Manager FastBack for Workstations. The TSM FastBack for Workstations Central Administration Console (CAC) has a security vulnerability in the underlying IBM WebSphere and IBM WebSphere Liberty Server

Vulnerability Details

CVEID: CVE-2015-4000
The TLS protocol could allow a remote attacker to obtain sensitive information, caused by the failure to properly convey a DHE_EXPORT ciphersuite choice. An attacker could exploit this vulnerability using man-in-the-middle techniques to force a downgrade to 512-bit export-grade cipher. Successful exploitation could allow an attacker to recover the session key as well as modify the contents of the traffic. This vulnerability is commonly referred to as "Logjam".
CVSS Base Score: 4.3
CVSS Temporal Score: See for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:M/Au:N/C:P/I:N/A:N)

Affected Products and Versions

The following versions of Tivoli Storage Manager for Workstations Central Administration Console are affected: through 7.1.2.n through

Workarounds and Mitigations

Tivoli Storage Manager FastBack for Workstations Central Administration Console
Version 6.3, 7.1.0

    You will need to remove any of the ciphers that begin with SSL_* or TLS_* and contain DH, DHE in the name from your WebSphere Application Server SSL configuration.

    You can view the administrative console page to change the settings, click Security > SSL certificate and key management. Under Configuration settings, click Manage endpoint security configurations > {Inbound | Outbound} > ssl_configuration. Under Related items, click SSL configurations > . Click on {SSL_configuration_name }. Under Additional Properties, click Quality of protection (QoP) settings.
    Perform a restart on the Tivoli Integrated Portal Service after saving the setting above.
Version 7.1.1, 7.1.2
    1. Open the file for editing. The file will be located in the Tivoli Storage Manager FastBack for Workstations Central Administration Console install directory\java\jre\lib\security.
    2. Add the following line or additional ciphers need to be added to the existing list: jdk.tls.disabledAlgorithms=DH, DHE
    3. In Control Panel -> Administrative Tools -> Service, stop and then restart the TSM FastBack for Workstations Central Administration Console service

At this point the application will not allow DH or DHE stream ciphers. You should verify applying this configuration change does not cause any compatibility issues. Not disabling the DH or DHE stream ciphers 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 DH or DHE stream ciphers and take appropriate mitigation and remediation actions.

Get Notified about Future Security Bulletins



Change History

23 June 2015, created
09 September 2015, added remediation/fixes
16 February 2016, added fix links

*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.


Review the IBM security bulletin disclaimer and definitions regarding your responsibilities for assessing potential impact of security vulnerabilities to your environment.

[{"Product":{"code":"SS6PEB","label":"Tivoli Storage Manager FastBack for Workstations"},"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Component":"--","Platform":[{"code":"PF033","label":"Windows"}],"Version":"6.3;7.1","Edition":"All Editions","Line of Business":{"code":"LOB26","label":"Storage"}}]

Document Information

Modified date:
17 June 2018