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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2018.2348.4 Linux kernel vulnerabilities 21 August 2018 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: kernel Publisher: Ubuntu Operating System: Ubuntu Impact/Access: Access Privileged Data -- Existing Account Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2018-5391 CVE-2018-5390 CVE-2018-3646 CVE-2018-3620 CVE-2017-18344 Reference: ESB-2018.2344 ESB-2018.2342 ESB-2018.2335 ESB-2018.2275 Original Bulletin: http://www.ubuntu.com/usn/usn-3740-1 http://www.ubuntu.com/usn/usn-3740-2 http://www.ubuntu.com/usn/usn-3741-1 http://www.ubuntu.com/usn/usn-3741-2 http://www.ubuntu.com/usn/usn-3742-1 http://www.ubuntu.com/usn/usn-3742-2 http://www.ubuntu.com/usn/usn-3741-3 http://www.ubuntu.com/usn/usn-3742-3 Comment: This bulletin contains eight (8) Ubuntu security advisories. Revision History: August 21 2018: Added USN-3742-3 August 20 2018: Added USN-3741-3 August 15 2018: Added USN 3741-2, 3742-1, 3742-2 August 15 2018: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- USN-3740-1: Linux kernel vulnerabilities 14 August 2018 linux, linux-aws, linux-azure, linux-gcp, linux-kvm, linux-oem, linux-raspi2 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 - 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-oem - Linux kernel for OEM processors o linux-raspi2 - Linux kernel for Raspberry Pi 2 Details It was discovered that memory present in the L1 data cache of an Intel CPU core may be exposed to a malicious process that is executing on the CPU core. This vulnerability is also known as L1 Terminal Fault (L1TF). A local attacker in a guest virtual machine could use this to expose sensitive information (memory from other guests or the host OS). (CVE-2018-3646) It was discovered that memory present in the L1 data cache of an Intel CPU core may be exposed to a malicious process that is executing on the CPU core. This vulnerability is also known as L1 Terminal Fault (L1TF). A local attacker could use this to expose sensitive information (memory from the kernel or other processes). (CVE-2018-3620) Juha-Matti Tilli discovered that the IP implementation in the Linux kernel performed algorithmically expensive operations in some situations when handling incoming packet fragments. A remote attacker could use this to cause a denial of service. (CVE-2018-5391) Update instructions The problem can be corrected by updating your system to the following package versions: Ubuntu 18.04 LTS linux-image-4.15.0-1015-oem - 4.15.0.1015.17 linux-image-4.15.0-1017-gcp - 4.15.0-1017.18 linux-image-4.15.0-1019-aws - 4.15.0-1019.19 linux-image-4.15.0-1019-kvm - 4.15.0-1019.19 linux-image-4.15.0-1020-raspi2 - 4.15.0-1020.22 linux-image-4.15.0-1021-azure - 4.15.0.1021.21 linux-image-4.15.0-32-generic - 4.15.0-32.35 linux-image-4.15.0-32-generic-lpae - 4.15.0-32.35 linux-image-4.15.0-32-lowlatency - 4.15.0-32.35 linux-image-4.15.0-32-snapdragon - 4.15.0-32.35 linux-image-aws - 4.15.0.1019.19 linux-image-azure - 4.15.0.1021.21 linux-image-azure-edge - 4.15.0.1021.21 linux-image-gcp - 4.15.0.1017.19 linux-image-generic - 4.15.0.32.34 linux-image-generic-lpae - 4.15.0.32.34 linux-image-gke - 4.15.0.1017.19 linux-image-kvm - 4.15.0.1019.19 linux-image-lowlatency - 4.15.0.32.34 linux-image-oem - 4.15.0.1015.17 linux-image-raspi2 - 4.15.0.1020.18 linux-image-snapdragon - 4.15.0.32.34 To update your system, please follow these instructions: https:// wiki.ubuntu.com/Security/Upgrades. Please note that the recommended mitigation for CVE-2018-3646 involves updating processor microcode in addition to updating the kernel; however, the kernel includes a fallback for processors that have not received microcode updates. 