Security Bulletin
Summary
A port used by Operations Center is reported to be vulnerable to Logjam (CVE-2015-4000).
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)
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 Spectrum Protect Operations Center affected levels are 8.1.3 through 8.1.7. Note that 7.1 is not affected.
Remediation/Fixes
| IBM Spectrum Protect Operations Center Release |
First Fixing VRM Level |
APAR | Platform | Link to Fix |
| 8.1 | 8.1.8 | IT30213 | AIX Linux Windows |
Workarounds and Mitigations
IBM Spectrum Protect Operations Center 8.1.3 through 8.1.7, can add the following statements to the java security file (/opt/tivoli/tsm/jre/lib/security/java.security) to eliminate exposure to this vulnerability:
jdk.certpath.disabledAlgorithms=MD2,MD5,SHA1 usage TLSServer TLSClient SignedJAR, RSA keySize < 1024, DSA keySize < 1024, EC keySize < 256, DSS
jdk.tls.rejectClientInitiatedRenegotiation=true
jdk.certpath.disabledAlgorithms=MD2,MD5,SHA1 usage TLSServer TLSClient SignedJAR, RSA keySize < 1024, DSA keySize < 1024, EC keySize < 256, DSS
jdk.tls.disabledAlgorithms=SSLv3, TLSv1, TLSv1.1, DH keySize < 2048, EC keySize < 256, DSS, 3DES_EDE_CBC, DES, DESede, RC4, MD5, SHA1, TLS_RSA_WITH_AES_128_CBC_SHA, TLS_RSA_WITH_AES_128_CBC_SHA256, TLS_RSA_WITH_AES_256_CBC_SHA, TLS_RSA_WITH_AES_256_CBC_SHA256, TLS_RSA_WITH_AES_128_GCM_SHA256, TLS_RSA_WITH_AES_256_GCM_SHA384, anon, NULL, GCM
jdk.tls.ephemeralDHKeySize=2048
jdk.tls.rejectClientInitiatedRenegotiation=true
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References
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Change History
10 September 2019 - 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.
Internal Use Only
Advisory 17913 Product Record 144079
Document Location
Worldwide
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Document Information
Modified date:
10 September 2019
UID
ibm11073000