Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2020.4275.2 USN-4657-1: Linux kernel vulnerabilities 14 December 2020 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: kernel Publisher: Ubuntu Operating System: Ubuntu Impact/Access: Execute Arbitrary Code/Commands -- Existing Account Increased Privileges -- Existing Account Access Privileged Data -- Existing Account Denial of Service -- Existing Account Access Confidential Data -- Remote/Unauthenticated Unauthorised Access -- Remote/Unauthenticated Reduced Security -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2020-28915 CVE-2020-25705 CVE-2020-25645 CVE-2020-25643 CVE-2020-25284 CVE-2020-25211 CVE-2020-14390 CVE-2020-14351 CVE-2020-12352 CVE-2020-10135 CVE-2020-4788 CVE-2020-0427 Reference: ESB-2020.4219 ESB-2020.4211 ESB-2020.4191 ESB-2020.4168 Original Bulletin: https://ubuntu.com/security/notices/USN-4657-1 https://ubuntu.com/security/notices/USN-4658-1 https://ubuntu.com/security/notices/USN-4659-1 https://ubuntu.com/security/notices/USN-4659-2 https://ubuntu.com/security/notices/USN-4658-2 Comment: This bulletin contains five (5) Ubuntu security advisories. Revision History: December 14 2020: USN-4659-1 and USN-4658-1 introduced regressions in the Linux kernel December 2 2020: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- USN-4659-2: Linux kernel regression 13 December 2020 USN-4659-1 introduced a regression in the Linux kernel. Releases o Ubuntu 20.10 Packages 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-kvm - Linux kernel for cloud environments o linux-oracle - Linux kernel for Oracle Cloud systems o linux-raspi - Linux kernel for Raspberry Pi (V8) systems Details USN-4659-1 fixed vulnerabilities in the Linux kernel. Unfortunately, that update introduced a regression in the software raid10 driver when used with fstrim that could lead to data corruption. This update fixes the problem. Original advisory 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) 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 KVM hypervisor in the Linux kernel did not properly handle interrupts in certain situations. A local attacker in a guest VM could possibly use this to cause a denial of service (host system crash). (CVE-2020-27152) 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 20.10 o linux-image-5.8.0-1010-raspi - 5.8.0-1010.13 o linux-image-5.8.0-1010-raspi-nolpae - 5.8.0-1010.13 o linux-image-5.8.0-1013-kvm - 5.8.0-1013.14 o linux-image-5.8.0-1013-oracle - 5.8.0-1013.13 o linux-image-5.8.0-1014-gcp - 5.8.0-1014.14 o linux-image-5.8.0-1015-azure - 5.8.0-1015.16 o linux-image-5.8.0-1016-aws - 5.8.0-1016.17 o linux-image-5.8.0-33-generic - 5.8.0-33.36 o linux-image-5.8.0-33-generic-64k - 5.8.0-33.36 o linux-image-5.8.0-33-generic-lpae - 5.8.0-33.36 o linux-image-5.8.0-33-lowlatency - 5.8.0-33.36 o linux-image-aws - 5.8.0.1016.18 o linux-image-azure - 5.8.0.1015.15 