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-2018-3620 o CVE-2018-3646 o CVE-2018-5391 o https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/L1TF (C) 2017 Canonical Ltd. Ubuntu and Canonical are registered trademarks of Canonical Ltd. - ------------------------------------------------------------------------------ USN-3740-2: Linux kernel (HWE) vulnerabilities 14 August 2018 linux-hwe, linux-azure, linux-gcp vulnerabilities A security issue affects these releases of Ubuntu and its derivatives: o Ubuntu 16.04 LTS Summary Several security issues were fixed in the Linux kernel. Software Description o linux-azure - Linux kernel for Microsoft Azure Cloud systems o linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems o linux-hwe - Linux hardware enablement (HWE) kernel Details USN-3740-1 fixed vulnerabilities in the Linux kernel for Ubuntu 18.04 LTS. This update provides the corresponding updates for the Linux Hardware Enablement (HWE) kernel from Ubuntu 18.04 LTS for Ubuntu 16.04 LTS. It was discovered that memory present in the L1 data cache of an Intel CPU core may be exposed to a malicious process that is executing on the CPU core. This vulnerability is also known as L1 Terminal Fault (L1TF). A local attacker in a guest virtual machine could use this to expose sensitive information (memory from other guests or the host OS). (CVE-2018-3646) It was discovered that memory present in the L1 data cache of an Intel CPU core may be exposed to a malicious process that is executing on the CPU core. This vulnerability is also known as L1 Terminal Fault (L1TF). A local attacker could use this to expose sensitive information (memory from the kernel or other processes). (CVE-2018-3620) Juha-Matti Tilli discovered that the IP implementation in the Linux kernel performed algorithmically expensive operations in some situations when handling incoming packet fragments. A remote attacker could use this to cause a denial of service. (CVE-2018-5391) Update instructions The problem can be corrected by updating your system to the following package versions: Ubuntu 16.04 LTS linux-image-4.15.0-1017-gcp - 4.15.0-1017.18~16.04.1 linux-image-4.15.0-1021-azure - 4.15.0-1021.21~16.04.1 linux-image-4.15.0-32-generic - 4.15.0-32.35~16.04.1 linux-image-4.15.0-32-generic-lpae - 4.15.0-32.35~16.04.1 linux-image-4.15.0-32-lowlatency - 4.15.0-32.35~16.04.1 linux-image-azure - 4.15.0.1021.27 linux-image-gcp - 4.15.0.1017.29 linux-image-generic-hwe-16.04 - 4.15.0.32.54 linux-image-generic-lpae-hwe-16.04 - 4.15.0.32.54 linux-image-gke - 4.15.0.1017.29 linux-image-lowlatency-hwe-16.04 - 4.15.0.32.54 linux-image-virtual-hwe-16.04 - 4.15.0.32.54 To update your system, please follow these instructions: https:// wiki.ubuntu.com/Security/Upgrades. Please note that the recommended mitigation for CVE-2018-3646 involves updating processor microcode in addition to updating the kernel; however, the kernel includes a fallback for processors that have not received microcode updates. 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-3740-1 o CVE-2018-3620 o CVE-2018-3646 o CVE-2018-5391 o https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/L1TF (C) 2017 Canonical Ltd. Ubuntu and Canonical are registered trademarks of Canonical Ltd. - ------------------------------------------------------------------------------ USN-3741-1: Linux kernel vulnerabilities 14 August 2018 linux, linux-aws, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities A security issue affects these releases of Ubuntu and its derivatives: o Ubuntu 16.04 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-kvm - Linux kernel for cloud environments o linux-raspi2 - Linux kernel for Raspberry Pi 2 o linux-snapdragon - Linux kernel for Snapdragon processors Details It was discovered that memory present in the L1 data cache of an Intel CPU core may be exposed to a malicious process that is executing on the CPU core. This vulnerability is also known as L1 Terminal Fault (L1TF). A local attacker in a guest virtual machine could use this to expose sensitive information (memory from other guests or the host OS). (CVE-2018-3646) It was discovered that memory present in the L1 data cache of an Intel CPU core may be exposed to a malicious process that is executing on the CPU core. This vulnerability is also known as L1 Terminal Fault (L1TF). A local attacker could use this to expose sensitive information (memory from the kernel or other processes). (CVE-2018-3620) Juha-Matti Tilli discovered that the TCP implementation in the Linux kernel performed algorithmically expensive operations in some situations when handling incoming packets. A remote attacker could use this to cause a denial of service. (CVE-2018-5390) Juha-Matti Tilli discovered that the IP implementation in the Linux kernel performed algorithmically expensive operations in some situations when handling incoming packet fragments. A remote attacker could use this to cause a denial of service. (CVE-2018-5391) Update instructions The problem can