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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2018.1915.2 Linux kernel vulnerabilities 24 July 2018 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: linux linux-aws linux-azure linux-gcp linux-kvm linux-oem linux-raspi2 Publisher: Ubuntu Operating System: Ubuntu Impact/Access: Access Privileged Data -- Console/Physical Denial of Service -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2018-11508 CVE-2018-10940 CVE-2018-7755 CVE-2018-1095 CVE-2018-1094 Reference: ESB-2018.1736 ESB-2018.1663 Original Bulletin: http://www.ubuntu.com/usn/usn-3718-1 http://www.ubuntu.com/usn/usn-3718-2 http://www.ubuntu.com/usn/usn-3695-1 http://www.ubuntu.com/usn/usn-3695-2 Comment: This bulletin contains four (4) Ubuntu security advisories. This advisory references vulnerabilities in the Linux kernel that also affect distributions other than Ubuntu. It is recommended that administrators running Linux check for an updated version of the kernel for their system. CVE-2018-1094, CVE-2018-1095, CVE-2018-11508 and CVE-2018-7755 are all new, but CVE-2018-10940 is present in the referenced bulletins. Revision History: July 24 2018: Update released that fixes a regression in initial patch. July 3 2018: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- ========================================================================== Ubuntu Security Notice USN-3718-1 July 21, 2018 linux, linux-aws, linux-azure, linux-gcp, linux-kvm, linux-oem regression ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - - Ubuntu 18.04 LTS Summary: A regression that caused boot failures was 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-oem: Linux kernel for OEM processors Details: USN-3695-1 fixed vulnerabilities in the Linux kernel for Ubuntu 18.04 LTS. Unfortunately, the fix for CVE-2018-1108 introduced a regression where insufficient early entropy prevented services from starting, leading in some situations to a failure to boot, This update addresses the issue. We apologize for the inconvenience. Original advisory details: Jann Horn discovered that the Linux kernel's implementation of random seed data reported that it was in a ready state before it had gathered sufficient entropy. An attacker could use this to expose sensitive information. (CVE-2018-1108) Wen Xu discovered that the ext4 file system implementation in the Linux kernel did not properly initialize the crc32c checksum driver. A local attacker could use this to cause a denial of service (system crash). (CVE-2018-1094) It was discovered that the cdrom driver in the Linux kernel contained an incorrect bounds check. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2018-10940) Wen Xu discovered that the ext4 file system implementation in the Linux kernel did not properly validate xattr sizes. A local attacker could use this to cause a denial of service (system crash). (CVE-2018-1095) Jann Horn discovered that the 32 bit adjtimex() syscall implementation for 64 bit Linux kernels did not properly initialize memory returned to user space in some situations. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2018-11508) It was discovered that an information leak vulnerability existed in the floppy driver in the Linux kernel. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2018-7755) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 18.04 LTS: linux-image-4.15.0-1014-gcp 4.15.0-1014.14 linux-image-4.15.0-1016-aws 4.15.0-1016.16 linux-image-4.15.0-1016-kvm 4.15.0-1016.16 linux-image-4.15.0-1018-azure 4.15.0-1018.18 linux-image-4.15.0-29-generic 4.15.0-29.31 linux-image-4.15.0-29-generic-lpae 4.15.0-29.31 linux-image-4.15.0-29-lowlatency 4.15.0-29.31 linux-image-4.15.0-29-snapdragon 4.15.0-29.31 linux-image-aws 4.15.0.1016.16 linux-image-azure 4.15.0.1018.18 linux-image-gcp 4.15.0.1014.16 linux-image-generic 4.15.0.29.31 linux-image-generic-lpae 4.15.0.29.31 linux-image-gke 4.15.0.1014.16 linux-image-kvm 4.15.0.1016.16 linux-image-lowlatency 4.15.0.29.31 linux-image-oem 4.15.0.1012.14 linux-image-snapdragon 4.15.0.29.31 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-3718-1 https://launchpad.net/bugs/1779827, https://usn.ubuntu.com/usn/usn-3695-1 Package Information: https://launchpad.net/ubuntu/+source/linux/4.15.0-29.31 https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1016.16 https://launchpad.net/ubuntu/+source/linux-azure/4.15.0-1018.18 https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1014.14 https://launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1016.16 https://launchpad.net/ubuntu/+source/linux-oem/4.15.0-1012.15 - ------------------------------------------------------------------------------- ========================================================================== Ubuntu Security Notice USN-3718-2 July 21, 2018 linux-hwe, linux-azure, linux-gcp regression ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - - Ubuntu 16.04 LTS Summary: A regression that caused boot failures was fixed in the Linux kernel. Software Description: - - linux-azure: Linux kernel for Microsoft Azure Cloud systems - - linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems - - linux-hwe: Linux hardware enablement (HWE) kernel Details: USN-3695-2 fixed vulnerabilities in the Linux Hardware Enablement Kernel (HWE) kernel for Ubuntu 16.04 LTS. Unfortunately, the fix for CVE-2018-1108 introduced a regression where insufficient early entropy prevented services from starting, leading in some situations to a failure to boot, This update addresses the issue. We apologize for the inconvenience. Original advisory details: Jann Horn discovered that the Linux kernel's implementation of random seed data reported that it was in a ready state before it had gathered sufficient entropy. An attacker could use this to expose sensitive information. (CVE-2018-1108) Wen Xu discovered that the ext4 file system implementation in the Linux kernel did not properly initialize the crc32c checksum driver. A local attacker could use this to cause a denial of service (system crash). (CVE-2018-1094) It was discovered that the cdrom driver in the Linux kernel contained an incorrect bounds check. