Security Bulletin
Summary
The Logjam Attack on TLS(Transport Layer Security) connections using the Diffie-Hellman (DH) key exchange protocol affects IMS™ Enterprise Suite: SOAP Gateway.
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
The SOAP Gateway component of the IMS™ Enterprise Suite Versions 3.1 and earlier.
Workarounds and Mitigations
Java 7 and Java 8 Mitigation:
1. Disabling DH and DHE cipher suites. The 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
SSL_DHE_RSA_WITH_AES_256_CBC_SHA256
SSL_DHE_DSS_WITH_AES_256_CBC_SHA256
SSL_DHE_RSA_WITH_AES_256_CBC_SHA
SSL_DHE_DSS_WITH_AES_256_CBC_SHA
SSL_DHE_RSA_WITH_AES_128_CBC_SHA256
SSL_DHE_DSS_WITH_AES_128_CBC_SHA256
SSL_DHE_RSA_WITH_AES_128_CBC_SHA
SSL_DHE_DSS_WITH_AES_128_CBC_SHA
SSL_DHE_DSS_WITH_AES_256_GCM_SHA384
SSL_DHE_RSA_WITH_AES_256_GCM_SHA384
SSL_DHE_RSA_WITH_AES_128_GCM_SHA256
SSL_DHE_DSS_WITH_AES_128_GCM_SHA256
SSL_DHE_RSA_WITH_3DES_EDE_CBC_SHA
SSL_DHE_DSS_WITH_3DES_EDE_CBC_SHA
SSL_DH_anon_WITH_AES_256_GCM_SHA384
SSL_DH_anon_WITH_AES_128_GCM_SHA256
SSL_DH_anon_WITH_AES_256_CBC_SHA256
SSL_DH_anon_WITH_AES_256_CBC_SHA
SSL_DH_anon_WITH_AES_128_CBC_SHA256
SSL_DH_anon_WITH_AES_128_CBC_SHA
SSL_DH_anon_WITH_3DES_EDE_CBC_SHA
SSL_DH_anon_WITH_RC4_128_MD5
SSL_DHE_RSA_WITH_DES_CBC_SHA
SSL_DHE_DSS_WITH_DES_CBC_SHA
SSL_DH_anon_WITH_DES_CBC_SHA
SSL_DHE_DSS_WITH_RC4_128_SHA
SSL_DHE_RSA_EXPORT_WITH_DES40_CBC_SHA
SSL_DHE_DSS_EXPORT_WITH_DES40_CBC_SHA
SSL_DH_anon_EXPORT_WITH_DES40_CBC_SHA
You should verify applying this configuration change does not cause any compatibility issues. 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.
Important note: IBM strongly suggests that all System z customers subscribe 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..
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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
*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:
01 June 2022
UID
swg21959609