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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2022.3086 Citrix Hypervisor Security Update 24 June 2022 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Citrix Hypervisor Publisher: Citrix Operating System: Virtualisation Resolution: Patch/Upgrade CVE Names: CVE-2022-26362 CVE-2022-21166 CVE-2022-21127 CVE-2022-21125 CVE-2022-21123 Original Bulletin: https://support.citrix.com/article/CTX460064/citrix-hypervisor-security-update Comment: CVSS (Max): 6.4 CVE-2022-26362 (CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H) CVSS Source: [NVD], Red Hat Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H - --------------------------BEGIN INCLUDED TEXT-------------------- Citrix Hypervisor Security Update Reference: CTX460064 Category : Medium Created : 23 June 2022 Modified : 23 June 2022 Description of Problem A security issue has been identified in Citrix Hypervisor 7.1 LTSR CU2 that may allow privileged code in a PV guest VM to compromise the host. Citrix believes that there would be significant complexity in performing this attack in Citrix Hypervisor. This has been rated as a medium severity disclosure; the full text of the public bulletin can be found in Appendix A of this document. The issue has the following CVE identifier: o CVE-2022-26362 In addition Intel has disclosed several issues that affect CPU hardware and may allow code inside a guest VM to access very small sections of memory data that are actively being used elsewhere on the system. Although this is not an issue in the Citrix Hypervisor product itself, Citrix is releasing hotfixes that include product changes to mitigate these CPU issues. These issues have the the following CVE identifiers: o CVE-2022-21123 o CVE-2022-21125 o CVE-2022-21127 o CVE-2022-21166 Customers who are not running PV guest VMs are not affected by the Citrix Hypervisor issue. Customers who are not using Intel CPUs are not affected by the Intel CPU issues. 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 CU1 LTSR: CTX459954- https://support.citrix.com/article/ CTX459954 Citrix XenServer 7.1 CU2 LTSR: CTX459953- https://support.citrix.com/article/ CTX459953 What Citrix is Doing Citrix is notifying customers and channel partners about this potential security issue through the publication of this security bulletin on the Citrix Knowledge Center at https://support.citrix.com/securitybulletins . 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 . Subscribe to Receive Alerts Citrix strongly recommends that all customers subscribe to receive alerts when a Citrix security bulletin is created or modified at https://support.citrix.com /user/alerts . Reporting Security Vulnerabilities to Citrix Citrix welcomes input regarding the security of its products and considers any and all potential vulnerabilities seriously. For details on our vulnerability response process and guidance on how to report security-related issues to Citrix, please see the following webpage: https://www.citrix.com/about/ trust-center/vulnerability-process.html . Disclaimer This document is provided on an "as is" basis and does not imply any kind of guarantee or warranty, including the warranties of merchantability or fitness for a particular use. Your use of the information on the document is at your own risk. Citrix reserves the right to change or update this document at any time. Customers are therefore recommended to always view the latest version of this document directly from the Citrix Knowledge Center. Changelog Date Change 2022-06-23 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: https://auscert.org.au/gpg-key/ iQIVAwUBYrUhc8kNZI30y1K9AQgc3w//ZT5YCp6Ivt1DyD63YIjnxazmqkLPccbh gKGeBrNcOgUAs4XmpllkVbpfpfEYgkDnqjsNm9y5x3nKhS5/yw6+HNPOQmMynjv7 UovqclbPQu31As/inaAGJpZCod13XulPxPxyGfTI/tN3nbLnvLwfhRG71sOXbkiv S8VzaRbvGJqLNAQcHifyoAYmV8E19dLjnkB47wyb67KZ7adKJgqVEQCmzJpnjWaz oJBfS/wuTPmHFVfU0HO1T2RmBME23rbIG3z+veQeTp6dKxAGFdjoKqfYMVFe+kdq FKnM22T6Xvcxb/3Ac9Gvi6agFZ7PsDd0pckoi8GNA3tt5aIjgb9aA8MiDgVEgCLv TnbWDOe0PrYztNJz6BcqvkLRpfw9HPu86AgAk4o+H+eMryFpt2/4rmLdqPukaihp VioQ6XvM5vzPB+TNCSHA5dkCZgk0Sw2bdyWToR4UwTOkQacTBlO2MJPraONZEnjv S0pXJUjTstEwUivRjfGNK/P0bAcffPjXKDyi+KXrH25BxLR3wRlQ9uJjyX/jtJU6 PioC0MFlg2x02L+SYmTZlvi9hwo3e8h/jLoXp5e0Xs7RJqfqvywc/zNJ20cRf53F HjgfzEADhmfZ6gfvI96+tf46NleRt9c0ID2o7m+UWfBVYm36gTDd2O6ytvuaPx7s 1cwdmhs8zjM= =+qee -----END PGP SIGNATURE-----