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Security Bulletin: Vulnerability in Diffie-Hellman ciphers affects Rational Developer for i, Rational Developer for AIX and Linux and Rational Developer for Power Systems Software (CVE-2015-4000)

Created by Maha Masri on
Published URL:
https://www.ibm.com/support/pages/node/533897
533897

Security Bulletin


Summary

The Logjam Attack on TLS connections using the Diffie-Hellman (DH) key exchange protocol affects Rational Developer for i, Rational Developer for AIX and Linux, and Rational Developer for Power Systems Software.

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

Product Name

Versions Affected
Rational Developer for Power Systems Software8.0, 8.0.0.1, 8.0.0.2, 8.0.0.3, 8.0.3, 8.0.3.1, 8.5, 8.5.1
Rational Developer for i9.0, 9.0.0.1, 9.0.1, 9.1, 9.1.1, 9.1.1.1
Rational Developer for AIX and Linux, AIX COBOL Edition9.0, 9.0.0.1, 9.0.1, 9.1, 9.1.1
Rational Developer for AIX and Linux, C/C++ Edition9.0, 9.0.0.1, 9.0.1, 9.1, 9.1.1

Remediation/Fixes

Product

VRMFRemediation/First Fix
Rational Developer for Power Systems Software8.0 through 8.5.1
Rational Developer for i9.0 through to 9.1
Rational Developer for AIX and Linux9.0 through to 9.1

Workarounds and Mitigations

None.

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.

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References

Complete CVSS v2 Guide
On-line Calculator v2

Off

Related Information

IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog

Acknowledgement

Reported to IBM by The WeakDH team at https://weakdh.org

Change History

* 31 July 2015: Original copy 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.

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Document Information

Modified date:
02 August 2018

UID

swg21963412

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