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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2016.0152 Vulnerability in MD5 Signature and Hash Algorithm affects IBM Sterling Connect:Direct for UNIX 21 January 2016 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: IBM Sterling Connect Publisher: IBM Operating System: AIX HP-UX Linux variants Solaris Impact/Access: Access Privileged Data -- Remote/Unauthenticated Provide Misleading Information -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2015-7575 Reference: ASB-2016.0004 Original Bulletin: http://www-01.ibm.com/support/docview.wss?uid=swg21974888 - --------------------------BEGIN INCLUDED TEXT-------------------- Security Bulletin: Vulnerability in MD5 Signature and Hash Algorithm affects IBM Sterling Connect:Direct for UNIX (CVE-2015-7575) Security Bulletin Document information More support for: Sterling Connect:Direct for UNIX Software version: 4.0, 4.1 Operating system(s): AIX, HP-UX, Linux, Solaris Reference #: 1974888 Modified date: 2016-01-19 Summary The MD5 SLOTH vulnerability on TLS 1.2 affects IBM Sterling Connect:Direct for UNIX. 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. 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/S:U/C:H/I:L/A:N) Affected Products and Versions IBM Sterling Connect:Direct for Unix 4.1.0 IBM Sterling Connect:Direct for Unix 4.0.0 Remediation/Fixes V.R.M.F APAR Remediation/First Fix 4.1.0 IT02558 Apply 4.1.0.4 iFix 027 or later, available on Fix Central 4.0.0 IT02558 Apply 4.0.00 Fix 114 or later, available on IWM For older versions/releases IBM recommends upgrading to a fixed, supported version/release of the product. Workarounds and Mitigations For each record listed in the C:D Secure+ Admin Tool, go to its TLS/SSL Protocol > TLS/SSL Options tab and remove any cipher suites listed as Enabled that use MD5 signatures. 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. 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 Complete CVSS v3 Guide On-line Calculator v3 Related information IBM Secure Engineering Web Portal IBM Product Security Incident Response Blog Acknowledgement Reported to IBM by Karthikeyan Bhargavan at INRIA in Paris, France Change History 19 January 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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On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBVqBm9X6ZAP0PgtI9AQI40w/8Dn4sZXLDit/KFzkreVXPn8xFf/iUujV4 UBo+ShXNS7BHSS8OQzfui+w98uFacdnP1N1vzsPYW/ROyp0ZAdvP0bIydmGFtJl5 kHg945jJpcQ0nL26IBOjF/UQYvMGPnLIv9Ga5HNTxN67s8yQW9lSeP49T8Lqse7b oFfC75ReHN+hjPvU8uCgpF98m5h/rYQ8242wXLtBoBlU9j6KCm3b5FkQ24S6yVwr NbPtcbkdjK+z0KR6q7YGumchecrZHLjd6dPQYYraA/amTY2oBYB3ugw1Aj6e8jji iWEu/95O/hgREIRJIj1CL4FGUPRof89kB8LAvSnTo0TwBNSh6qGXD0wtHG86YKxh D+PvcQggVOOPUgjkFXcRlhzvcAWeYDI/1dOGUShDEV3oyK2l4FUfmaMveTpPbjVl W9xetx2Q4Z7XGSrPXUw/IXuJhQu1Efskp1UXKctpkXuyUSE67YyWRqT3TKmEUxL3 flbk+0FdC8QxIrU9JAVx+Hc72RAH0Hupf0cS4pOcqaItPQpE1D4Ne19stYYA3kXf 1jBmeDmIAY2+WViWI5tFZS7prmJGwDoTC9uS5e0MCXJShAx/pif+VsOrvwXKqsW3 CStlK0vasB6MoUzCyRm9sKV/YWW8nwpiOAHHy8R+zPbrowoqu10lMWH3NerS2qZh +bT8vh+4CKE= =TDYz -----END PGP SIGNATURE-----