o linux-image-gcp - 5.8.0.1014.14 o linux-image-generic - 5.8.0.33.38 o linux-image-generic-64k - 5.8.0.33.38 o linux-image-generic-lpae - 5.8.0.33.38 o linux-image-gke - 5.8.0.1014.14 o linux-image-kvm - 5.8.0.1013.15 o linux-image-lowlatency - 5.8.0.33.38 o linux-image-oem-20.04 - 5.8.0.33.38 o linux-image-oracle - 5.8.0.1013.13 o linux-image-raspi - 5.8.0.1010.13 o linux-image-raspi-nolpae - 5.8.0.1010.13 o linux-image-virtual - 5.8.0.33.38 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 https://launchpad.net/bugs/1907262 - -------------------------------------------------------------------------------- USN-4658-2: Linux kernel regression 13 December 2020 USN-4658-1 introduced a regression in the Linux kernel. Releases o Ubuntu 20.04 LTS o Ubuntu 18.04 LTS Packages o linux - Linux kernel o linux-aws - Linux kernel for Amazon Web Services (AWS) systems o linux-aws-5.4 - Linux kernel for Amazon Web Services (AWS) systems o linux-azure - Linux kernel for Microsoft Azure Cloud systems o linux-azure-5.4 - Linux kernel for Microsoft Azure cloud systems o linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems o linux-gcp-5.4 - Linux kernel for Google Cloud Platform (GCP) systems o linux-hwe-5.4 - Linux hardware enablement (HWE) kernel o linux-kvm - Linux kernel for cloud environments o linux-oracle - Linux kernel for Oracle Cloud systems o linux-oracle-5.4 - Linux kernel for Oracle Cloud systems o linux-raspi - Linux kernel for Raspberry Pi (V8) systems o linux-raspi-5.4 - Linux kernel for Raspberry Pi (V8) systems Details USN-4658-1 fixed vulnerabilities in the Linux kernel. Unfortunately, that update introduced a regression in the software raid10 driver when used with fstrim that could lead to data corruption. This update fixes the problem. Original advisory 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 o linux-image-5.4.0-1025-raspi - 5.4.0-1025.28 o linux-image-5.4.0-1030-kvm - 5.4.0-1030.31 o linux-image-5.4.0-1032-aws - 5.4.0-1032.33 o linux-image-5.4.0-1032-gcp - 5.4.0-1032.34 o linux-image-5.4.0-1032-oracle - 5.4.0-1032.34 o linux-image-5.4.0-1034-azure - 5.4.0-1034.35 o linux-image-5.4.0-58-generic - 5.4.0-58.64 o linux-image-5.4.0-58-generic-lpae - 5.4.0-58.64 o linux-image-5.4.0-58-lowlatency - 5.4.0-58.64 o linux-image-aws - 5.4.0.1032.33 o linux-image-azure - 5.4.0.1034.32 o linux-image-gcp - 5.4.0.1032.41 o linux-image-generic - 5.4.0.58.61 o linux-image-generic-lpae - 5.4.0.58.61 o linux-image-gke - 5.4.0.1032.41 o linux-image-kvm - 5.4.0.1030.28 o linux-image-lowlatency - 5.4.0.58.61 o linux-image-oem - 5.4.0.58.61 o linux-image-oem-osp1 - 5.4.0.58.61 o linux-image-oracle - 5.4.0.1032.29 o linux-image-raspi - 5.4.0.1025.60 o linux-image-raspi2 - 5.4.0.1025.60 o linux-image-virtual - 5.4.0.58.61 Ubuntu 18.04 o linux-image-5.4.0-1025-raspi - 5.4.0-1025.28~18.04.1 o linux-image-5.4.0-1032-aws - 5.4.0-1032.33~18.04.1 o