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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.4707 Citrix Hypervisor Security Update 18 December 2019 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Citrix Hypervisor 8.0 Publisher: Citrix Operating System: Virtualisation Impact/Access: Increased Privileges -- Existing Account Denial of Service -- Existing Account Access Confidential Data -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2019-19583 CVE-2019-19580 CVE-2019-19577 CVE-2019-14607 Reference: ESB-2019.4656 ESB-2019.4651.2 Original Bulletin: https://support.citrix.com/article/CTX266932 - --------------------------BEGIN INCLUDED TEXT-------------------- Citrix Hypervisor Security Update Reference: CTX266932 Category : High Created : 11 Dec 2019 Modified : 11 Dec 2019 Applicable Products o Citrix Hypervisor 8.0 o XenServer 7.6 o XenServer 7.1 LTSR Cumulative Update 2 o XenServer 7.0 Description of Problem A number of vulnerabilities have been found in Citrix Hypervisor (formerly Citrix XenServer) that may: i. Allow the host to be compromised by privileged code in a PV guest VM, ii. allow unprivileged code in a HVM guest VM to cause that guest to crash and iii. under certain conditions, allow an HVM guest VM to cause the host to eventually run out of memory. These issues have the following identifiers: o CVE-2019-19580 o CVE-2019-19583 o CVE-2019-19577 In addition, this hotfix contains updated microcode that addresses an issue in specific Intel CPU hardware that may allow malicious unprivileged code within a guest VM to compromise that guest VM. This issue has the following identifier: o CVE-2019-14607 These issues affect all currently supported versions of Citrix Hypervisor up to and including Citrix Hypervisor 8.0. Mitigating Factors Customers running only HVM workloads are not affected by the host compromise issue. Customers who are not running on AMD hardware, or who do not use PCI Passthrough functionality, are not affected by the memory exhaustion issue. Not all Intel CPUs are affected by the Intel CPU hardware issue. Details of which CPUs are affected can be found at: https://www.intel.com/content/www/us/ en/security-center/advisory/intel-sa-00317.html . What Customers Should Do Hotfixes have been released to address these issues. Citrix recommends that affected customers install these hotfixes as their patching schedules allow. The hotfixes can be downloaded from the following locations: Citrix Hypervisor 8.0: CTX263620 - https://support.citrix.com/article/CTX263620 Citrix XenServer 7.6: CTX263619 - https://support.citrix.com/article/CTX263619 Citrix XenServer 7.1 LTSR CU2: CTX263618 - https://support.citrix.com/article/ CTX263618 Citrix XenServer 7.0: CTX263617 - https://support.citrix.com/article/CTX263617 Changelog +-------------------------------------+---------------------------------------+ |Date |Change | +-------------------------------------+---------------------------------------+ |11th December 2019 |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 iQIVAwUBXfmR3maOgq3Tt24GAQgkhxAAiTOT4zY7k8AtdDoL+Gf7kYLZh8xShqCw eyFp7gFBmyJuP76qoFBOPuf/Z1+SEocRIC9LibpJvi1N1iLPP/rONigCr/h2Q/xv dpSFK//0elWnmGaLRmwsSRYh7ciepCYYOZH/05WtEv06Mmdae4K6/++Jh/q+34g6 rTqV01qXI/ZZRSh7IgUgGZCWks6atR//l3MxxE8bMGKPHKG7lIeDD1Npmv3XbvBQ SPE9QlECqa3/cvarWi4Hz+a6c91DPXj1/TRb7P2G4KtMSjAqLOdEVPVCFLteszsC wh5s86rPOJ2SVJWYV4QB28XsnSeFBIcMp74ar3+XGpFJ3ydZ/H9OqFSnvXto4I2X n/NLUKFFDJXKY/CV12ljuIT1KXPwQ3/V/QjM6DtIclDnwBXzdfx/430qX+nO0rgA n1/Dp0Jd1dGep+GHjabUbhPivBT8LQRemAewgfT3mBgUkN0N/gb3n/HOhIM0DVoY LNf0WuyrQJeROglX63Z+vBGA4w+jwSbh5mHYZqvOcdM/sFk8cIyHI7+wSchEdw9/ K7r5Xn1iWjK4pZcQPIu4RPTMd87oTCIxROucAH4nAG/659nhXsNHAp3TK3Q0RIq9 J7IfgjGZnJoYPsj9nYg5G48WmywOvE6GPDxx+G91/OWOy4CMrJ6Z6io1KjOT8ThP cemN+ciVn2s= =J1hl -----END PGP SIGNATURE-----