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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2020.2018 USN-4385-2: Intel Microcode regression 11 June 2020 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Intel Microcode Publisher: Ubuntu Operating System: Ubuntu Impact/Access: Access Privileged Data -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2020-0549 CVE-2020-0548 CVE-2020-0543 Reference: ESB-2020.2011 ESB-2020.2009 ESB-2020.2004 ESB-2020.2003 Original Bulletin: https://usn.ubuntu.com/4385-2/ - --------------------------BEGIN INCLUDED TEXT-------------------- USN-4385-2: Intel Microcode regression 10 June 2020 intel-microcode regression A security issue affects these releases of Ubuntu and its derivatives: o Ubuntu 20.04 LTS o Ubuntu 19.10 o Ubuntu 18.04 LTS o Ubuntu 16.04 LTS o Ubuntu 14.04 ESM Summary USN-4385-1 introduced a regression in the Intel Microcode for some processors. Software Description o intel-microcode - Processor microcode for Intel CPUs Details USN-4385-1 provided updated Intel Processor Microcode. Unfortunately, that update prevented certain processors in the Intel Skylake family (06_4EH) from booting successfully. Additonally, on Ubuntu 20.04 LTS, late loading of microcode was enabled, which could lead to system instability. This update reverts the microcode update for the Skylake processor family and disables the late loading option on Ubuntu 20.04 LTS. Please note that the 'dis_ucode_ldr' kernel command line option can be added in the boot menu to disable microcode loading for system recovery. We apologize for the inconvenience. Original advisory details: It was discovered that memory contents previously stored in microarchitectural special registers after RDRAND, RDSEED, and SGX EGETKEY read operations on Intel client and Xeon E3 processors may be briefly exposed to processes on the same or different processor cores. A local attacker could use this to expose sensitive information. (CVE-2020-0543) It was discovered that on some Intel processors, partial data values previously read from a vector register on a physical core may be propagated into unused portions of the store buffer. A local attacker could possible use this to expose sensitive information. (CVE-2020-0548) It was discovered that on some Intel processors, data from the most recently evicted modified L1 data cache (L1D) line may be propagated into an unused (invalid) L1D fill buffer. A local attacker could possibly use this to expose sensitive information. (CVE-2020-0549) Update instructions The problem can be corrected by updating your system to the following package versions: Ubuntu 20.04 LTS intel-microcode - 3.20200609.0ubuntu0.20.04.2 Ubuntu 19.10 intel-microcode - 3.20200609.0ubuntu0.19.10.2 Ubuntu 18.04 LTS intel-microcode - 3.20200609.0ubuntu0.18.04.1 Ubuntu 16.04 LTS intel-microcode - 3.20200609.0ubuntu0.16.04.1 Ubuntu 14.04 ESM intel-microcode - 3.20200609.0ubuntu0.14.04.1 To update your system, please follow these instructions: https:// wiki.ubuntu.com/Security/Upgrades . After a standard system update you need to reboot your computer to make all the necessary changes. References o USN-4385-1 o LP: 1882890 o LP: 1883002 - --------------------------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 iQIVAwUBXuFvEONLKJtyKPYoAQgaEA/+Keo3VnRQkjJeYm/hGgCGq/F0FRkyF7So agLgMXLMxTeY6Q+KaNQv3857YlYFl7okiRNbFRsQbehS9yeAfgJyb1eQdTYrMOhr LrsqAVnRpkHQauOnGV/Tv4baLftops8fbiBmDdaXv8Sa5mBWN5cRtYnuWredWVlb SGhnin/koo7f+mRjdJpcQxu8snXU2RN7unMl+1o1R2yAPYQT4OjPYFvSluv88loG D0CH1V3KiEUCo4XzqS0f0PyFvtx2HHrBHvo3ytrbqTeFPlabv4UOhhDToFpD8RyO dSPGLnJzlPsLM6BNKywKoqUVMsBiY3W4V2Chf4cmCzobYarKfJRfXoOkyPeqtfJz XJRu7afhVloXx1NSXoD3wbBf4+wuDjMRlo9oCYMzN5HYkl3u64Tjlfo8E9+kJyXR ES13DSfY+gtdHEaOoubtwdZug4LcfoJDc2LuPmkNWNdaLaqDk5PqOr37z+GcHA+j W8Tm3QPkZOkWbzIc3UDhrckJsR5wkSPPnMRmrpJ3N6IYCtD0+gH5QF4jEuw6r7Qs lIiPOyxQlH7C8YD0EuV63qS+SMd3bU3MCVuBAskbZgK83ondwlDIRQR3oM5tSC2W P4kq+7jSYeMadpveg1aiNN63OcdWLOVcHl90O3C5TsnGOZW+/Z0LmB2kYFK+HYxU 7nya/UGInx4= =chuN -----END PGP SIGNATURE-----