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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2016.1230 Security Bulletin: "SLOTH" vulnerability in IBM Java SDK affects InfoSphere Streams (CVE-2015-7575) 17 May 2016 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: IBM Streams Publisher: IBM Operating System: Linux variants Impact/Access: Access Privileged Data -- Remote with User Interaction Provide Misleading Information -- Remote with User Interaction Resolution: Patch/Upgrade CVE Names: CVE-2015-7575 Reference: ASB-2016.0004 ESB-2016.1104 ESB-2016.1097 ESB-2016.0949 ESB-2016.0055 ESB-2016.0049 ESB-2016.0047 ESB-2016.0046 Original Bulletin: http://www.ibm.com/support/docview.wss?uid=swg21977838 - --------------------------BEGIN INCLUDED TEXT-------------------- Security Bulletin: "SLOTH" vulnerability in IBM Java SDK affects InfoSphere Streams (CVE-2015-7575) Document information More support for: IBM Streams Software version: 1.2, 2.0, 3.0, 3.1, 3.2, 3.2.1, 4.0, 4.0.1, 4.1 Operating system(s): Linux Software edition: All Editions Reference #: 1977838 Modified date: 2016-05-16 Security Bulletin Summary There is a vulnerability in IBM SDK Java Technology Edition, Versions 7R1 Service Refresh 3 Fix Pack 1 and earlier releases and Version 8 Service Refresh 1 Fix Pack 1 and earlier releases that is used by IBM InfoSphere Streams. This vulnerability, commonly referred to as SLOTH, was disclosed as part of the IBM Java SDK updates in January 2016. Vulnerability Details CVEID: CVE-2015-7575 DESCRIPTION: The TLS protocol could allow weaker than expected security caused by a collision attack when using the MD5 hash function for signing a ServerKeyExchange message during a TLS handshake. An attacker could exploit this vulnerability using man-in-the-middle techniques to impersonate a TLS server and obtain credentials. This vulnerability is commonly referred to as SLOTH. CVSS Base Score: 7.1 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/109415 for the current score CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/UI:U/C:H/I:L/A:N) Affected Products and Versions 1.2.1.0 2.0.0.4 and earlier 3.0.0.5 and earlier 3.1.0.7 and earlier 3.2.1.4 and earlier 4.0.1.1 and earlier 4.1 Remediation/Fixes Java technology is used for SSL/TLS in InfoSphere Streams. The "SLOTH" vulnerability in Streams can be corrected by applying the appropriate remediation or upgrade documented below. NOTE: Fix Packs are available on IBM Fix Central. Version 4.1. Take one of the following actions: Perform the mitigation steps for Java referenced in the Workarounds and Mitigations section below. Upgrade to InfoSphere Streams Mod Release 4.1.1 (available on Passport Advantage). Version 4.0.1: Take one of the following actions: Perform the mitigation steps for Java referenced in the Workarounds and Mitigations section below. Apply 4.0.1 Fix Pack 2 (4.0.1.2) or higher. Version 3.2.1: Take one of the following actions: Perform the mitigation steps for Java referenced in the Workarounds and Mitigations section below. Apply 3.2.1 Fix Pack 5 (3.2.1.5) or higher. Version 3.1.0: Apply 3.1.0 Fix Pack 8 (3.1.0.8) or higher. If JAVA_HOME is defined see the note at the end of this section. Version 3.0.0: Apply 3.0 Fix Pack 6 (3.0.0.6) or higher. If JAVA_HOME is defined see the note at the end of this section. Versions 1.2 and 2.0: For version 1.x and 2.x IBM recommends upgrading to a fixed, supported version/release/platform of the product. Customers who cannot upgrade and need to secure their installation should open a PMR with IBM Technical Support and request assistance securing their InfoSphere Streams system against the vulnerabilities identified in this Security Bulletin. IMPORTANT NOTE: If JAVA_HOME is set ensure it points to the install location of the upgraded IBM Developer Kit, Java. Applications compiled with JAVA_HOME set to a different location will need to be recompiled after JAVA_HOME has been changed. For more information on compiling with JAVA_HOME set see the Notes section on the page at this URL: http://www-01.ibm.com/support/knowledgecenter/SSCRJU_4.0.0/com.ibm.streams.install.doc/doc/ibminfospherestreams-install-prerequisites-java-supported-sdks.html?lang=en Workarounds and Mitigations Customers using Streams versions 3.2.1, 4.0.1, or 4.1 should disable the use of the MD5 hash by editing the java.security file and adding or updating the entry for the jdk.certpath.disabledAlgorithms property with "MD5" and adding or updating the entry for the jdk.tls.disabledAlgorithms property with "MD5withRSA". If the documented mitigation for the "SLOTH" vulnerability has previously been applied, the java.security file will have entries similar to: jdk.certpath.disabledAlgorithms=MD2, RSA keySize < 1024, MD5 jdk.tls.disabledAlgorithms=SSLv3, RC4, DH keySize < 768, MD5withRSA The java.security file is located in <STREAMS_INSTALL>/java/jre/lib/security. Be certain that the line is not commented (does not begin with the "#" symbol). Restart all domains and instances for this change to take effect. You should verify applying this configuration change does not cause any compatibility issues. Not disabling the MD5 signature hash 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 MD5 signature hash and take appropriate mitigation and remediation actions. Get Notified about Future Security Bulletins Subscribe to My Notifications to be notified of important product support alerts like this. References Complete CVSS v3 Guide On-line Calculator v3 Related information IBM Secure Engineering Web Portal IBM Product Security Incident Response Blog Change History 11 March 2016: 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 According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES "AS IS" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY. - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. 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It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/render.html?cid=1980 =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). 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