linux-image-5.4.0-1032-gcp - 5.4.0-1032.34~18.04.1 o linux-image-5.4.0-1033-oracle - 5.4.0-1033.35 o linux-image-5.4.0-1034-azure - 5.4.0-1034.35~18.04.1 o linux-image-5.4.0-58-generic - 5.4.0-58.64~18.04.1 o linux-image-5.4.0-58-generic-lpae - 5.4.0-58.64~18.04.1 o linux-image-5.4.0-58-lowlatency - 5.4.0-58.64~18.04.1 o linux-image-aws - 5.4.0.1032.17 o linux-image-azure - 5.4.0.1034.16 o linux-image-gcp - 5.4.0.1032.20 o linux-image-generic-hwe-18.04 - 5.4.0.58.64~18.04.53 o linux-image-generic-lpae-hwe-18.04 - 5.4.0.58.64~18.04.53 o linux-image-lowlatency-hwe-18.04 - 5.4.0.58.64~18.04.53 o linux-image-oem - 5.4.0.58.64~18.04.53 o linux-image-oem-osp1 - 5.4.0.58.64~18.04.53 o linux-image-oracle - 5.4.0.1033.16 o linux-image-raspi-hwe-18.04 - 5.4.0.1025.29 o linux-image-snapdragon-hwe-18.04 - 5.4.0.58.64~18.04.53 o linux-image-virtual-hwe-18.04 - 5.4.0.58.64~18.04.53 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 https://launchpad.net/bugs/1907262 - -------------------------------------------------------------------------------- USN-4657-1: Linux kernel vulnerabilities 02 December 2020 Several security issues were fixed in the Linux kernel. Releases o Ubuntu 16.04 LTS o Ubuntu 14.04 ESM Packages o linux - Linux kernel o linux-aws - Linux kernel for Amazon Web Services (AWS) systems o linux-kvm - Linux kernel for cloud environments o linux-lts-xenial - Linux hardware enablement kernel from Xenial for Trusty o linux-raspi2 - Linux kernel for Raspberry Pi (V8) systems o linux-snapdragon - Linux kernel for Qualcomm Snapdragon processors Details Elena Petrova discovered that the pin controller device tree implementation in the Linux kernel did not properly handle string references. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2020-0427) 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) Andy Nguyen discovered that the Bluetooth A2MP implementation in the Linux kernel did not properly initialize memory in some situations. A physically proximate remote attacker could use this to expose sensitive information (kernel memory). (CVE-2020-12352) 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 16.04 o linux-image-4.4.0-1084-kvm - 4.4.0-1084.93 o linux-image-4.4.0-1118-aws - 4.4.0-1118.132 o linux-image-4.4.0-1142-raspi2 - 4.4.0-1142.152 o linux-image-4.4.0-1146-snapdragon - 4.4.0-1146.156 o linux-image-4.4.0-197-generic - 4.4.0-197.229 o linux-image-4.4.0-197-generic-lpae - 4.4.0-197.229 o linux-image-4.4.0-197-lowlatency - 4.4.0-197.229 o linux-image-4.4.0-197-powerpc-e500mc - 4.4.0-197.229 o linux-image-4.4.0-197-powerpc-smp - 4.4.0-197.229 o linux-image-4.4.0-197-powerpc64-emb - 4.4.0-197.229 o linux-image-4.4.0-197-powerpc64-smp - 4.4.0-197.229 o linux-image-aws - 4.4.0.1118.123 o linux-image-generic - 4.4.0.197.203 o linux-image-generic-lpae - 4.4.0.197.203 o linux-image-kvm - 4.4.0.1084.82 o linux-image-lowlatency - 4.4.0.197.203 o