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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2020.0945 USN-4300-1: Linux kernel vulnerabilities 18 March 2020 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: kernel Publisher: Ubuntu Operating System: Ubuntu Impact/Access: Denial of Service -- Remote/Unauthenticated Access Confidential Data -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2020-2732 CVE-2019-19068 CVE-2019-19066 CVE-2019-19064 CVE-2019-19059 CVE-2019-19058 CVE-2019-19056 CVE-2019-19053 CVE-2019-19043 CVE-2019-18809 CVE-2019-3016 Reference: ESB-2020.0141 ESB-2019.4772 ESB-2019.4704 Original Bulletin: https://usn.ubuntu.com/4300-1/ - --------------------------BEGIN INCLUDED TEXT-------------------- USN-4300-1: Linux kernel vulnerabilities 16 March 2020 linux, linux-aws, linux-gcp, linux-gcp-5.3, linux-gke-5.3, linux-hwe, linux-kvm, linux-oracle, linux-raspi2, linux-raspi2-5.3 vulnerabilities A security issue affects these releases of Ubuntu and its derivatives: o Ubuntu 19.10 o Ubuntu 18.04 LTS Summary Several security issues were fixed in the Linux kernel. Software Description o linux - Linux kernel o linux-aws - Linux kernel for Amazon Web Services (AWS) systems o linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems o linux-kvm - Linux kernel for cloud environments o linux-oracle - Linux kernel for Oracle Cloud systems o linux-raspi2 - Linux kernel for Raspberry Pi 2 o linux-gcp-5.3 - Linux kernel for Google Cloud Platform (GCP) systems o linux-gke-5.3 - Linux kernel for Google Container Engine (GKE) systems o linux-hwe - Linux hardware enablement (HWE) kernel o linux-raspi2-5.3 - Linux kernel for Raspberry Pi 2 Details It was discovered that the KVM implementation in the Linux kernel, when paravirtual TLB flushes are enabled in guests, the hypervisor in some situations could miss deferred TLB flushes or otherwise mishandle them. An attacker in a guest VM could use this to expose sensitive information (read memory from another guest VM). (CVE-2019-3016) Paulo Bonzini discovered that the KVM hypervisor implementation in the Linux kernel could improperly let a nested (level 2) guest access the resources of a parent (level 1) guest in certain situations. An attacker could use this to expose sensitive information. (CVE-2020-2732) It was discovered that the Afatech AF9005 DVB-T USB device driver in the Linux kernel did not properly deallocate memory in certain error conditions. A local attacker could possibly use this to cause a denial of service (kernel memory exhaustion). (CVE-2019-18809) It was discovered that the Intel XL710 Ethernet Controller device driver in the Linux kernel did not properly deallocate memory in certain error conditions. A local attacker could possibly use this to cause a denial of service (kernel memory exhaustion). (CVE-2019-19043) It was discovered that the RPMSG character device interface in the Linux kernel did not properly deallocate memory in certain error conditions. A local attacker could possibly use this to cause a denial of service (kernel memory exhaustion). (CVE-2019-19053) It was discovered that the Marvell Wi-Fi device driver in the Linux kernel did not properly deallocate memory in certain error conditions. A local attacker could use this to possibly cause a denial of service (kernel memory exhaustion). (CVE-2019-19056) It was discovered that the Intel Wi-Fi device driver in the Linux kernel device driver in the Linux kernel did not properly deallocate memory in certain error conditions. A local attacker could possibly use this to cause a denial of service (kernel memory exhaustion). (CVE-2019-19058, CVE-2019-19059) It was discovered that the Serial Peripheral Interface (SPI) driver in the Linux kernel device driver in the Linux kernel did not properly deallocate memory in certain