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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2017.2585 Citrix XenServer Multiple Security Updates 13 October 2017 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: XenServer Publisher: Citrix Operating System: Windows Network Appliance Impact/Access: Root Compromise -- Existing Account Resolution: Patch/Upgrade Original Bulletin: http://support.citrix.com/article/CTX228867 - --------------------------BEGIN INCLUDED TEXT-------------------- CTX228867 Citrix XenServer Multiple Security Updates Security Bulletin | High | Created: 12 Oct 2017 | Modified: 12 Oct 2017 Applicable Products XenServer 7.2XenServer 7.1 LTSR Cumulative Update 1XenServer 7.1XenServer 7.0XenServer 6.5XenServer 6.2.0XenServer 6.0.2 Description of Problem A number of security vulnerabilities have been identified in Citrix XenServer that may allow a malicious administrator of a guest VM to compromise the host. These vulnerabilities affect all currently supported versions of Citrix XenServer up to and including Citrix XenServer 7.2. The following vulnerabilities have been addressed: CVE-2017-TBA0: Unlimited recursion in linear pagetable de-typing CVE-2017-TBA1: Stale TLB entry due to page type release race CVE-2017-TBA2: page type reference leak on x86 CVE-2017-TBA3: x86: Incorrect handling of self-linear shadow mappings with translated guests CVE-2017-TBA4: x86: Incorrect handling of IST settings during CPU hotplug CVE-2017-TBA7: multiple MSI mapping issues on x86 CVE-2017-TBA9: hypervisor stack leak in x86 I/O intercept code For customers that do not have PV-based guests, are not using PCI passthrough and are using hardware with HAP support, the risk is reduced to a disclosure of a small part of the hypervisor stack. What Customers Should Do Hotfixes have been released to address these issues. Citrix strongly recommends that affected customers install these hotfixes as soon as possible. The hotfixes can be downloaded from the following locations: Citrix XenServer 7.2: CTX228722 https://support.citrix.com/article/CTX228722 Citrix XenServer 7.1 LTSR CU1: CTX228721 https://support.citrix.com/article/CTX228721 Citrix XenServer 7.1 LTSR: CTX228720 https://support.citrix.com/article/CTX228720 Citrix XenServer 7.0: CTX228719 https://support.citrix.com/article/CTX228719 Citrix XenServer 6.5 SP1: CTX228718 https://support.citrix.com/article/CTX228718 Citrix XenServer 6.2 SP1: CTX228717 https://support.citrix.com/article/CTX228717 Citrix XenServer 6.0.2 Common Criteria: CTX228716 https://support.citrix.com/article/CTX228716 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 12th October 2017 Initial publishing - --------------------------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 iQIVAwUBWeAOpox+lLeg9Ub1AQjpYhAAhv+7moD/1znQwoJQVW+EPb5s7svHsCRD VfbeMOiflrKz3aIjAO1EtgSblQq4KThJg0cPZC9+CJ0osxdwdXW5jBCFYnyCa4T8 s1QXg4Oy2GHH3gsed2/yD/uA3IXhTGERY3oEYGEZ5ZXquVeaCs8XJR7am4eSQ0F5 kBurZPVQmGoHnRMc4HL25lmqnI0pi0KaJBiC2Cr37/owPiObMDvC5XW8XY+nxQ+P Ku62pOlXSc0A3iSqDOpCYVpYbheqbYbddVJkiSx20+qPGcf6qIu1ceszgLBIdJea hMobSGJooCjsQHTSKheVXb/lndwYtZ5TusxKDT0kGY2A9sUry8q6T3CEPgRVeNxw lCA2Yx+WbvrzSx35/MOvjWJPufMyZx8WFHaD8NttcVQ+UXm+AHQ5fwJDIf8BnfdH cF6baE3v3BugEOBYGhvBbORf5cS7tP7ghWgTUk81Fj1oJT01HOYaTm0PEUhMY3pG BoeqZwTWlpKQtNa5e0WT9KDX7dmLxl4I72XmbRJPmD0pKg8qg5x2v54OFU3fqzkk p1GEHvfOTLhn5e5IQjU0oCNd+MJF8Roiv/ma01NJwf9sciDW9FRieLljma2VFQET h4f0j7hBlY1iB83LMNlA8Lnf1EJlHtapZ2EglzxKxIM03arfP6qlXUXNrCFWBLzY 3PP69N+BOgM= =dfH0 -----END PGP SIGNATURE-----