linux-image-powerpc-e500mc - 4.4.0.197.203 o linux-image-powerpc-smp - 4.4.0.197.203 o linux-image-powerpc64-emb - 4.4.0.197.203 o linux-image-powerpc64-smp - 4.4.0.197.203 o linux-image-raspi2 - 4.4.0.1142.142 o linux-image-snapdragon - 4.4.0.1146.138 o linux-image-virtual - 4.4.0.197.203 Ubuntu 14.04 o linux-image-4.4.0-1082-aws - 4.4.0-1082.86 o linux-image-4.4.0-197-generic - 4.4.0-197.229~14.04.1 o linux-image-4.4.0-197-generic-lpae - 4.4.0-197.229~14.04.1 o linux-image-4.4.0-197-lowlatency - 4.4.0-197.229~14.04.1 o linux-image-4.4.0-197-powerpc-e500mc - 4.4.0-197.229~14.04.1 o linux-image-4.4.0-197-powerpc-smp - 4.4.0-197.229~14.04.1 o linux-image-4.4.0-197-powerpc64-emb - 4.4.0-197.229~14.04.1 o linux-image-4.4.0-197-powerpc64-smp - 4.4.0-197.229~14.04.1 o linux-image-aws - 4.4.0.1082.79 o linux-image-generic-lpae-lts-xenial - 4.4.0.197.172 o linux-image-generic-lts-xenial - 4.4.0.197.172 o linux-image-lowlatency-lts-xenial - 4.4.0.197.172 o linux-image-powerpc-e500mc-lts-xenial - 4.4.0.197.172 o linux-image-powerpc-smp-lts-xenial - 4.4.0.197.172 o linux-image-powerpc64-emb-lts-xenial - 4.4.0.197.172 o linux-image-powerpc64-smp-lts-xenial - 4.4.0.197.172 o linux-image-virtual-lts-xenial - 4.4.0.197.172 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-2020-14351 o CVE-2020-25284 o CVE-2020-25211 o CVE-2020-25705 o CVE-2020-10135 o CVE-2020-0427 o CVE-2020-25645 o CVE-2020-28915 o CVE-2020-4788 o CVE-2020-12352 o CVE-2020-25643 o CVE-2020-14390 Related notices o USN-4591-1 : linux-image-5.4.0-52-lowlatency, linux, linux-image-5.4.0-1022-raspi, linux-image-virtual-hwe-16.04-edge, linux-image-generic-lpae, linux-image-snapdragon, linux-image-snapdragon-hwe-18.04, linux-image-lowlatency-hwe-16.04, linux-image-raspi2, linux-image-raspi-hwe-18.04, linux-image-generic-hwe-16.04-edge, linux-image-lowlatency-hwe-18.04-edge, linux-image-5.4.0-52-generic-lpae, linux-image-4.15.0-122-generic, linux-image-powerpc64-smp, linux-image-generic-lpae-hwe-18.04, linux-image-raspi-hwe-18.04-edge, linux-image-virtual, linux-oem, linux-image-virtual-hwe-18.04, linux-image-4.15.0-1100-oem, linux-image-lowlatency-hwe-16.04-edge, linux-image-generic-hwe-16.04, linux-image-generic-lpae-hwe-16.04, linux-image-raspi2-hwe-18.04-edge, linux-image-4.15.0-122-generic-lpae, linux-image-oem-osp1, linux-image-lowlatency-hwe-18.04, linux-image-generic-hwe-20.04, linux-image-generic-lpae-hwe-16.04-edge, linux-image-raspi2-hwe-18.04, linux-raspi-5.4, linux-hwe-5.4, linux-raspi, linux-image-virtual-hwe-18.04-edge, linux-image-raspi, linux-image-virtual-hwe-16.04, linux-image-oem, linux-image-lowlatency, linux-image-virtual-hwe-20.04, linux-image-4.15.0-122-lowlatency, linux-image-generic-lpae-hwe-18.04-edge, linux-image-lowlatency-hwe-20.04, linux-image-5.4.0-52-generic, linux-snapdragon, linux-image-4.15.0-1090-snapdragon, linux-image-generic-lpae-hwe-20.04, linux-image-generic-hwe-18.04-edge, linux-image-powerpc-e500mc, linux-hwe, linux-image-powerpc-smp, linux-image-powerpc64-emb, linux-image-generic-hwe-18.04, linux-image-generic