be corrected by updating your system to the following package versions: Ubuntu 16.04 LTS linux-image-4.4.0-1031-kvm - 4.4.0-1031.37 linux-image-4.4.0-1065-aws - 4.4.0-1065.75 linux-image-4.4.0-1094-raspi2 - 4.4.0-1094.102 linux-image-4.4.0-1098-snapdragon - 4.4.0-1098.103 linux-image-4.4.0-133-generic - 4.4.0-133.159 linux-image-4.4.0-133-generic-lpae - 4.4.0-133.159 linux-image-4.4.0-133-lowlatency - 4.4.0-133.159 linux-image-4.4.0-133-powerpc-e500mc - 4.4.0-133.159 linux-image-4.4.0-133-powerpc-smp - 4.4.0-133.159 linux-image-4.4.0-133-powerpc64-emb - 4.4.0-133.159 linux-image-4.4.0-133-powerpc64-smp - 4.4.0-133.159 linux-image-aws - 4.4.0.1065.67 linux-image-generic - 4.4.0.133.139 linux-image-generic-lpae - 4.4.0.133.139 linux-image-kvm - 4.4.0.1031.30 linux-image-lowlatency - 4.4.0.133.139 linux-image-powerpc-e500mc - 4.4.0.133.139 linux-image-powerpc-smp - 4.4.0.133.139 linux-image-powerpc64-emb - 4.4.0.133.139 linux-image-powerpc64-smp - 4.4.0.133.139 linux-image-raspi2 - 4.4.0.1094.94 linux-image-snapdragon - 4.4.0.1098.90 To update your system, please follow these instructions: https:// wiki.ubuntu.com/Security/Upgrades. Please note that the recommended mitigation for CVE-2018-3646 involves updating processor microcode in addition to updating the kernel; however, the kernel includes a fallback for processors that have not received microcode updates. 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-2018-3620 o CVE-2018-3646 o CVE-2018-5390 o CVE-2018-5391 o https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/L1TF (C) 2017 Canonical Ltd. Ubuntu and Canonical are registered trademarks of Canonical Ltd. - ------------------------------------------------------------------------------ USN-3741-2: Linux kernel (Xenial HWE) vulnerabilities 14 August 2018 linux-lts-xenial, linux-aws vulnerabilities A security issue affects these releases of Ubuntu and its derivatives: o Ubuntu 14.04 LTS Summary Several security issues were fixed in the Linux kernel. Software Description o linux-aws - Linux kernel for Amazon Web Services (AWS) systems o linux-lts-xenial - Linux hardware enablement kernel from Xenial for Trusty Details USN-3741-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04 LTS. This update provides the corresponding updates for the Linux Hardware Enablement (HWE) kernel from Ubuntu 16.04 LTS for Ubuntu 14.04 LTS. It was discovered that memory present in the L1 data cache of an Intel CPU core may be exposed to a malicious process that is executing on the CPU core. This vulnerability is also known as L1 Terminal Fault (L1TF). A local attacker in a guest virtual machine could use this to expose sensitive information (memory from other guests or the host OS). (CVE-2018-3646) It was discovered that memory present in the L1 data cache of an Intel CPU core may be exposed to a malicious process that is executing on the CPU core. This vulnerability is also known as L1 Terminal Fault (L1TF). A local attacker could use this to expose sensitive information (memory from the kernel or other processes). (CVE-2018-3620) Juha-Matti Tilli discovered that the TCP implementation in the Linux kernel performed algorithmically expensive operations in some situations when handling incoming packets. A remote attacker could use this to cause a denial of service. (CVE-2018-5390) Juha-Matti Tilli discovered that the IP implementation in the Linux kernel performed algorithmically expensive operations in some situations when handling incoming packet fragments. A remote attacker could use this to cause a denial of service. (CVE-2018-5391) Update instructions The problem can be corrected by updating your system to the following package versions: Ubuntu 14.04 LTS linux-image-4.4.0-1027-aws - 4.4.0-1027.30 linux-image-4.4.0-133-generic - 4.4.0-133.159~14.04.1 linux-image-4.4.0-133-generic-lpae - 4.4.0-133.159~14.04.1 linux-image-4.4.0-133-lowlatency - 4.4.0-133.159~14.04.1 linux-image-4.4.0-133-powerpc-e500mc - 4.4.0-133.159~14.04.1 linux-image-4.4.0-133-powerpc-smp - 4.4.0-133.159~14.04.1 linux-image-4.4.0-133-powerpc64-emb - 4.4.0-133.159~14.04.1 linux-image-4.4.0-133-powerpc64-smp - 4.4.0-133.159~14.04.1 linux-image-aws - 4.4.0.1027.27 linux-image-generic-lpae-lts-xenial - 4.4.0.133.113 linux-image-generic-lts-xenial - 4.4.0.133.113 linux-image-lowlatency-lts-xenial - 4.4.0.133.113 linux-image-powerpc-e500mc-lts-xenial - 4.4.0.133.113 linux-image-powerpc-smp-lts-xenial - 4.4.0.133.113 linux-image-powerpc64-emb-lts-xenial - 4.4.0.133.113 linux-image-powerpc64-smp-lts-xenial - 4.4.0.133.113 To update your system, please follow these instructions: https:// wiki.ubuntu.com/Security/Upgrades. Please note that the recommended mitigation for CVE-2018-3646 involves updating processor microcode in addition to updating the kernel; however, the kernel includes a fallback for processors that have not received microcode updates. 