Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2020.4284 USN-4660-1: Linux kernel vulnerabilities 4 December 2020 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Linux Kernel Publisher: Ubuntu Operating System: Ubuntu Impact/Access: Execute Arbitrary Code/Commands -- Existing Account Increased Privileges -- Existing Account Denial of Service -- Existing Account Access Privileged Data -- Existing Account Access Confidential Data -- Existing Account Unauthorised Access -- Existing Account Reduced Security -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2020-28915 CVE-2020-25645 CVE-2020-25643 CVE-2020-25641 CVE-2020-25285 CVE-2020-25284 CVE-2020-25211 CVE-2020-14390 CVE-2020-14351 CVE-2020-4788 Reference: ESB-2020.4168 ESB-2020.4059 ESB-2020.3936 Original Bulletin: https://ubuntu.com/security/notices/USN-4660-1 - --------------------------BEGIN INCLUDED TEXT-------------------- USN-4660-1: Linux kernel vulnerabilities 03 December 2020 Several security issues were fixed in the Linux kernel. Releases o Ubuntu 18.04 LTS 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-aws-hwe - Linux kernel for Amazon Web Services (AWS-HWE) systems o linux-azure - Linux kernel for Microsoft Azure Cloud systems o linux-azure-4.15 - Linux kernel for Microsoft Azure Cloud systems o linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems o linux-gcp-4.15 - Linux kernel for Google Cloud Platform (GCP) systems o linux-gke-4.15 - Linux kernel for Google Container Engine (GKE) systems o linux-hwe - Linux hardware enablement (HWE) kernel o linux-kvm - Linux kernel for cloud environments o linux-oem - Linux kernel for OEM systems o linux-oracle - Linux kernel for Oracle Cloud systems o linux-raspi2 - Linux kernel for Raspberry Pi (V8) systems o linux-snapdragon - Linux kernel for Qualcomm Snapdragon processors Details 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 a race condition existed in the hugetlb sysctl implementation in the Linux kernel. A privileged attacker could use this to cause a denial of service (system crash). (CVE-2020-25285) It was discovered that the block layer subsystem in the Linux kernel did not properly handle zero-length requests. A local attacker could use this to cause a denial of service. (CVE-2020-25641) 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) 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 18.04 o linux-image-4.15.0-1059-oracle - 4.15.0-1059.65 o linux-image-4.15.0-1074-gke - 4.15.0-1074.79 o linux-image-4.15.0-1074-raspi2 - 4.15.0-1074.79 o linux-image-4.15.0-1079-kvm - 4.15.0-1079.81 o linux-image-4.15.0-1088-aws - 4.15.0-1088.93 o linux-image-4.15.0-1088-gcp - 4.15.0-1088.101 o linux-image-4.15.0-1091-snapdragon - 4.15.0-1091.100 o linux-image-4.15.0-1100-azure - 4.15.0-1100.111 o linux-image-4.15.0-1103-oem - 4.15.0-1103.114 o linux-image-4.15.0-126-generic - 4.15.0-126.129 o linux-image-4.15.0-126-generic-lpae - 4.15.0-126.129 o linux-image-4.15.0-126-lowlatency - 4.15.0-126.129 o linux-image-aws-lts-18.04 - 4.15.0.1088.90 o linux-image-azure-lts-18.04 - 4.15.0.1100.73 o linux-image-gcp-lts-18.04 - 4.15.0.1088.106 o linux-image-generic - 4.15.0.126.113 o linux-image-generic-lpae - 4.15.0.126.113 o linux-image-gke - 4.15.0.1074.78 o linux-image-gke-4.15 - 4.15.0.1074.78 o linux-image-kvm - 4.15.0.1079.75 o linux-image-lowlatency - 4.15.0.126.113 o linux-image-oem - 4.15.0.1103.107 o linux-image-oracle-lts-18.04 - 4.15.0.1059.69 o linux-image-powerpc-e500mc - 4.15.0.126.113 o