o USN-4592-1 : linux-image-oem-osp1, linux-raspi2-5.3, linux-image-raspi2-hwe-18.04, linux-oem-osp1, linux-image-5.3.0-1036-raspi2, linux-image-5.0.0-1070-oem-osp1 o USN-4658-1 : linux, linux-azure, linux-image-kvm, linux-image-generic-lpae, linux-image-snapdragon-hwe-18.04, linux-image-5.4.0-1032-azure, linux-image-5.4.0-1030-aws, linux-gcp-5.4, linux-image-5.4.0-1030-gcp, linux-image-gcp, linux-image-generic-lpae-hwe-18.04, linux-image-virtual, linux-image-5.4.0-1030-oracle, linux-image-virtual-hwe-18.04, linux-oracle, linux-image-5.4.0-56-generic, linux-azure-5.4, linux-image-oracle, linux-gcp, linux-image-oem-osp1, linux-kvm, linux-image-lowlatency-hwe-18.04, linux-image-5.4.0-1028-kvm, linux-image-generic-hwe-20.04, linux-hwe-5.4, linux-aws-5.4, linux-image-gke, linux-image-5.4.0-56-generic-lpae, linux-aws, linux-image-lowlatency, linux-image-azure, linux-image-oem, linux-image-virtual-hwe-20.04, linux-image-aws, linux-image-5.4.0-56-lowlatency, linux-image-lowlatency-hwe-20.04, linux-oracle-5.4, linux-image-generic-lpae-hwe-20.04, linux-image-generic-hwe-18.04, linux-image-generic o USN-4659-1 : linux, linux-azure, linux-image-kvm, linux-image-generic-lpae, linux-image-5.8.0-31-generic-lpae, linux-image-5.8.0-1011-oracle, linux-image-5.8.0-31-lowlatency, linux-image-5.8.0-1012-gcp, linux-image-gcp, linux-image-virtual, linux-image-oem-20.04, linux-image-5.8.0-1013-azure, linux-image-5.8.0-31-generic-64k, linux-oracle, linux-image-oracle, linux-gcp, linux-kvm, linux-image-generic-64k, linux-image-5.8.0-1014-aws, linux-raspi, linux-image-gke, linux-image-raspi, linux-aws, linux-image-lowlatency, linux-image-azure, linux-image-5.8.0-31-generic, linux-image-5.8.0-1008-raspi, linux-image-aws, linux-image-5.8.0-1011-kvm, linux-image-5.8.0-1008-raspi-nolpae, linux-image-raspi-nolpae, linux-image-generic - -------------------------------------------------------------------------------- USN-4658-1: Linux kernel vulnerabilities 02 December 2020 Several security issues were fixed in the Linux kernel. Releases o Ubuntu 20.04 LTS o Ubuntu 18.04 LTS Packages o linux - Linux kernel o linux-aws - Linux kernel for Amazon Web Services (AWS) systems o linux-aws-5.4 - Linux kernel for Amazon Web Services (AWS) systems o linux-azure - Linux kernel for Microsoft Azure Cloud systems o linux-azure-5.4 - Linux kernel for Microsoft Azure cloud systems o linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems o linux-gcp-5.4 - Linux kernel for Google Cloud Platform (GCP) systems o linux-hwe-5.4 - Linux hardware enablement (HWE) kernel o linux-kvm - Linux kernel for cloud environments o linux-oracle - Linux kernel for Oracle Cloud systems o 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 o linux-image-5.4.0-1028-kvm - 5.4.0-1028.29 o linux-image-5.4.0-1030-aws - 5.4.0-1030.31 o linux-image-5.4.0-1030-gcp - 5.4.0-1030.32 o linux-image-5.4.0-1030-oracle - 5.4.0-1030.32 o linux-image-5.4.0-1032-azure - 5.4.0-1032.33 o linux-image-5.4.0-56-generic - 5.4.0-56.62 o linux-image-5.4.0-56-generic-lpae - 5.4.0-56.62 o linux-image-5.4.0-56-lowlatency - 5.4.0-56.62 o linux-image-aws - 5.4.0.1030.31 o linux-image-azure - 5.4.0.1032.30 o linux-image-gcp - 5.4.0.1030.38 o linux-image-generic - 5.4.0.56.59 o linux-image-generic-hwe-20.04 - 5.4.0.56.59 o linux-image-generic-lpae - 5.4.0.56.59 o linux-image-generic-lpae-hwe-20.04 - 5.4.0.56.59 o linux-image-gke - 5.4.0.1030.38 o linux-image-kvm - 5.4.0.1028.26 o linux-image-lowlatency - 5.4.0.56.59 o linux-image-lowlatency-hwe-20.04 - 5.4.0.56.59 o linux-image-oem - 5.4.0.56.59 o linux-image-oem-osp1 - 5.4.0.56.59 o linux-image-oracle - 5.4.0.1030.27 o linux-image-virtual - 5.4.0.56.59 o linux-image-virtual-hwe-20.04 - 5.4.0.56.59 Ubuntu 18.04 o linux-image-5.4.0-1030-aws - 5.4.0-1030.31~18.04.1 o linux-image-5.4.0-1030-gcp - 5.4.0-1030.32~18.04.1 o linux-image-5.4.0-1030-oracle - 5.4.0-1030.32~18.04.1 o linux-image-5.4.0-1032-azure - 5.4.0-1032.33~18.04.1 o linux-image-5.4.0-56-generic - 5.4.0-56.62~18.04.1 o linux-image-5.4.0-56-generic-lpae - 5.4.0-56.62~18.04.1 o linux-image-5.4.0-56-lowlatency - 5.4.0-56.62~18.04.1 o linux-image-aws - 5.4.0.1030.15 o linux-image-azure - 5.4.0.1032.14 o linux-image-gcp - 5.4.0.1030.18 o linux-image-generic-hwe-18.04 - 5.4.0.56.62~18.04.50 o linux-image-generic-lpae-hwe-18.04 - 5.4.0.56.62~18.04.50 o linux-image-lowlatency-hwe-18.04 - 5.4.0.56.62~18.04.50 o linux-image-oem-osp1 - 5.4.0.56.62~18.04.50 o linux-image-oracle - 5.4.0.1030.14 o linux-image-snapdragon-hwe-18.04 - 5.4.0.56.62~18.04.50 o 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 o CVE-2020-25643 o CVE-2020-14390 o CVE-2020-10135 o CVE-2020-25284 o CVE-2020-28915 o CVE-2020-4788 o CVE-2020-25211 o CVE-2020-0423 o CVE-2020-14351 o CVE-2020-25645 o CVE-2020-25705 Related notices o USN-4657-1 : linux-image-generic-lpae-lts-xenial, linux-image-generic, linux-image-powerpc-e500mc, linux-image-generic-lts-xenial, linux-image-4.4.0-197-lowlatency, linux-image-4.4.0-1084-kvm, linux-image-powerpc-smp-lts-xenial, linux-image-kvm, linux-lts-xenial, linux-image-powerpc-e500mc-lts-xenial, linux-image-lowlatency-lts-xenial, linux-image-4.4.0-1118-aws, linux-image-4.4.0-1082-aws, linux-image-4.4.0-197-powerpc-e500mc, linux-image-powerpc64-emb, linux-image-4.4.0-197-powerpc-smp, linux-snapdragon, linux-image-raspi2, linux-image-4.4.0-1146-snapdragon, linux-image-4.4.0-197-powerpc64-emb, linux-image-aws, linux-raspi2, linux-image-4.4.0-197-generic, linux, linux-image-4.4.0-197-powerpc64-smp, linux-aws, linux-image-lowlatency, linux-image-powerpc64-smp-lts-xenial, linux-image-powerpc64-emb-lts-xenial, linux-image-powerpc64-smp, linux-image-generic-lpae, linux-image-virtual, linux-image-powerpc-smp, linux-kvm, linux-image-virtual-lts-xenial, linux-image-4.4.0-1142-raspi2, linux-image-4.4.0-197-generic-lpae, linux-image-snapdragon