========================================================================== Ubuntu Security Notice USN-4658-1 December 02, 2020 linux, linux-aws, linux-aws-5.4, linux-azure, linux-azure-5.4, linux-gcp, linux-gcp-5.4, linux-hwe-5.4, linux-kvm, linux-oracle, linux-oracle-5.4 vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 20.04 LTS - Ubuntu 18.04 LTS Summary: Several security issues were fixed in the Linux kernel. Software Description: - linux: Linux kernel - linux-aws: Linux kernel for Amazon Web Services (AWS) systems - linux-azure: Linux kernel for Microsoft Azure Cloud systems - linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems - linux-kvm: Linux kernel for cloud environments - linux-oracle: Linux kernel for Oracle Cloud systems - linux-aws-5.4: Linux kernel for Amazon Web Services (AWS) systems - linux-azure-5.4: Linux kernel for Microsoft Azure cloud systems - linux-gcp-5.4: Linux kernel for Google Cloud Platform (GCP) systems - linux-hwe-5.4: Linux hardware enablement (HWE) kernel - linux-oracle-5.4: Linux kernel for Oracle Cloud systems Details: It was discovered that a race condition existed in the binder IPC implementation in the Linux kernel, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2020-0423) Daniele Antonioli, Nils Ole Tippenhauer, and Kasper Rasmussen discovered that legacy pairing and secure-connections pairing authentication in the Bluetooth protocol could allow an unauthenticated user to complete authentication without pairing credentials via adjacent access. A physically proximate attacker could use this to impersonate a previously paired Bluetooth device. (CVE-2020-10135) It was discovered that a race condition existed in the perf subsystem of the Linux kernel, leading to a use-after-free vulnerability. An attacker with access to the perf subsystem could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2020-14351) It was discovered that the frame buffer implementation in the Linux kernel did not properly handle some edge cases in software scrollback. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2020-14390) It was discovered that the netfilter connection tracker for netlink in the Linux kernel did not properly perform bounds checking in some situations. A local attacker could use this to cause a denial of service (system crash). (CVE-2020-25211) It was discovered that the Rados block device (rbd) driver in the Linux kernel did not properly perform privilege checks for access to rbd devices in some situations. A local attacker could use this to map or unmap rbd block devices. (CVE-2020-25284) It was discovered that the HDLC PPP implementation in the Linux kernel did not properly validate input in some situations. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2020-25643) It was discovered that the GENEVE tunnel implementation in the Linux kernel when combined with IPSec did not properly select IP routes in some situations. An attacker could use this to expose sensitive information (unencrypted network traffic). (CVE-2020-25645) Keyu Man discovered that the ICMP global rate limiter in the Linux kernel could be used to assist in scanning open UDP ports. A remote attacker could use to facilitate attacks on UDP based services that depend on source port randomization. (CVE-2020-25705) It was discovered that the framebuffer implementation in the Linux kernel did not properly perform range checks in certain situations. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2020-28915) It was discovered that Power 9 processors could be coerced to expose information from the L1 cache in certain situations. A local attacker could use this to expose sensitive information. (CVE-2020-4788) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 20.04 LTS: linux-image-5.4.0-1028-kvm 5.4.0-1028.29 linux-image-5.4.0-1030-aws 5.4.0-1030.31 linux-image-5.4.0-1030-gcp 5.4.0-1030.32 linux-image-5.4.0-1030-oracle 5.4.0-1030.32 linux-image-5.4.0-1032-azure 5.4.0-1032.33 linux-image-5.4.0-56-generic 5.4.0-56.62 linux-image-5.4.0-56-generic-lpae 5.4.0-56.62 linux-image-5.4.0-56-lowlatency 5.4.0-56.62 linux-image-aws 5.4.0.1030.31 linux-image-azure 5.4.0.1032.30 linux-image-gcp 5.4.0.1030.38 linux-image-generic 5.4.0.56.59 linux-image-generic-hwe-20.04 5.4.0.56.59 linux-image-generic-lpae 5.4.0.56.59 linux-image-generic-lpae-hwe-20.04 5.4.0.56.59 linux-image-gke 5.4.0.1030.38 linux-image-kvm 5.4.0.1028.26 linux-image-lowlatency 5.4.0.56.59 linux-image-lowlatency-hwe-20.04 5.4.0.56.59 linux-image-oem 5.4.0.56.59 linux-image-oem-osp1 5.4.0.56.59 linux-image-oracle 5.4.0.1030.27 linux-image-virtual 5.4.0.56.59 linux-image-virtual-hwe-20.04 5.4.0.56.59 Ubuntu 18.04 LTS: linux-image-5.4.0-1030-aws 5.4.0-1030.31~18.04.1 linux-image-5.4.0-1030-gcp 5.4.0-1030.32~18.04.1 linux-image-5.4.0-1030-oracle 5.4.0-1030.32~18.04.1 linux-image-5.4.0-1032-azure 5.4.0-1032.33~18.04.1 linux-image-5.4.0-56-generic 5.4.0-56.62~18.04.1 linux-image-5.4.0-56-generic-lpae 5.4.0-56.62~18.04.1 linux-image-5.4.0-56-lowlatency 5.4.0-56.62~18.04.1 linux-image-aws 5.4.0.1030.15 linux-image-azure 5.4.0.1032.14 linux-image-gcp 5.4.0.1030.18 linux-image-generic-hwe-18.04 5.4.0.56.62~18.04.50 linux-image-generic-lpae-hwe-18.04 5.4.0.56.62~18.04.50 linux-image-lowlatency-hwe-18.04 5.4.0.56.62~18.04.50 linux-image-oem-osp1 5.4.0.56.62~18.04.50 linux-image-oracle 5.4.0.1030.14 linux-image-snapdragon-hwe-18.04 5.4.0.56.62~18.04.50 linux-image-virtual-hwe-18.04 5.4.0.56.62~18.04.50 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: https://usn.ubuntu.com/4658-1 CVE-2020-0423, CVE-2020-10135, CVE-2020-14351, CVE-2020-14390, CVE-2020-25211, CVE-2020-25284, CVE-2020-25643, CVE-2020-25645, CVE-2020-25705, CVE-2020-28915, CVE-2020-4788 Package Information: https://launchpad.net/ubuntu/+source/linux/5.4.0-56.62 https://launchpad.net/ubuntu/+source/linux-aws/5.4.0-1030.31 https://launchpad.net/ubuntu/+source/linux-azure/5.4.0-1032.33 https://launchpad.net/ubuntu/+source/linux-gcp/5.4.0-1030.32 https://launchpad.net/ubuntu/+source/linux-kvm/5.4.0-1028.29 https://launchpad.net/ubuntu/+source/linux-oracle/5.4.0-1030.32 https://launchpad.net/ubuntu/+source/linux-aws-5.4/5.4.0-1030.31~18.04.1 https://launchpad.net/ubuntu/+source/linux-azure-5.4/5.4.0-1032.33~18.04.1 https://launchpad.net/ubuntu/+source/linux-gcp-5.4/5.4.0-1030.32~18.04.1 https://launchpad.net/ubuntu/+source/linux-hwe-5.4/5.4.0-56.62~18.04.1 https://launchpad.net/ubuntu/+source/linux-oracle-5.4/5.4.0-1030.32~18.04.1