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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2020.1779.3 Ubuntu Linux kernel vulnerabilities 29 May 2020 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: kernel Publisher: Ubuntu Operating System: Ubuntu Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated Access Privileged Data -- Existing Account Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2020-12657 CVE-2020-11669 CVE-2020-11668 CVE-2020-11609 CVE-2020-11608 CVE-2020-11565 CVE-2020-11494 CVE-2019-19769 CVE-2019-19377 Reference: ESB-2020.1768.2 ESB-2020.1745.2 ESB-2020.1585 Original Bulletin: https://usn.ubuntu.com/4367-1/ https://usn.ubuntu.com/4368-1/ https://usn.ubuntu.com/4367-2/ Comment: This bulletin contains four (4) Ubuntu security advisories. Revision History: May 29 2020: Vendor published USN-4367-2: a regression in overlayfs is now fixed May 21 2020: Vendor released minor update May 20 2020: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- USN-4367-1: Linux kernel vulnerabilities 19 May 2020 linux, linux-aws, linux-gcp, linux-kvm, linux-oracle, linux-riscv vulnerabilities A security issue affects these releases of Ubuntu and its derivatives: o Ubuntu 20.04 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-riscv - Linux kernel for RISC-V systems Details It was discovered that the btrfs implementation in the Linux kernel did not properly detect that a block was marked dirty in some situations. An attacker could use this to specially craft a file system image that, when unmounted, could cause a denial of service (system crash). (CVE-2019-19377) It was discovered that the linux kernel did not properly validate certain mount options to the tmpfs virtual memory file system. A local attacker with the ability to specify mount options could use this to cause a denial of service (system crash). (CVE-2020-11565) It was discovered that the block layer in the Linux kernel contained a race condition leading to a use-after-free vulnerability. A local attacker could possibly use this to cause a denial of service (system crash) or execute arbitrary code. (CVE-2020-12657) Update instructions The problem can be corrected by updating your system to the following package versions: Ubuntu 20.04 LTS linux-image-5.4.0-1011-aws - 5.4.0-1011.11 linux-image-5.4.0-1011-gcp - 5.4.0-1011.11 linux-image-5.4.0-1011-kvm - 5.4.0-1011.11 linux-image-5.4.0-1011-oracle - 5.4.0-1011.11 linux-image-5.4.0-26-generic - 5.4.0-26.30 linux-image-5.4.0-31-generic - 5.4.0-31.35 linux-image-5.4.0-31-generic-lpae - 5.4.0-31.35 linux-image-5.4.0-31-lowlatency - 5.4.0-31.35 linux-image-aws - 5.4.0.1011.14 linux-image-gcp - 5.4.0.1011.12 linux-image-generic - 5.4.0.26.33 linux-image-generic-lpae - 5.4.0.31.36 linux-image-gke - 5.4.0.1011.12 linux-image-kvm - 5.4.0.1011.12 linux-image-lowlatency - 5.4.0.31.36 linux-image-oem - 5.4.0.31.36 linux-image-oem-osp1 - 5.4.0.31.36 linux-image-oracle - 5.4.0.1011.12 linux-image-virtual - 5.4.0.26.33 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-2019-19377 o CVE-2020-11565 o CVE-2020-12657 - ----------------------------------------------------------------------------- USN-4368-1: Linux kernel vulnerabilities 19 May 2020 linux-gke-5.0, linux-oem-osp1 vulnerabilities A security issue affects these releases of Ubuntu and its derivatives: o Ubuntu 18.04 LTS Summary Several security issues were fixed in the Linux kernel. Software Description o linux-gke-5.0 - Linux kernel for Google Container Engine (GKE) systems o linux-oem-osp1 - Linux kernel for OEM systems Details Tristan Madani discovered that the file locking implementation in the Linux kernel contained a race condition. A local attacker could possibly use this to cause a denial of service or expose sensitive information. (CVE-2019-19769) 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) It was discovered that the linux kernel did not properly validate certain mount options to the tmpfs virtual memory file system. A local attacker with the ability to specify mount options could use this to cause a denial of service (system crash). (CVE-2020-11565) It was discovered that the OV51x USB Camera device driver in the Linux kernel did not properly validate device metadata. A physically proximate attacker could use this to cause a denial of service (system crash). (CVE-2020-11608) It was discovered that the STV06XX USB Camera device driver in the Linux kernel did not properly validate device metadata. A physically proximate attacker could use this to cause a denial of service (system crash). (CVE-2020-11609) It was discovered that the Xirlink C-It USB Camera device driver in the Linux kernel did not properly validate device metadata. A physically proximate attacker could use this to cause a denial of service (system crash). (CVE-2020-11668) David Gibson discovered that the Linux kernel on Power9 CPUs did not properly save and restore Authority Mask registers state in some situations. A local attacker in a guest VM could use this to cause a denial of service (host system crash). (CVE-2020-11669) It was discovered that the block layer in the Linux kernel contained a race condition leading to a use-after-free vulnerability. A local attacker could possibly use this to cause a denial of service (system crash) or execute arbitrary code. (CVE-2020-12657) Update instructions The problem can be corrected by updating your system to the following package versions: Ubuntu 18.04 LTS linux-image-5.0.0-1037-gke - 5.0.0-1037.38 linux-image-5.0.0-1052-oem-osp1 - 5.0.0-1052.57 linux-image-gke-5.0 - 5.0.0.1037.25 linux-image-oem-osp1 - 5.0.0.1052.55 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-2019-19769 o CVE-2020-11494 o CVE-2020-11565 o CVE-2020-11608 o CVE-2020-11609 o CVE-2020-11668 o CVE-2020-11669 o CVE-2020-12657 - ------------------------------------------------------------------------------ LSN-0067-1: Kernel Live Patch Security Notice 20 May 2020 Linux kernel vulnerabilities A security issue affects these releases of Ubuntu and its derivatives: o Ubuntu 18.04 LTS o Ubuntu 16.04 LTS 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-azure - Linux kernel for Microsoft Azure Cloud systems o linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems o linux-oem - Linux kernel for OEM systems Details 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) Update instructions The problem can be corrected by updating your kernel livepatch to the following versions: Ubuntu 18.04 LTS aws - 67.1 azure - 67.1 gcp - 67.1 generic - 67.1 lowlatency - 67.1 oem - 67.1 Ubuntu 16.04 LTS aws - 67.1 generic - 67.1 lowlatency - 67.1 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-2020-11494 - -------------------------------------------------------------------------------- USN-4367-2: Linux kernel regression 28 May 2020 linux regression A security issue affects these releases of Ubuntu and its derivatives: o Ubuntu 20.04 LTS Summary USN-4367-1 introduced a regression in the Linux kernel. Software Description o linux - Linux kernel Details USN-4367-1 fixed vulnerabilities in the 5.4 Linux kernel. Unfortunately, that update introduced a regression in overlayfs. This update corrects the problem. We apologize for the inconvenience. Original advisory details: It was discovered that the btrfs implementation in the Linux kernel did not properly detect that a block was marked dirty in some situations. An attacker could use this to specially craft a file system image that, when unmounted, could cause a denial of service (system crash). (CVE-2019-19377) It was discovered that the linux kernel did not properly validate certain mount options to the tmpfs virtual memory file system. A local attacker with the ability to specify mount options could use this to cause a denial of service (system crash). (CVE-2020-11565) It was discovered that the block layer in the Linux kernel contained a race condition leading to a use-after-free vulnerability. A local attacker could possibly use this to cause a denial of service (system crash) or execute arbitrary code. (CVE-2020-12657) Update instructions The problem can be corrected by updating your system to the following package versions: Ubuntu 20.04 LTS linux-image-5.4.0-33-generic - 5.4.0-33.37 linux-image-5.4.0-33-generic-lpae - 5.4.0-33.37 linux-image-5.4.0-33-lowlatency - 5.4.0-33.37 linux-image-generic - 5.4.0.33.38 linux-image-generic-lpae - 5.4.0.33.38 linux-image-lowlatency - 5.4.0.33.38 linux-image-oem - 5.4.0.33.38 linux-image-oem-osp1 - 5.4.0.33.38 linux-image-virtual - 5.4.0.33.38 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 USN-4367-1 o LP: 1879690 - --------------------------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. 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On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBXtB4xONLKJtyKPYoAQjNcRAAj9ZTFs8Uk97DoaI1FRd3Lya1CNiOmcrE r3aec+EQ7g0jrHfM7vFDE3NujgorQjFwWkq4KNOx8ngq76rzuhSML6aaWaxgPaoB rP4rXpTcRR/smZoiAuhMO/7UsYEGew9mG2iIVIcEncH2pFY/YVMLmdWeYjhEaQg6 nfL092BXzCEB0wTItrs4uS4+QoAAmWirshE0Mp/3JNS7109o5Lam9p6uCiD/sNfU mjdBzuGc9BV2g+RWAvu2CvoZEbdkwRUhGBOLIo6znPeWQTIhj+zjNw/OH5S/Os3T QdYnbuktci55bM9SaaKUk+E+YaQQ46UjukDutg3f/qwr3uPZV4BjFeP/5Jnx01Xv 5NBV5ZLNW34JKAQbrKGPxMwP0QPytsoDx/ipx+oxk8Qul48fWKbYmIK+7gQ1Dflq reEM8E626V9ZzXbM4tfMHqvQE0grB3rq2886k6lvVIXnN13O0MzE1oRXAw0485yW /xwrDiHWn2FCcMpzEGkQDyK/kaPpHvCibviIt7n+bsYs5QkW2ojGcTKScyts2jcu JODtqK0hn0As8wiFm/r2icOOsLVT8JLTwWzko6fONd8yuWlTjgyLURileJcsnnlG z4+N6+JXjhMPeQQQpmHa6W/2WWoON/0oIO0R/c0o3pSZb0WVhsA8r+WZB2KYLqIy R9lKjMMGIBQ= =3Zef -----END PGP SIGNATURE-----