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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2016.0542 Security Bulletin: A vulnerability in IBM Java SDK affects IBM OS Images for Red Hat Linux Systems, AIX, and Windows. (CVE-2015-7575) 1 March 2016 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: IBM OS Images Publisher: IBM Operating System: AIX Red Hat Windows 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-2016.0539 ESB-2016.0538 ESB-2016.0523 ESB-2016.0522 ESB-2016.0521 ESB-2016.0519 ESB-2016.0518 Original Bulletin: http://www.ibm.com/support/docview.wss?uid=swg21977880 - --------------------------BEGIN INCLUDED TEXT-------------------- Security Bulletin: A vulnerability in IBM Java SDK affects IBM OS Images for Red Hat Linux Systems, AIX, and Windows. (CVE-2015-7575) Document information More support for: PureApplication System Software version: 2.0, 2.0.0.1, 2.1.0.0, 2.1.0.1, 2.1.0.2, 2.1.1.0, 2.1.2.0 Operating system(s): AIX, Linux, Windows Reference #: 1977880 Modified date: 2016-02-29 Security Bulletin Summary There is a vulnerability in IBM SDK Java Technology Edition, Version 6 and 7, that is used by IBM OS Images for Red Hat Linux Systems, IBM OS Images for AIX, and Windows. The issue was disclosed as part of the IBM Java SDK updates in January 2016 and this vulnerability is commonly referred to as SLOTH. 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 IBM OS Image for Red Hat Linux Systems 3.0.0.0 and earlier. IBM OS Image for AIX Systems 2.1.1.0 and earlier. Remediation/Fixes Virtual machines deployed from IBM PureApplication Systems are affected. This includes RedHat Linux, AIX-based, and Windows-based deployments. The solution is to apply the following IBM PureApplication System fix to the deployed virtual machines. Java Update for Windows http://www-933.ibm.com/support/fixcentral/swg/doSelectFixes?options.selectedFixes=Java_Update_Windows_Feb_2016 Java Update for Linux http://www-933.ibm.com/support/fixcentral/swg/doSelectFixes?options.selectedFixes=Java_Update_Linux_Feb_2016 Java Update for AIX http://www-933.ibm.com/support/fixcentral/swg/doSelectFixes?options.selectedFixes=Java_Update_AIX_Feb_2016 1. Import the fix into the Emergency Fix catalogue. 2. For deployed instances, apply this emergency fix on the VM. 3. Restart the deployed instance after the fix is applied. Workarounds and Mitigations For CVE-2015-7575: Users of Java 7 and later can address the issue by updating the /jre/lib/security/java.security file as follows (both steps are required): Add MD5 to the jdk.certpath.disabledAlgorithms property - e.g. jdk.certpath.disabledAlgorithms=MD2, RSA keySize < 1024, MD5 Add MD5withRSA to the jdk.tls.disabledAlgorithms property - e.g. jdk.tls.disabledAlgorithms=SSLv3, RC4, DH keySize < 768, MD5withRSA Java 6 requires code changes in the JSSE component in addition to the java.security file modifications, so upgrading the JDK is the only solution. 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 Acknowledgement CVE-2015-7575 was reported to IBM by Karthikeyan Bhargavan at INRIA in Paris, France Change History 26 February 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. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. 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