linux-image-powerpc-smp - 4.15.0.126.113 o linux-image-powerpc64-emb - 4.15.0.126.113 o linux-image-powerpc64-smp - 4.15.0.126.113 o linux-image-raspi2 - 4.15.0.1074.71 o linux-image-snapdragon - 4.15.0.1091.94 o linux-image-virtual - 4.15.0.126.113 Ubuntu 16.04 o linux-image-4.15.0-1059-oracle - 4.15.0-1059.65~16.04.1 o linux-image-4.15.0-1088-aws - 4.15.0-1088.93~16.04.1 o linux-image-4.15.0-1088-gcp - 4.15.0-1088.101~16.04.1 o linux-image-4.15.0-1100-azure - 4.15.0-1100.111~16.04.1 o linux-image-4.15.0-126-generic - 4.15.0-126.129~16.04.1 o linux-image-4.15.0-126-generic-lpae - 4.15.0-126.129~16.04.1 o linux-image-4.15.0-126-lowlatency - 4.15.0-126.129~16.04.1 o linux-image-aws-hwe - 4.15.0.1088.82 o linux-image-azure - 4.15.0.1100.93 o linux-image-azure-edge - 4.15.0.1100.93 o linux-image-gcp - 4.15.0.1088.89 o linux-image-generic-hwe-16.04 - 4.15.0.126.125 o linux-image-generic-lpae-hwe-16.04 - 4.15.0.126.125 o linux-image-gke - 4.15.0.1088.89 o linux-image-lowlatency-hwe-16.04 - 4.15.0.126.125 o linux-image-oem - 4.15.0.126.125 o linux-image-oracle - 4.15.0.1059.48 o linux-image-virtual-hwe-16.04 - 4.15.0.126.125 Ubuntu 14.04 o linux-image-4.15.0-1100-azure - 4.15.0-1100.111~14.04.1 o linux-image-azure - 4.15.0.1100.75 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-2020-25643 o CVE-2020-25284 o CVE-2020-25285 o CVE-2020-25645 o CVE-2020-28915 o CVE-2020-4788 o CVE-2020-25211 o CVE-2020-14390 o CVE-2020-25641 Related notices o USN-4576-1 : linux-image-raspi2, linux-image-raspi, linux-gcp, linux-image-virtual-hwe-18.04, linux-image-5.4.0-51-generic, linux-hwe-5.4, linux-raspi-5.4, linux-image-azure, linux-image-kvm, linux-image-generic-lpae, linux-image-oracle, linux-image-oem-osp1, linux-image-generic-lpae-hwe-20.04, linux-image-5.4.0-1021-raspi, linux-image-generic-hwe-18.04, linux-image-5.4.0-51-lowlatency, linux-image-generic-lpae-hwe-18.04, linux-image-aws, linux-image-gke, linux-image-5.4.0-1026-kvm, linux-image-gcp, linux-oracle, linux-image-lowlatency-hwe-18.04, linux-image-lowlatency, linux-image-generic, linux-image-raspi-hwe-18.04, linux, linux-image-lowlatency-hwe-20.04, linux-raspi, linux-image-5.4.0-1028-aws, linux-aws-5.4, linux-image-generic-hwe-20.04, linux-image-snapdragon-hwe-18.04, linux-image-5.4.0-1028-gcp, linux-image-oem, linux-azure, linux-oracle-5.4, linux-image-virtual, linux-kvm, linux-image-5.4.0-51-generic-lpae, linux-image-5.4.0-1031-azure, linux-gcp-5.4, linux-aws, linux-image-5.4.0-1028-oracle, linux-image-virtual-hwe-20.04, linux-azure-5.4 o USN-4579-1 : linux-image-raspi2, linux-image-4.4.0-1081-aws, linux-lts-xenial, linux-image-kvm, linux-image-generic-lpae, linux-snapdragon, linux-image-lowlatency-lts-xenial, linux-image-4.4.0-193-powerpc-smp, linux-image-powerpc64-smp, linux-image-4.4.0-1082-kvm, linux-image-4.4.0-193-generic-lpae, linux-image-4.4.0-1145-snapdragon, linux-image-aws, linux-image-4.4.0-1117-aws, linux-image-powerpc-smp, linux-image-4.4.0-193-generic, linux-image-4.4.0-193-powerpc64-smp, linux-image-lowlatency, linux-image-4.4.0-193-powerpc64-emb, linux-image-generic, linux, linux-image-4.4.0-193-lowlatency, linux-image-powerpc-e500mc, linux-image-4.4.0-1141-raspi2, linux-image-powerpc64-emb, linux-image-snapdragon, linux-image-generic-lpae-lts-xenial, linux-image-virtual, linux-kvm, linux-raspi2, linux-aws, linux-image-4.4.0-193-powerpc-e500mc, linux-image-virtual-lts-xenial, linux-image-generic-lts-xenial o USN-4657-1 : linux-image-raspi2, linux-lts-xenial, linux-image-4.4.0-197-powerpc-smp, linux-image-kvm, linux-image-generic-lpae, linux-snapdragon, linux-image-powerpc-e500mc-lts-xenial, linux-image-4.4.0-197-lowlatency, linux-image-4.4.0-1142-raspi2, linux-image-4.4.0-197-powerpc-e500mc, linux-image-4.4.0-1146-snapdragon, linux-image-4.4.0-197-powerpc64-emb, linux-image-4.4.0-197-generic, linux-image-powerpc64-smp-lts-xenial, linux-image-powerpc64-smp, linux-image-powerpc64-emb-lts-xenial, linux-image-aws, linux-image-4.4.0-197-generic-lpae, linux-image-powerpc-smp, linux-image-powerpc-smp-lts-xenial, linux-image-4.4.0-197-powerpc64-smp, linux-image-lowlatency, linux-image-generic, linux, linux-image-powerpc-e500mc, linux-image-powerpc64-emb, linux-image-snapdragon, linux-image-generic-lpae-lts-xenial, linux-image-4.4.0-1118-aws, linux-image-4.4.0-1084-kvm, linux-image-4.4.0-1082-aws, linux-image-virtual, linux-kvm, linux-raspi2, linux-aws, linux-image-lowlatency-lts-xenial, linux-image-virtual-lts-xenial, linux-image-generic-lts-xenial o USN-4658-1 : linux-gcp, linux-image-virtual-hwe-18.04, linux-hwe-5.4, linux-image-azure, linux-image-5.4.0-1028-kvm, linux-image-kvm, linux-image-generic-lpae, linux-image-oracle, linux-image-oem-osp1, linux-image-5.4.0-56-generic-lpae, linux-image-generic-lpae-hwe-20.04, linux-image-5.4.0-1030-aws, linux-image-generic-hwe-18.04, linux-image-5.4.0-1030-oracle, linux-image-generic-lpae-hwe-18.04, linux-image-aws, linux-image-gke, linux-image-5.4.0-56-lowlatency, linux-image-gcp, linux-oracle, linux-image-lowlatency-hwe-18.04, linux-image-lowlatency, linux-image-generic, linux-image-5.4.0-1030-gcp, linux, linux-image-lowlatency-hwe-20.04, linux-image-5.4.0-1032-azure, linux-aws-5.4, linux-image-generic-hwe-20.04, linux-image-snapdragon-hwe-18.04, linux-image-oem, linux-azure, linux-oracle-5.4, linux-image-virtual, linux-kvm, linux-image-5.4.0-56-generic, linux-gcp-5.4, linux-aws, linux-image-virtual-hwe-20.04, linux-azure-5.4 o USN-4659-1 : linux-image-raspi, linux-gcp, linux-image-azure, linux-image-kvm, linux-image-generic-lpae, linux-image-5.8.0-31-generic, linux-image-oem-20.04, linux-image-oracle, linux-image-5.8.0-31-generic-64k, linux-image-5.8.0-1008-raspi-nolpae, linux-image-5.8.0-1008-raspi, linux-image-5.8.0-1011-kvm, linux-image-5.8.0-31-generic-lpae, linux-image-raspi-nolpae, linux-image-5.8.0-1013-azure, linux-image-5.8.0-31-lowlatency, linux-image-aws, linux-image-gke, linux-image-generic-64k, linux-image-gcp, linux-oracle, linux-image-lowlatency, linux-image-generic, linux-raspi, linux, linux-image-5.8.0-1012-gcp, linux-azure, linux-image-5.8.0-1011-oracle, linux-image-virtual, linux-kvm, linux-image-5.8.0-1014-aws, linux-aws - --------------------------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 iQIVAwUBX8lzoeNLKJtyKPYoAQgYyA//Z52448WbhqHYl/xHGQk2Szq9SP+QwctV IYt8WLTPuSZhqhCpW5FbdlRClvkokCY0yTIqRxX54pFJCVawyxhL1FjXVrnj/cos NRGi5Qux7i69KNJkgHSe5O7IWFEi8DrVibfzeSH/dRjD175iC8nMvDwQjAc+Xwb2 LunJmuqhPoT0Nyv22/P/+VLUOs1IRJljX4aLk+cL4us6LUskj+cojc6Qw2AO5oyM zdY4X/IQDy0+MipFvT/HApCFMBpDp+zD1p1IBzWSY/RI0JNLyeCDVUr4vV2ZGbmi oFxdYjo0lZpV0v8rgtApdzDaJwyiyyUX1ER5byt8yQZavG5zQEblxxHmQf+NGlTu 9xmCS+0jDPcwkDaB4dNZH+2V1P8BKL+expUWBtPpSeHMG2TrKVsMpnbJydHc84jV Q+kryHFbrbpg/s5To8mC5GDsIs57lgLHx7vNXRePlTAdiSz5VcXSt+9Obt4jgcI9 39rLgZS/1cwMJAXGQTZK3ASG98HpDQp6maFnqP1FNQyWlu8T4PbacETxBAGCXTIn BVY+0HU50L0W38DWKs3b6fCV6Qp4BRWnK5emr48y205w8ehYHxajKh6/cDTgN5eF /r6c/aVjBMxkHcqJi2UuwKNHKazqA7FT2OkCJqEsQGVzzwjmiarXOUg4Ql5F5Lmb CetkkHFMQ1g= =opGf -----END PGP SIGNATURE-----