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-3741-1 o CVE-2018-3620 o CVE-2018-3646 o CVE-2018-5390 o CVE-2018-5391 o https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/L1TF (C) 2017 Canonical Ltd. Ubuntu and Canonical are registered trademarks of Canonical Ltd. - ------------------------------------------------------------------------------ USN-3742-1: Linux kernel vulnerabilities 14 August 2018 linux vulnerabilities A security issue affects these releases of Ubuntu and its derivatives: o Ubuntu 14.04 LTS Summary Several security issues were fixed in the Linux kernel. Software Description o linux - Linux kernel Details It was discovered that memory present in the L1 data cache of an Intel CPU core may be exposed to a malicious process that is executing on the CPU core. This vulnerability is also known as L1 Terminal Fault (L1TF). A local attacker in a guest virtual machine could use this to expose sensitive information (memory from other guests or the host OS). (CVE-2018-3646) It was discovered that memory present in the L1 data cache of an Intel CPU core may be exposed to a malicious process that is executing on the CPU core. This vulnerability is also known as L1 Terminal Fault (L1TF). A local attacker could use this to expose sensitive information (memory from the kernel or other processes). (CVE-2018-3620) Andrey Konovalov discovered an out-of-bounds read in the POSIX timers subsystem in the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or expose sensitive information. (CVE-2017-18344) Juha-Matti Tilli discovered that the TCP implementation in the Linux kernel performed algorithmically expensive operations in some situations when handling incoming packets. A remote attacker could use this to cause a denial of service. (CVE-2018-5390) Juha-Matti Tilli discovered that the IP implementation in the Linux kernel performed algorithmically expensive operations in some situations when handling incoming packet fragments. A remote attacker could use this to cause a denial of service. (CVE-2018-5391) Update instructions The problem can be corrected by updating your system to the following package versions: Ubuntu 14.04 LTS linux-image-3.13.0-155-generic - 3.13.0-155.205 linux-image-3.13.0-155-generic-lpae - 3.13.0-155.205 linux-image-3.13.0-155-lowlatency - 3.13.0-155.205 linux-image-3.13.0-155-powerpc-e500 - 3.13.0-155.205 linux-image-3.13.0-155-powerpc-e500mc - 3.13.0-155.205 linux-image-3.13.0-155-powerpc-smp - 3.13.0-155.205 linux-image-3.13.0-155-powerpc64-emb - 3.13.0-155.205 linux-image-3.13.0-155-powerpc64-smp - 3.13.0-155.205 linux-image-generic - 3.13.0.155.165 linux-image-generic-lpae - 3.13.0.155.165 linux-image-lowlatency - 3.13.0.155.165 linux-image-powerpc-e500 - 3.13.0.155.165 linux-image-powerpc-e500mc - 3.13.0.155.165 linux-image-powerpc-smp - 3.13.0.155.165 linux-image-powerpc64-emb - 3.13.0.155.165 linux-image-powerpc64-smp - 3.13.0.155.165 To update your system, please follow these instructions: https:// wiki.ubuntu.com/Security/Upgrades. Please note that the recommended mitigation for CVE-2018-3646 involves updating processor microcode in addition to updating the kernel; however, the kernel includes a fallback for processors that have not received microcode updates. 