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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2020.4174.2 Citrix Hypervisor Security Update 21 January 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Citrix Hypervisor XenServer Publisher: Citrix Operating System: Network Appliance Impact/Access: Execute Arbitrary Code/Commands -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2020-29040 Original Bulletin: https://support.citrix.com/article/CTX286511 Revision History: January 21 2021: Vendor updated with CVE ID November 25 2020: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- Citrix Hypervisor Security Update Reference: CTX286511 Category : Medium Created : 24 November 2020 Modified : 20 January 2021 Applicable Products o Citrix Hypervisor o XenServer Description of Problem A security issue has been identified that may allow privileged code running in a guest VM to compromise the host. This issue is limited to only those guest VMs where the host administrator has explicitly assigned a PCI passthrough device to the guest VM. The issue has the following identifier: CVE ID Description Vulnerability Pre-conditions Type CVE-2020-29040 Bounding error CWE-121 A PCI passthrough device updating physmap must be assigned This issue affects all currently supported versions of Citrix Hypervisor up to and including Citrix Hypervisor 8.2 LTSR. Mitigating Factors Customers who are not using the PCI passthrough feature of Citrix Hypervisor are not at risk from this issue What Customers Should Do Citrix has released hotfixes to address this issue. Citrix recommends that affected customers install these hotfixes as their patching schedule allows. The hotfixes can be downloaded from the following locations: Citrix Hypervisor 8.2 LTSR: CTX286459 - https://support.citrix.com/article/ CTX286459 Citrix Hypervisor 8.1: CTX286458 - https://support.citrix.com/article/CTX286458 Citrix XenServer 7.1 LTSR CU2: CTX286457 - https://support.citrix.com/article/ CTX286457 Citrix XenServer 7.0: CTX286456 - https://support.citrix.com/article/CTX286456 Changelog Date Change 2020-11-24 Initial Publication 2021-01-20 CVE ID Added - --------------------------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 iQIVAwUBYAkAA+NLKJtyKPYoAQgbtQ//Tkd8n0YuT04275YEo13INk/eoJUK7OQk UQl31PsBFz8PC47SiFu47ciHOASRFp4Q/o2Sqmt+H6r+WmgTkLzj2EdrEGXQAVGl barj0yK6H52oLtorbSn4UTLAr+eKZBS/l1v3/wd70kBro9T1M1wEstVzQcYX6xMq IhQSNnZT3loAnm+H3RlOUI3yMfuoBF1wj2RUP2gcQ1A2VS7SiygszIPb8gp+PV/Q 0Tx6yby9tityMeAWJH8dtFUCb70QFKye6yvfMrSgeCsXJtudNWDb9yDbictbUTy5 dGT1NViYIRNLEJ75GQOfjH8hjYVYl9ZszTcYOqTxXmJwUij65GUdyJ/okWuPEF/H j939qVRH1FHoYXfCQZjqcIewSfWWCEQ4obq7nzBVF3uBwbP7c69iebwz9FaVKB5o EucRWrSLl796hEFYXTPXTCdITix8hsXXH6qNne/merfAoAA94oBFanGJE7wfUnMw 3QwtYDCCD/gudHsy0P3XCGboVJHjE3ZosvPWmdQP8+OJwc0C3tB8EQ1j3aPUZ2nX CroSDYZN31wWtxRq1D3/bQnTW8g4E3wQt25qvWdZVS1e9MsJWxxM+9SuRgdZOSMd 8snTs0olUczRLyte7Kkz/OWVrcrtt2rDopZZsv8SEpSsf0Uk4r6rZAQw969GHRkB NQDeW7hH4pQ= =3m4i -----END PGP SIGNATURE-----