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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2020.2003 LSN-0068-1: Kernel Live Patch Security Notice 10 June 2020 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: linux kernel Publisher: Ubuntu Operating System: Ubuntu Linux variants Impact/Access: Access Privileged Data -- Existing Account Denial of Service -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2020-12114 CVE-2020-11494 CVE-2020-8649 CVE-2020-8648 CVE-2020-8647 CVE-2020-0543 Reference: ESB-2020.1994 ESB-2020.1812 ESB-2020.1779.3 ESB-2020.1476 ESB-2020.0771 Original Bulletin: https://usn.ubuntu.com/lsn/0068-1/ Comment: This advisory references vulnerabilities in the Linux kernel that also affect distributions other than Ubuntu. It is recommended that administrators running Linux check for an updated version of the kernel for their system. - --------------------------BEGIN INCLUDED TEXT-------------------- LSN-0068-1: Kernel Live Patch Security Notice 9 June 2020 Linux kernel vulnerabilities A security issue affects these releases of Ubuntu and its derivatives: o Ubuntu 20.04 LTS o Ubuntu 18.04 LTS o Ubuntu 16.04 LTS o Ubuntu 14.04 ESM Summary Several security issues were fixed in the kernel. Software Description o linux - Linux kernel o linux-aws - Linux kernel for Amazon Web Services (AWS) systems o linux-oem - Linux kernel for OEM systems Special Notice for CVE-2020-0543 On June 9, Intel announced CVE-2020-0543, a CPU hardware issue known as Special Register Buffer Data Sampling (SRBDS), which could result in data leaks from random number generation instructions. The issue affects a subset of Intel CPUs and is mitigated by a CPU microcode update. This is a hardware issue and cannot be mitigated with a livepatch. The kernel update associated with the CVE provides the ability to turn the mitigation on and off and to report the presence of the mitigation in the microcode, and should be installed with the updated microcode. To determine if your Intel CPU is affected, consult Intel's list of affected processors. Note that AMD processors, and architectures other than x86_64, are not affected by this CVE. Users affected by this issue should update their kernel and CPU microcode, and reboot into the new kernel. Users not affected by CVE-2020-0543 may continue to use livepatch updates without rebooting. For more information about the CVE and our response, please consult the Ubuntu SRBDS wiki page. Details It was discovered that the virtual terminal implementation in the Linux kernel did not properly handle resize events. A local attacker could use this to expose sensitive information. (CVE-2020-8647) It was discovered that the virtual terminal implementation in the Linux kernel contained a race condition. A local attacker could possibly use this to cause a denial of service (system crash) or expose sensitive information. (CVE-2020-8648) It was discovered that the virtual terminal implementation in the Linux kernel did not properly handle resize events. A local attacker could use this to expose sensitive information. (CVE-2020-8649) It was discovered that the Serial CAN interface driver in the Linux kernel did not properly initialize data. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2020-11494) Piotr Krysiuk discovered that race conditions existed in the file system implementation in the Linux kernel. A local attacker could use this to cause a denial of service (system crash). (CVE-2020-12114) Update instructions The problem can be corrected by updating your kernel livepatch to the following versions: Ubuntu 18.04 LTS aws - 68.1 generic - 68.1 lowlatency - 68.1 oem - 68.1 Ubuntu 16.04 LTS aws - 68.1 generic - 67.1 generic - 68.1 lowlatency - 67.1 lowlatency - 68.1 Ubuntu 14.04 ESM generic - 66.1 lowlatency - 66.1 Support Information Kernels older than the levels listed below do not receive livepatch updates. If you are running a kernel version earlier than the one listed below, please upgrade your kernel as soon as possible. Ubuntu 18.04 LTS linux - 4.15.0-69 linux-aws - 4.15.0-1054 linux-azure - 5.0.0-1025 linux-gcp - 5.0.0-1025 linux-oem - 4.15.0-1063 Ubuntu 20.04 LTS linux - 5.4.0-26 linux-aws - 5.4.0-1009 linux-azure - 5.4.0-1010 linux-gcp - 5.4.0-1009 linux-oem - 5.4.0-26 Ubuntu 16.04 LTS linux - 4.4.0-168 linux-aws - 4.4.0-1098 linux-azure - 4.15.0-1063 linux-hwe - 4.15.0-69 Ubuntu 14.04 ESM linux-lts-xenial - 4.4.0-168 References o CVE-2020-0543 o CVE-2020-8647 o CVE-2020-8648 o CVE-2020-8649 o CVE-2020-11494 o CVE-2020-12114 - --------------------------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). 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