==================================================================== CERT-Renater Note d'Information No. 2020/VULN697 _____________________________________________________________________ DATE : 17/12/2020 HARDWARE PLATFORM(S): / OPERATING SYSTEM(S): Systems running Citrix Hypervisor versions up to and including Citrix Hypervisor 8.2 LTSR. ===================================================================== https://support.citrix.com/article/CTX286756 _____________________________________________________________________ CTX286756 Citrix Hypervisor Security Update Security Bulletin | High | 1 found this helpful | Created: 15 Dec 2020 | Modified: 15 Dec 2020 Applicable Products Citrix Hypervisor XenServer Description of Problem Several security issues have been identified that, collectively, may allow privileged code running in a guest VM to compromise the host or cause a denial of service. These vulnerabilities have the following identifiers: CVE ID Description Vulnerability Type Pre-conditions CVE-2020-29479 An attacker with the ability to execute privileged mode code in a guest can compromise the host CWE-707: Improper Neutralization Administrator access in guest CVE-2020-29480 An attacker with the ability to execute privileged mode code in a guest can read non-sensitive metadata about another guest CWE-284: Improper Access Control Administrator access in guest CVE-2020-29481 An attacker with the ability to execute privileged mode code in a guest can read data previously shared, using the Xenstore API, between two other guests CWE-664: Improper Control of a Resource Through its Lifetime Administrator access in guest CVE-2020-29482 An attacker with the ability to execute privileged mode code in a guest can perform a denial of service attack against the host CWE-664: Improper Control of a Resource Through its Lifetime Administrator access in guest CVE-2020-29485 An attacker with the ability to execute privileged mode code in a guest can perform a denial of service attack against the host CWE-664: Improper Control of a Resource Through its Lifetime Administrator access in guest CVE-2020-29486 An attacker with the ability to execute privileged mode code in a guest can perform a denial of service attack against the host or a selected other VM CWE-664: Improper Control of a Resource Through its Lifetime Administrator access in guest CVE-2020-29487 An attacker with the ability to execute privileged mode code in a guest can perform a denial of service attack against the host CWE-664: Improper Control of a Resource Through its Lifetime Administrator access in guest CVE-2020-29568 An attacker with the ability to execute privileged mode code in a guest can perform a denial of service attack against the host CWE-664: Improper Control of a Resource Through its Lifetime Administrator access in guest CVE-2020-29569 An attacker with the ability to execute privileged mode code in a guest can perform a denial of service attack against the host CWE-664: Improper Control of a Resource Through its Lifetime Administrator access in guest CVE-2020-29570 An attacker with the ability to execute privileged mode code in a guest can perform a denial of service attack against the host CWE-664: Improper Control of a Resource Through its Lifetime Administrator access in guest These issues affect all currently supported versions of Citrix Hypervisor up to and including Citrix Hypervisor 8.2 LTSR. What Customers Should Do Citrix has released hotfixes to address these issues. Citrix recommends that affected customers install these hotfixes as soon as practicable. The hotfixes can be downloaded from the following locations: Citrix Hypervisor 8.2 LTSR: CTX286796 – https://support.citrix.com/article/CTX286796 and CTX286800 – https://support.citrix.com/article/CTX286800 and CTX286804 – https://support.citrix.com/article/CTX286804 Citrix Hypervisor 8.1: CTX286795 – https://support.citrix.com/article/CTX286795 and CTX286799 – https://support.citrix.com/article/CTX286799 and CTX286803 – https://support.citrix.com/article/CTX286803 Citrix XenServer 7.1 LTSR CU2: CTX286794 – https://support.citrix.com/article/CTX286794 and CTX286798 – https://support.citrix.com/article/CTX286798 and CTX286802 – https://support.citrix.com/article/CTX286802 Citrix XenServer 7.0: CTX286793 – https://support.citrix.com/article/CTX286793 and CTX286797 – https://support.citrix.com/article/CTX286797 and CTX286801 – https://support.citrix.com/article/CTX286801 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 http://www.citrix.com/site/ss/supportContacts.asp. Reporting Security Vulnerabilities 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. Changelog Date Change 2020-12-15 Initial Publication ========================================================= + CERT-RENATER | tel : 01-53-94-20-44 + + 23/25 Rue Daviel | fax : 01-53-94-20-41 + + 75013 Paris | email:cert@support.renater.fr + =========================================================