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-2017-18344 o CVE-2018-3620 o CVE-2018-3646 o CVE-2018-5390 o CVE-2018-5391 o https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/L1TF (C) 2017 Canonical Ltd. Ubuntu and Canonical are registered trademarks of Canonical Ltd. - ------------------------------------------------------------------------------ USN-3742-2: Linux kernel (Trusty HWE) vulnerabilities 14 August 2018 linux-lts-trusty vulnerabilities A security issue affects these releases of Ubuntu and its derivatives: o Ubuntu 12.04 ESM Summary Several security issues were fixed in the Linux kernel. Software Description o linux-lts-trusty - Linux hardware enablement kernel from Trusty for Precise ESM Details USN-3742-1 fixed vulnerabilities in the Linux kernel for Ubuntu 14.04 LTS. This update provides the corresponding updates for the Linux Hardware Enablement (HWE) kernel from Ubuntu 14.04 for Ubuntu 12.04 ESM. It was discovered that memory present in the L1 data cache of an Intel CPU core may be exposed to a malicious process that is executing on the CPU core. This vulnerability is also known as L1 Terminal Fault (L1TF). A local attacker in a guest virtual machine could use this to expose sensitive information (memory from other guests or the host OS). (CVE-2018-3646) It was discovered that memory present in the L1 data cache of an Intel CPU core may be exposed to a malicious process that is executing on the CPU core. This vulnerability is also known as L1 Terminal Fault (L1TF). A local attacker could use this to expose sensitive information (memory from the kernel or other processes). (CVE-2018-3620) Andrey Konovalov discovered an out-of-bounds read in the POSIX timers subsystem in the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or expose sensitive information. (CVE-2017-18344) Juha-Matti Tilli discovered that the TCP implementation in the Linux kernel performed algorithmically expensive operations in some situations when handling incoming packets. A remote attacker could use this to cause a denial of service. (CVE-2018-5390) Juha-Matti Tilli discovered that the IP implementation in the Linux kernel performed algorithmically expensive operations in some situations when handling incoming packet fragments. A remote attacker could use this to cause a denial of service. (CVE-2018-5391) Update instructions The problem can be corrected by updating your system to the following package versions: Ubuntu 12.04 ESM linux-image-3.13.0-155-generic - 3.13.0-155.206~precise1 linux-image-3.13.0-155-generic-lpae - 3.13.0-155.206~precise1 linux-image-generic-lpae-lts-trusty - 3.13.0.155.145 linux-image-generic-lts-trusty - 3.13.0.155.145 To update your system, please follow these instructions: https:// wiki.ubuntu.com/Security/Upgrades. Please note that the recommended mitigation for CVE-2018-3646 involves updating processor microcode in addition to updating the kernel; however, the kernel includes a fallback for processors that have not received microcode updates. 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-3742-1 o CVE-2017-18344 o CVE-2018-3620 o CVE-2018-3646 o CVE-2018-5390 o CVE-2018-5391 o https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/L1TF (C) 2017 Canonical Ltd. Ubuntu and Canonical are registered trademarks of Canonical Ltd. - ------------------------------------------------------------------------------ USN-3741-3: linux regressions August 17, 2018 A security issue affects these releases of Ubuntu and its derivatives: - - Ubuntu 14.04 LTS Summary: Several security issues were fixed in the Linux kernel. Software Description: - - linux: Linux kernel Details: USN-3741-1 introduced mitigations in the Linux kernel for Ubuntu 14.04 LTS to address L1 Terminal Fault (L1TF) vulnerabilities (CVE-2018-3620, CVE-2018-3646). Unfortunately, the update introduced regressions that caused kernel panics when booting in some environments as well as preventing Java applications from starting. This update fixes the problems. We apologize for the inconvenience. Original advisory details: It was discovered that memory present in the L1 data cache of an Intel CPU core may be exposed to a malicious process that is executing on the CPU core. This vulnerability is also known as L1 Terminal Fault (L1TF). A local attacker in a guest virtual machine could use this to expose sensitive information (memory from other guests or the host OS). (CVE-2018-3646) It was discovered that memory present in the L1 data cache of an Intel CPU core may be exposed to a malicious process that is executing on the CPU core. This vulnerability is also known as L1 Terminal Fault (L1TF). A local attacker could use this to expose sensitive information (memory from the kernel or other processes). (CVE-2018-3620) Juha-Matti Tilli discovered that the TCP implementation in the Linux kernel performed algorithmically expensive operations in some situations when handling incoming packets. A remote attacker could use this to cause a denial of