o USN-4659-1 : linux-image-azure, linux-image-5.8.0-1011-kvm, linux-image-generic, linux-image-raspi-nolpae, linux-image-kvm, linux-image-generic-64k, linux-image-5.8.0-31-generic-lpae, linux-image-5.8.0-31-generic-64k, linux-azure, linux-image-oem-20.04, linux-image-raspi, linux-image-5.8.0-1011-oracle, linux-image-gke, linux-image-aws, linux-image-gcp, linux-image-5.8.0-1013-azure, linux, linux-aws, linux-image-lowlatency, linux-image-5.8.0-1012-gcp, linux-image-5.8.0-31-lowlatency, linux-image-5.8.0-1008-raspi, linux-image-generic-lpae, linux-image-virtual, linux-raspi, linux-kvm, linux-image-oracle, linux-image-5.8.0-1014-aws, linux-image-5.8.0-31-generic, linux-oracle, linux-gcp, linux-image-5.8.0-1008-raspi-nolpae - -------------------------------------------------------------------------------- USN-4659-1: Linux kernel vulnerabilities 02 December 2020 Several security issues were fixed in the Linux kernel. Releases o Ubuntu 20.10 Packages 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-kvm - Linux kernel for cloud environments o linux-oracle - Linux kernel for Oracle Cloud systems o linux-raspi - Linux kernel for Raspberry Pi (V8) 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) 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 KVM hypervisor in the Linux kernel did not properly handle interrupts in certain situations. A local attacker in a guest VM could possibly use this to cause a denial of service (host system crash). (CVE-2020-27152) 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 20.10 o linux-image-5.8.0-1008-raspi - 5.8.0-1008.11 o linux-image-5.8.0-1008-raspi-nolpae - 5.8.0-1008.11 o linux-image-5.8.0-1011-kvm - 5.8.0-1011.12 o linux-image-5.8.0-1011-oracle - 5.8.0-1011.11 o linux-image-5.8.0-1012-gcp - 5.8.0-1012.12 o linux-image-5.8.0-1013-azure - 5.8.0-1013.14 o linux-image-5.8.0-1014-aws - 5.8.0-1014.15 o linux-image-5.8.0-31-generic - 5.8.0-31.33 o linux-image-5.8.0-31-generic-64k - 5.8.0-31.33 o linux-image-5.8.0-31-generic-lpae - 5.8.0-31.33 o linux-image-5.8.0-31-lowlatency - 5.8.0-31.33 o linux-image-aws - 5.8.0.1014.16 o linux-image-azure - 5.8.0.1013.13 o linux-image-gcp - 5.8.0.1012.12 o linux-image-generic - 5.8.0.31.36 o linux-image-generic-64k - 5.8.0.31.36 o linux-image-generic-lpae - 5.8.0.31.36 o linux-image-gke - 5.8.0.1012.12 o linux-image-kvm - 5.8.0.1011.12 o linux-image-lowlatency - 5.8.0.31.36 o linux-image-oem-20.04 - 5.8.0.31.36 o linux-image-oracle - 5.8.0.1011.11 o linux-image-raspi - 5.8.0.1008.11 o linux-image-raspi-nolpae - 5.8.0.1008.11 o linux-image-virtual - 5.8.0.31.36 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-2020-28915 o CVE-2020-4788 o CVE-2020-10135 o CVE-2020-25705 o