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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2018.1604 Citrix patches speculative execution variant 4a in XenServer 28 May 2018 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Citrix XenServer Publisher: Citrix Operating System: Windows Virtualisation Impact/Access: Access Privileged Data -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2018-3639 Original Bulletin: https://support.citrix.com/article/CTX235225 - --------------------------BEGIN INCLUDED TEXT-------------------- CTX235225 Citrix XenServer Security Update for CVE-2018-3639 Security Bulletin | Created: 22 May 2018 | Modified: 22 May 2018 Applicable Products * XenServer 7.4 * XenServer 7.3 * XenServer 7.1 LTSR Cumulative Update 1 * XenServer 7.0 Description of Problem CVE-2018-3639 Speculative Store Bypass Disable is an issue that may affect third-party software that runs in guest VMs on Citrix XenServer. This is not an issue caused by Citrix XenServer and Citrix is unaware of any means of exploiting this issue against XenServer itself. Third-party software can mitigate this issue by restructuring of the code; for Intel CPUs, third-party software may instead choose to mitigate this issue by selectively enabling and disabling a CPU feature known as memory disambiguation. This requires both new host firmware and the new functionality of that firmware to be exposed to guest VMs. To expose this firmware functionality, Citrix is releasing hotfixes for supported versions of Citrix XenServer 7.x. - ------------------------------------------------------------------------------- What Customers Should Do Customers wishing to expose the new host firmware functionality to their guest VMs should install both the Citrix XenServer hotfixes and updated host firmware or BIOS code. The locations of the Citrix XenServer hotfixes are listed below; Citrix recommends following your hardware supplier's guidance for firmware updates. Citrix XenServer 7.4: CTX235133 - https://support.citrix.com/article/CTX235133 Citrix XenServer 7.3: CTX235132 - https://support.citrix.com/article/CTX235132 Citrix XenServer 7.1 LTSR CU1: CTX235131 - https://support.citrix.com/article/ CTX235131 Citrix XenServer 7.0: CTX235130 - https://support.citrix.com/article/CTX235130 Note that, in line with previous issues that were not vulnerabilities in Citrix XenServer, mitigations are not available for versions 6.x of Citrix XenServer. - ------------------------------------------------------------------------------- What Citrix Is Doing Citrix is notifying customers and channel partners about this potential security issue. This article is also available from the Citrix Knowledge Center at http://support.citrix.com/. - ------------------------------------------------------------------------------- Obtaining Support on This Issue If you require technical assistance with this issue, please contact Citrix Technical Support. Contact details for Citrix Technical Support are available at https://www.citrix.com/support/open-a-support-case.html. - ------------------------------------------------------------------------------- Reporting Security Vulnerabilities Citrix welcomes input regarding the security of its products and considers any and all potential vulnerabilities seriously. For guidance on how to report security-related issues to Citrix, please see the following document: CTX081743 - - Reporting Security Issues to Citrix - ------------------------------------------------------------------------------- Changelog +-----------------------------------------------------------------------------+ |Date |Change | |-------------------------------+---------------------------------------------| |22nd May 2018 |Initial Publication | +-----------------------------------------------------------------------------+ - --------------------------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. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. 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: https://www.auscert.org.au/bulletins/ =========================================================================== 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). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBWwtS/2aOgq3Tt24GAQhbUxAAo4abJLb3zvjVA3glT7F85ZAWYqGbByGN Dk51qy6H3U/3/mG1anXCqQCSKontIFb/A1tN/86FbZlRhjVoX8pBanvHGXEgY2uS Azs7m1mUQQ1gEa3MJ08/p/l6zeJQrVqGxbv3pVTLrEeX7PeLHW1s5A2QRzssE9Ud m9QNsiaMC68SHXpkRjJfS65E4CRu/mVWn09fnNtq+YL/nl+KbGjrHCw4QBU4xOws rFfd7Hsc/mv7YGs8N4CBMq3MReo8VK8RwVbDvBSylhmd9SZHfMNuE0ULNxVfOwJ3 JwaRp5o8DcgQrcV5Td2cuCDNjZq9a5GDu+KmZGLNFnoPgO18OdGvo5+v3r4mgUg1 abO7jNSuLUIao32zoyVGuiipYXF6c4cdaR/5E2T1Um+S+zFtUgy61//TrQDE/Wxn viXokbAQfr7w6NVhP7xpmmfPCECq7CNPhaf9Fgn7DPQJR9v4KWH0mCE2HIW5Otsv yu93reAUSEC4vZ8DllYMCG09MOKQ6nHAgGoOjGDQK/V8Qa2kPQtYnim6pINXad9F pk2qAp6CuxS4VNvq8M4c5naxTPVQF3vI/9AamxiahQoWI2kZX3uViqGs7E3BHU4f DB1eH/ncnr2MyIaT1Gcyw1gsagjf+Rr5Yoqc7fijzspMMBjS1J1zRZSLPQ2T0zOJ a/plCLIlMWY= =myFC -----END PGP SIGNATURE-----