Security Bulletin: Spectrum Protect Operations Center vulnerable to Logjam (CVE-2015-4000)

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&gt; 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 |

<https://www.ibm.com/support/docview.wss?uid=ibm10888465&gt;

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.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