CVE-2020-27152 o CVE-2020-0423 o CVE-2020-14351 Related notices o USN-4657-1 : linux-image-4.4.0-197-powerpc64-emb, linux-image-raspi2, linux-image-aws, linux-image-lowlatency, linux-image-4.4.0-197-powerpc64-smp, linux-image-powerpc64-smp-lts-xenial, linux-image-virtual, linux-snapdragon, linux-image-lowlatency-lts-xenial, linux-image-4.4.0-1084-kvm, linux-image-powerpc-smp-lts-xenial, linux-image-powerpc64-emb, linux-image-4.4.0-1082-aws, linux-raspi2, linux-image-4.4.0-197-generic-lpae, linux-image-powerpc64-emb-lts-xenial, linux-image-4.4.0-1118-aws, linux-image-powerpc64-smp, linux-image-virtual-lts-xenial, linux, linux-image-powerpc-e500mc, linux-image-generic-lts-xenial, linux-image-4.4.0-1142-raspi2, linux-image-kvm, linux-aws, linux-image-generic, linux-image-powerpc-smp, linux-image-4.4.0-197-powerpc-e500mc, linux-image-4.4.0-197-generic, linux-image-4.4.0-197-powerpc-smp, linux-image-4.4.0-197-lowlatency, linux-image-4.4.0-1146-snapdragon, linux-image-powerpc-e500mc-lts-xenial, linux-image-generic-lpae-lts-xenial, linux-kvm, linux-image-generic-lpae, linux-lts-xenial, linux-image-snapdragon o USN-4658-1 : linux-gcp, linux-image-5.4.0-1032-azure, linux-image-aws, linux-image-azure, linux-image-virtual-hwe-18.04, linux-image-lowlatency, linux-image-generic-lpae-hwe-18.04, linux-aws-5.4, linux-image-5.4.0-1030-aws, linux-image-generic-hwe-20.04, linux-image-virtual, linux-image-generic-lpae-hwe-20.04, linux-image-5.4.0-56-generic-lpae, linux-image-5.4.0-56-generic, linux-oracle, linux-image-5.4.0-1030-oracle, linux-image-oem-osp1, linux-image-5.4.0-1030-gcp, linux-image-virtual-hwe-20.04, linux, linux-azure-5.4, linux-image-kvm, linux-azure, linux-image-generic-hwe-18.04, linux-aws, linux-image-oem, linux-image-generic, linux-image-lowlatency-hwe-18.04, linux-image-5.4.0-1028-kvm, linux-image-oracle, linux-oracle-5.4, linux-hwe-5.4, linux-image-snapdragon-hwe-18.04, linux-kvm, linux-image-generic-lpae, linux-gcp-5.4, linux-image-lowlatency-hwe-20.04, linux-image-gcp, linux-image-gke, linux-image-5.4.0-56-lowlatency - --------------------------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 iQIVAwUBX9bFH+NLKJtyKPYoAQjNOxAAm4hC8TAewQaxedCs97tXvQYoi7+kmrY4 FQRPOAPx6+jN+eZN8hJkdBP7j00rxqjKyBX4gerrx/fU4LtTISZHKirzi8ov6/3v BFQ93ZH08ShidCoWg/Gv7qEk41sFbWEuV3SUlJSVfmcB8B16rmTiiA85AC4GVovJ /UWacnh4gVePIkHlPUikcCv/QtBHVQoBQ0zTrhE/fffLZYvvbf2cWI7cH1AOo2Xd OBF0Av5XoCNK4lXexDE2RJBNTuC5ZPXb72bhObjGMvjHtzlgD6guL/AetW4E5AQ7 JZs/B0XSlMiUA6VtHXz2hmkjP0up7QzA6wYN/K6ToGW5kAv1WfZre4YzORV0pmr6 9bD2NDlMqw6zx5UpTAGIIt5C0DNvuwwJWvu2iM3PXXj7RzTV/WZYMTVe//XZt/Jp JwoOQTrDCB+1noHFCPcQgqRer/zOv/bJ/S48+vP/iIfmtHsLZ+/mFw10EGj0kMDa /gCrt0L26emWNlk9aJ99jU+Ys0T2rF9icuz+e3ZS8yqREa0NgklFlnr6PGDNgX0m w0ezYt35iJqovrBkodOCyuAx1IX2U5PGupACjYqRCuJ41qRgowATqcSMaKqLNuMQ HeurwJ0Jem5bbU5XaGj2PBpFt6IshbgXEKPzIJx4R5RgzrmwBpp+tyQ+iw/+H9hM 2F2CsiCtbzs= =M3MB -----END PGP SIGNATURE-----