error conditions. A local attacker could possibly use this to cause a denial of service (kernel memory exhaustion). (CVE-2019-19064) It was discovered that the Brocade BFA Fibre Channel device driver in the Linux kernel did not properly deallocate memory in certain error conditions. A local attacker could possibly use this to cause a denial of service (kernel memory exhaustion). (CVE-2019-19066) It was discovered that the Realtek RTL8xxx USB Wi-Fi device driver in the Linux kernel did not properly deallocate memory in certain error conditions. A local attacker could possibly use this to cause a denial of service (kernel memory exhaustion). (CVE-2019-19068) Update instructions The problem can be corrected by updating your system to the following package versions: Ubuntu 19.10 linux-image-5.3.0-1011-oracle - 5.3.0-1011.12 linux-image-5.3.0-1012-kvm - 5.3.0-1012.13 linux-image-5.3.0-1013-aws - 5.3.0-1013.14 linux-image-5.3.0-1014-gcp - 5.3.0-1014.15 linux-image-5.3.0-1019-raspi2 - 5.3.0-1019.21 linux-image-5.3.0-42-generic - 5.3.0-42.34 linux-image-5.3.0-42-generic-lpae - 5.3.0-42.34 linux-image-5.3.0-42-lowlatency - 5.3.0-42.34 linux-image-5.3.0-42-snapdragon - 5.3.0-42.34 linux-image-aws - 5.3.0.1013.15 linux-image-gcp - 5.3.0.1014.15 linux-image-generic - 5.3.0.42.36 linux-image-generic-lpae - 5.3.0.42.36 linux-image-gke - 5.3.0.1014.15 linux-image-kvm - 5.3.0.1012.14 linux-image-lowlatency - 5.3.0.42.36 linux-image-oracle - 5.3.0.1011.12 linux-image-raspi2 - 5.3.0.1019.16 linux-image-snapdragon - 5.3.0.42.36 linux-image-virtual - 5.3.0.42.36 Ubuntu 18.04 LTS linux-image-5.3.0-1014-gcp - 5.3.0-1014.15~18.04.1 linux-image-5.3.0-1014-gke - 5.3.0-1014.15~18.04.1 linux-image-5.3.0-1019-raspi2 - 5.3.0-1019.21~18.04.1 linux-image-5.3.0-42-generic - 5.3.0-42.34~18.04.1 linux-image-5.3.0-42-generic-lpae - 5.3.0-42.34~18.04.1 linux-image-5.3.0-42-lowlatency - 5.3.0-42.34~18.04.1 linux-image-gcp-edge - 5.3.0.1014.13 linux-image-generic-hwe-18.04 - 5.3.0.42.99 linux-image-generic-lpae-hwe-18.04 - 5.3.0.42.99 linux-image-gke-5.3 - 5.3.0.1014.4 linux-image-lowlatency-hwe-18.04 - 5.3.0.42.99 linux-image-raspi2-hwe-18.04 - 5.3.0.1019.8 linux-image-snapdragon-hwe-18.04 - 5.3.0.42.99 linux-image-virtual-hwe-18.04 - 5.3.0.42.99 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. ATTENTION: Due to an unavoidable ABI change the kernel updates have been given a new version number, which requires you to recompile and reinstall all third party kernel modules you might have installed. Unless you manually uninstalled the standard kernel metapackages (e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual, linux-powerpc), a standard system upgrade will automatically perform this as well. References o CVE-2019-18809 o CVE-2019-19043 o CVE-2019-19053 o CVE-2019-19056 o CVE-2019-19058 o CVE-2019-19059 o CVE-2019-19064 o CVE-2019-19066 o CVE-2019-19068 o CVE-2019-3016 o CVE-2020-2732 - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. 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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 iQIVAwUBXnF7eWaOgq3Tt24GAQiSYQ/+J3dq8WRhXGUiLycHoOPEoQKE05RIWcQu U6qgcXODtT+AeRn3BxBnR1MuiITMlzrPzzrY/KwTcMI3flP2SGAWY5QC6ijvEBIi QD0JVGrLvfO6AEd2jyy1vycLsFsCnytKCQLoIuQECF/+Ocl81Bodt6IF7wwnb6wx YJX+O2RwcXp3etQJOtgebpqhDZIezswcIFLf71rheSRy6ApEFy3qdihVZOUbwk7e C3gQhNovYiN+ihjiutyurQjQ9vuxCvPRpJpNyiORAH/frNxzrhYB8AvDJ5NGaASd YjUGaF1bEMbRiSV4KciFYK+/BiZm6VapIHVnbvhRMOtOMYvS3s+6UQPRUopzX6Br L41yNFaSo2zzlQoqoDV58kkEkjLFyBxCCd83+LzRL0o+xolZ5Fp8Vn+xidCD8Uul Xlgs2mJrzt7xxzBvTKkbSpJH7VP1HaUCXsJf7rFBjk7+4lyAy/CzOg3IQkDQ89LM 9VyZyzEy7wuhk2fWB7/fJ1l3moCWmmUVmtmBfuLixMSmlCY56zSqFVSijReuuQ+a tLVxk1O8ojCMvnn22Xq92fvP3AWLFLRlOsOCIT9MhOletbdvi/5fweZCpbhl9RYA +j7UQpH8mIRdnmHo0TqgYnGCEJ3q5gXrHQ92ZxjTki0iwcDnIyNP44kHtwo8vEAw l3foiB3BuJw= =jZg2 -----END PGP SIGNATURE-----