Security Bulletin
Summary
The Logjam Attack on TLS connections using the Diffie-Hellman (DH) key exchange protocol affects the IBM Installation Manager and IBM Packaging Utility.
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
IBM Installation Manager and IBM Packaging Utility versions 1.8.3 and earlier.
Remediation/Fixes
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1.7.4.3 IBM Packaging Utility Remediation Please note that the 1.7.4.3 fix is intended for upgrade of 1.7.4.2 and earlier versions which continue support on platforms that are NOT supported by 1.8 or later versions. Users running 1.7.4.2 or earlier version on platforms that ARE supported by 1.8.x version, should upgrade to 1.8.3 and implement the work around described below. |
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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
For the 1.8.x releases, you can work around this vulnerability by disabling DH and DHE cipher suites. This can be achieved by adding the DH and DHE cipher suites to the list of disabled algorithms defined by the jdk.tls.disabledAlgorithms security property in java.security file. This does NOT include ciphers that have ECDH or ECDHE in the name; these are elliptic curve Diffie-Hellman ciphers and they are not affected.
For the IBM Installation Manager:
You will find the java.security file in the following folder, by platform:
- AIX Platforms: <Installation Manager install_dir>/eclipse/jre_<version>/jre/lib/security/
- HP-UX Platforms: <Installation Manager install_dir>/eclipse/jre_<version>/jre/lib/security/
- Linux and Solaris Platforms: <Installation Manager install_dir>/eclipse/jre_<version>/jre/lib/security/
- Windows Platforms: <Installation Manager install_dir>\eclipse\jre_<version>\jre\lib\security\
- Mac OSX Platforms: <Installation Manager install_dir>/eclipse/jre_<version>/jre/Contents/Home/lib/security/
For the IBM Packaging Utility:
You will find the java.security file in the following folder, by platform:
- AIX Platforms: <Packaging Utility install_dir>/jre/lib/security/
- Linux and Solaris Platforms: <Packaging Utility install_dir>/jre/lib/security/
- Windows Platforms: <Packaging Utility install_dir>\jre\lib\security\
- Mac OSX Platforms: <Packaging Utility install_dir>/jre/Contents/Home/lib/security/
Get Notified about Future Security Bulletins
Important Note
IBM strongly suggests that all System z customers be subscribed to the System z Security Portal to receive the latest critical System z security and integrity service. If you are not subscribed, see the instructions on the System z Security web site. Security and integrity APARs and associated fixes will be posted to this portal. IBM suggests reviewing the CVSS scores and applying all security or integrity fixes as soon as possible to minimize any potential risk.
References
Acknowledgement
Reported to IBM by The WeakDH team at https://weakdh.org
Change History
10 December 2015: Added link for the 1.8.4 version
01 July 2015: Added details for applying the 1.7.4.3 fix for 1.0 through 1.7.4.2 versions
10 June 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.
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Document Information
Modified date:
25 October 2021
UID
swg21959610