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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.2543 LSN-0079-1: Kernel Live Patch Security Notice 28 July 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: kernel Publisher: Ubuntu Operating System: Ubuntu Impact/Access: Root Compromise -- Existing Account Execute Arbitrary Code/Commands -- Existing Account Denial of Service -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2021-33909 CVE-2021-3600 Reference: ESB-2021.2532 ESB-2021.2512 ESB-2021.2459 ESB-2021.2453 Original Bulletin: https://ubuntu.com/security/notices/LSN-0079-1 - --------------------------BEGIN INCLUDED TEXT-------------------- LSN-0079-1: Kernel Live Patch Security Notice 26 July 2021 Several security issues were fixed in the kernel. Releases o Ubuntu 20.04 LTS o Ubuntu 18.04 LTS o Ubuntu 16.04 ESM o Ubuntu 14.04 ESM Software Description o gcp - Linux kernel for Google Cloud Platform (GCP) systems - (>= 5.4.0-1009) o generic-4.15 - Linux kernel - (>= 4.15.0-69) o generic-4.4 - Linux kernel - (>= 4.4.0-168, >= 4.4.0-168) o generic-5.4 - Linux kernel - (>= 5.4.0-26, >= 5.4.0-26) o gke - Linux kernel for Google Container Engine (GKE) systems - (>= 5.4.0-1033) o gke-4.15 - Linux kernel for Google Container Engine (GKE) systems - (>= 4.15.0-1076) o gke-5.4 - Linux kernel for Google Container Engine (GKE) systems - (>= 5.4.0-1009) o gkeop - Linux kernel for Google Container Engine (GKE) systems - (>= 5.4.0-1009) o gkeop-5.4 - Linux kernel for Google Container Engine (GKE) systems - (>= 5.4.0-1007) o lowlatency-4.15 - Linux kernel - (>= 4.15.0-69) o lowlatency-4.4 - Linux kernel - (>= 4.4.0-168, >= 4.4.0-168) o lowlatency-5.4 - Linux kernel - (>= 5.4.0-26, >= 5.4.0-26) o oem - Linux kernel for OEM systems - (>= 4.15.0-1063) Details It was discovered that the eBPF implementation in the Linux kernel did not properly track bounds information for 32 bit registers when performing div and mod operations. A local attacker could use this to possibly execute arbitrary code.( CVE-2021-3600 ) It was discovered that the virtual file system implementation in the Linux kernel contained an unsigned to signed integer conversion error. A local attacker could use this to cause a denial of service (system crash) or execute arbitrary code.( CVE-2021-33909 ) Checking update status The problem can be corrected in these Livepatch versions: Kernel type 20.04 18.04 16.04 14.04 gcp 79.1 - - - generic-4.15 - 79.1 - - generic-4.4 - - 79.1 79.1 generic-5.4 79.1 79.1 - - gke 79.1 - - - gke-4.15 - 79.1 - - gke-5.4 - 79.1 - - gkeop 79.1 - - - gkeop-5.4 - 79.1 - - lowlatency-4.15 - 79.1 - - lowlatency-4.4 - - 79.1 79.1 lowlatency-5.4 79.1 79.1 - - oem - 79.1 - - To check your kernel type and Livepatch version, enter this command: canonical-livepatch status References o CVE-2021-3600 o CVE-2021-33909 - --------------------------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 iQIVAwUBYQCnEONLKJtyKPYoAQiqpQ//a6SHNQNaJVhblMUcHnkLi22HbJz0nhBr gW9qZv48C7pVYzzyWemZqP4T7xY555WEV85RLT8ZxSd9JCzTu4JXjS6sG/9f/rdr 5sr94u7SU1Axz9JLxIiB8kgn7A/tfYMi8yzkFWN4iduoxsD/4uHNMA0DaeiF6JXs p0MykN70qvugYfkO4Fatp5knc8P1EN6Q+fMLDMh8V2ZxVt5Aue26gJgH4SLKbJRR fUo/dXaEX91ksk0QiCzVtbCTw51aWPfcxIbsVUpBhnyfaugeUmApyUi4ope8YOiC 8UPEai1PMpl5RZvmBaE/vfuAiBKyewM9a7un9WgFXO1obfi7JNBFEgqH2LDh39NO Nv+ChAv+YueXF1zBaXDSfZYkTPHGU10huKiptm2HckOU1rYvWF9NEHHX5xmB//9x DFaYumPv5gajkjDCyPkjLXIeR98kWlDe9ERaJiARk4opY3lgZ8IWrQlfDdgzF/LK 9jw5ODdnDdM6Od1qJQ5zR+uBGlzgZ6fzo/6wCoNlAzAX1nH8adneKOPlivMUKDW9 qSqBjlO+q8UlKB90KbdqlKdTHAVBntVZ2qeC8Om9ElVKAN7mIb6vY5Rne5UkhKYu LNO/69d6l1k6PTCK3FgZM/nA8sdLN3Qr3lUkWeM7QFSlXUVrpAzPEqErY+ACH5I3 uNHlhpiB9eA= =DbqC -----END PGP SIGNATURE-----