service. (CVE-2018-5390) Juha-Matti Tilli discovered that the IP implementation in the Linux kernel performed algorithmically expensive operations in some situations when handling incoming packet fragments. A remote attacker could use this to cause a denial of service. (CVE-2018-5391) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 14.04 LTS: linux-image-3.13.0-156-generic 3.13.0-156.206 linux-image-3.13.0-156-generic-lpae 3.13.0-156.206 linux-image-3.13.0-156-lowlatency 3.13.0-156.206 linux-image-3.13.0-156-powerpc-e500 3.13.0-156.206 linux-image-3.13.0-156-powerpc-e500mc 3.13.0-156.206 linux-image-3.13.0-156-powerpc-smp 3.13.0-156.206 linux-image-3.13.0-156-powerpc64-emb 3.13.0-156.206 linux-image-3.13.0-156-powerpc64-smp 3.13.0-156.206 linux-image-generic 3.13.0.156.166 linux-image-generic-lpae 3.13.0.156.166 linux-image-lowlatency 3.13.0.156.166 linux-image-powerpc-e500 3.13.0.156.166 linux-image-powerpc-e500mc 3.13.0.156.166 linux-image-powerpc-smp 3.13.0.156.166 linux-image-powerpc64-emb 3.13.0.156.166 linux-image-powerpc64-smp 3.13.0.156.166 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/usn/usn-3741-3 https://usn.ubuntu.com/usn/usn-3741-1 https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1787127, https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1787258 Package Information: https://launchpad.net/ubuntu/+source/linux/3.13.0-156.206 - ------------------------------------------------------------------------------ USN-3742-3: linux-lts-trusty regressions August 21, 2018 A security issue affects these releases of Ubuntu and its derivatives: - - Ubuntu 12.04 ESM Summary: USN-3742-2 introduced regressions in the Linux Hardware Enablement (HWE) kernel for Ubuntu 12.04 ESM. Software Description: - - linux-lts-trusty: Linux hardware enablement kernel from Trusty for Precise ESM Details: USN-3742-2 introduced mitigations in the Linux Hardware Enablement (HWE) kernel for Ubuntu 12.04 ESM to address L1 Terminal Fault (L1TF) vulnerabilities (CVE-2018-3620, CVE-2018-3646). Unfortunately, the update introduced regressions that caused kernel panics when booting in some environments as well as preventing Java applications from starting. This update fixes the problems. We apologize for the inconvenience. Original advisory details: It was discovered that memory present in the L1 data cache of an Intel CPU core may be exposed to a malicious process that is executing on the CPU core. This vulnerability is also known as L1 Terminal Fault (L1TF). A local attacker in a guest virtual machine could use this to expose sensitive information (memory from other guests or the host OS). (CVE-2018-3646) It was discovered that memory present in the L1 data cache of an Intel CPU core may be exposed to a malicious process that is executing on the CPU core. This vulnerability is also known as L1 Terminal Fault (L1TF). A local attacker could use this to expose sensitive information (memory from the kernel or other processes). (CVE-2018-3620) Andrey Konovalov discovered an out-of-bounds read in the POSIX timers subsystem in the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or expose sensitive information. (CVE-2017-18344) Juha-Matti Tilli discovered that the TCP implementation in the Linux kernel performed algorithmically expensive operations in some situations when handling incoming packets. A remote attacker could use this to cause a denial of service. (CVE-2018-5390) Juha-Matti Tilli discovered that the IP implementation in the Linux kernel performed algorithmically expensive operations in some situations when handling incoming packet fragments. A remote attacker could use this to cause a denial of service. (CVE-2018-5391) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 12.04 ESM: linux-image-3.13.0-156-generic 3.13.0-156.206~precise1 linux-image-3.13.0-156-generic-lpae 3.13.0-156.206~precise1 linux-image-generic-lpae-lts-trusty 3.13.0.156.146 linux-image-generic-lts-trusty 3.13.0.156.146 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/usn/usn-3742-3 https://usn.ubuntu.com/usn/usn-3742-2 https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1787127 https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1787258 https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/L1TF - --------------------------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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