Security Bulletin: Vulnerability in Diffie-Hellman ciphers affects TS3100/TS3200 (CVE-2015-4000)

Security Bulletin

Summary

The Logjam Attack on TLS connections using the Diffie-Hellman (DH) key exchange protocol affects TS3100/TS3200.

Vulnerability Details

CVEID: CVE-2015-4000
DESCRIPTION: 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 https://exchange.xforce.ibmcloud.com/vulnerabilities/103294 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

Versions below C.80.

Remediation/Fixes

Upgrade to version C.80 or later.

As the length of the server key size are increased, the amount of CPU required for full TLS/SSL handshake can significantly increase. Please carefully test and assess the impact to your CPU requirements to ensure sufficient CPU resources, otherwise the system availability may be impacted.

You should verify applying this configuration change does not cause any compatibility issues. 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 Diffie-Hellman key-exchange protocol used in TLS and take appropriate mitigation and remediation actions.

Workarounds and Mitigations

None

Get Notified about Future Security Bulletins

Subscribe to My Notifications to be notified of important product support alerts like this.

References

Complete CVSS v2 Guide
On-line Calculator v2

Off

Change History

01 September 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

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

{"0":{"Product":{"code":"SSF1OOQ","label":"TS3200 Tape Library"},"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Component":"Not Applicable","Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"Version Independent","Edition":"N\/A","Line of Business":{"code":"LOB26","label":"Storage"}},"106":{"Product":{"code":"SSYYDOM","label":"TS3100 Tape Library"},"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Line of Business":{"code":"LOB26","label":"Storage"}},"1":null,"2":null,"3":null,"4":null,"5":null,"6":null,"7":null,"8":null,"9":null,"10":null,"11":null,"12":null,"13":null,"14":null,"15":null,"16":null,"17":null,"18":null,"19":null,"20":null,"21":null,"22":null,"23":null,"24":null,"25":null,"26":null,"27":null,"28":null,"29":null,"30":null,"31":null,"32":null,"33":null,"34":null,"35":null,"36":null,"37":null,"38":null,"39":null,"40":null,"41":null,"42":null,"43":null,"44":null,"45":null,"46":null,"47":null,"48":null,"49":null,"50":null,"51":null,"52":null,"53":null,"54":null,"55":null,"56":null,"57":null,"58":null,"59":null,"60":null,"61":null,"62":null,"63":null,"64":null,"65":null,"66":null,"67":null,"68":null,"69":null,"70":null,"71":null,"72":null,"73":null,"74":null,"75":null,"76":null,"77":null,"78":null,"79":null,"80":null,"81":null,"82":null,"83":null,"84":null,"85":null,"86":null,"87":null,"88":null,"89":null,"90":null,"91":null,"92":null,"93":null,"94":null,"95":null,"96":null,"97":null,"98":null,"99":null,"100":null,"101":null,"102":null,"103":null,"104":null,"105":null}

Tips

Security Bulletin: Vulnerability in Diffie-Hellman ciphers affects TS3100/TS3200 (CVE-2015-4000)