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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2018.1784 Citrix XenServer Security Update for CVE-2018-3665 18 June 2018 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Citrix XenServer Publisher: Citrix Operating System: Citrix XenServer Impact/Access: Access Privileged Data -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2018-3665 Reference: ESB-2018.1770 Original Bulletin: https://support.citrix.com/article/CTX235745 - --------------------------BEGIN INCLUDED TEXT-------------------- CTX235745 Citrix XenServer Security Update for CVE-2018-3665 Security Bulletin | High | Created: 15 Jun 2018 | Modified: 15 Jun 2018 Applicable Products o XenServer 7.0 o XenServer 7.1 LTSR Cumulative Update 1 o XenServer 7.3 o XenServer 7.4 o XenServer 7.5 Description of Problem An issue has been identified in certain CPUs that may allow code running in a guest VM to read data from another process in the same VM or another VM running on the same host. The data that can be read is limited to specific CPU registers rather than memory or disk storage; however, those registers may contain sensitive information. This issue affects all currently supported versions of Citrix XenServer up to and including Citrix XenServer 7.5. The following issue has been addressed: o CVE-2018-3665: Speculative register leakage from lazy FPU context switching Mitigating Factors Customers with AMD-based CPUs are believed to be unaffected by this issue. What Customers Should Do Hotfixes have been released to mitigate these issues. Citrix recommends that affected customers install these hotfixes. The hotfixes can be downloaded from the following locations: Citrix XenServer 7.5: CTX235135 - https://support.citrix.com/article/CTX235135 Citrix XenServer 7.4: CTX235175 - https://support.citrix.com/article/CTX235175 Citrix XenServer 7.3: CTX235956 - https://support.citrix.com/article/CTX235956 Citrix XenServer 7.1 LTSR CU1: CTX235957 - https://support.citrix.com/article/ CTX235957 Citrix XenServer 7.0: CTX235958 - https://support.citrix.com/article/CTX235958 Citrix recommends that customers follow the guidance of their operating system vendors for updates to the operating systems of their guest VMs. 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 - --------------------------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 iQIVAwUBWydGnGaOgq3Tt24GAQhiDhAA3c6SX0vDogFRLiS7fmogJtFahW3eu180 XWEuBEyp9QmX3ZqU7WaHgfv2F6ERVmrraNxWwZzB0R/NLY0/6/jm85DSiAYz8n2i q6O2+uuWzzfD2/QqkyQVB6nqMqJzrib7AsJkMsQKQPS8m67ML7lkmoGlAwkKZXnK vHZKNTHN8Da1O3fRPYKGpI95FGvmahFfuuWMhfT3LOXAMKbjGYr0rs4lMq1Lm/So 3UwoTRbiq6huC9GDhO+PZjhZuHxZKGiG3fwfdPsul6Y9+1/FDnEIlSDLqJB3TLzo YfwWVGM/XyE3Ag9Ko9bcknGovj9PTdwrfA7OLhXEnhTSKV4Yd5VaPoEzqlvUpDpH 7ZNe3bzAgnVYcK9onsPWly3Lg2mLxiVmujCHnKTemRoDPE21ZQign26JGXiQJ6dI ie3b8SHXDwbdwk85o8J38nJb2WPHUmP73RQ/VTgy1c0MJ4mqM2VH0NAXIv6oJvP2 XNbAcqpElEYkxQ8j6QIyBA8I4inmDSe5tBUsmRj66fgR9LJ4s1WYGEWeufxa/OKA 7HLXRPBj++lP1LI+XXzC9r5eA2g0ztA1bVJLBsyUV0mluU4mDrQMqEFYYTBg/zz7 qefW6yqe0xbNjHGu6f9IKfuXYxHVdK6MbjBEu+a3Bf3G2wwa/qw0DvCx01ojV/OQ Zzm5h0EoPGQ= =o/DH -----END PGP SIGNATURE-----