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2018-10940) Wen Xu discovered that the ext4 file system implementation in the Linux kernel did not properly validate xattr sizes. A local attacker could use this to cause a denial of service (system crash). (CVE-2018-1095) Jann Horn discovered that the 32 bit adjtimex() syscall implementation for 64 bit Linux kernels did not properly initialize memory returned to user space in some situations. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2018-11508) It was discovered that an information leak vulnerability existed in the floppy driver in the Linux kernel. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2018-7755) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 16.04 LTS: linux-image-4.15.0-1014-gcp 4.15.0-1014.14~16.04.1 linux-image-4.15.0-1018-azure 4.15.0-1018.18~16.04.1 linux-image-4.15.0-29-generic 4.15.0-29.31~16.04.1 linux-image-4.15.0-29-generic-lpae 4.15.0-29.31~16.04.1 linux-image-4.15.0-29-lowlatency 4.15.0-29.31~16.04.1 linux-image-azure 4.15.0.1018.24 linux-image-gcp 4.15.0.1014.26 linux-image-generic-hwe-16.04 4.13.0.45.64 linux-image-generic-lpae-hwe-16.04 4.13.0.45.64 linux-image-gke 4.15.0.1014.26 linux-image-lowlatency-hwe-16.04 4.13.0.45.64 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-3718-2 https://usn.ubuntu.com/usn/usn-3718-1 https://launchpad.net/bugs/1779827, https://usn.ubuntu.com/usn/usn-3695-2 Package Information: https://launchpad.net/ubuntu/+source/linux-azure/4.15.0-1018.18~16.04.1 https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1014.14~16.04.1 https://launchpad.net/ubuntu/+source/linux-hwe/4.15.0-29.31~16.04.1 - ------------------------------------------------------------------------------- ========================================================================== Ubuntu Security Notice USN-3695-1 July 02, 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: - - 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-oem: Linux kernel for OEM processors - - linux-raspi2: Linux kernel for Raspberry Pi 2 Details: Wen Xu discovered that the ext4 file system implementation in the Linux kernel did not properly initialize the crc32c checksum driver. A local attacker could use this to cause a denial of service (system crash). (CVE-2018-1094) It was discovered that the cdrom driver in the Linux kernel contained an incorrect bounds check. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2018-10940) Wen Xu discovered that the ext4 file system implementation in the Linux kernel did not properly validate xattr sizes. A local attacker could use this to cause a denial of service (system crash). (CVE-2018-1095) Jann Horn discovered that the 32 bit adjtimex() syscall implementation for 64 bit Linux kernels did not properly initialize memory returned to user space in some situations. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2018-11508) It was discovered that an information leak vulnerability existed in the floppy driver in the Linux kernel. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2018-7755) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 18.04 LTS: linux-image-4.15.0-1010-gcp 4.15.0-1010.10 linux-image-4.15.0-1011-aws 4.15.0-1011.11 linux-image-4.15.0-1012-kvm 4.15.0-1012.12 linux-image-4.15.0-1013-raspi2 4.15.0-1013.14 linux-image-4.15.0-1014-azure 4.15.0-1014.14 linux-image-4.15.0-24-generic 4.15.0-24.26 linux-image-4.15.0-24-generic-lpae 4.15.0-24.26 linux-image-4.15.0-24-lowlatency 4.15.0-24.26 linux-image-4.15.0-24-snapdragon 4.15.0-24.26 linux-image-aws 4.15.0.1011.11 linux-image-azure 4.15.0.1014.14 linux-image-gcp 4.15.0.1010.12 linux-image-generic 4.15.0.24.26 linux-image-generic-lpae 4.15.0.24.26 linux-image-gke 4.15.0.1010.12 linux-image-kvm 4.15.0.1012.12 linux-image-lowlatency 4.15.0.24.26 linux-image-oem 4.15.0.1009.11 linux-image-raspi2 4.15.0.1013.11 linux-image-snapdragon 4.15.0.24.26 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-3695-1 CVE-2018-1094, CVE-2018-10940, CVE-2018-1095, CVE-2018-11508, CVE-2018-7755 Package Information: https://launchpad.net/ubuntu/+source/linux/4.15.0-24.26 https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1011.11 https://launchpad.net/ubuntu/+source/linux-azure/4.15.0-1014.14 https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1010.10 https://launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1012.12 https://launchpad.net/ubuntu/+source/linux-oem/4.15.0-1009.12 https://launchpad.net/ubuntu/+source/linux-raspi2/4.15.0-1013.14 - -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEpgY7tWAjCaQ8jrvULwmejQBegfQFAls6i0UACgkQLwmejQBe gfSMTA/9FAblvfTyzG0thT98+QquIQwhHiptNeDFAdVIXoOFPrVFuSOytbmp8jt/ qg+6E7/UZRnPajvDGbmHlXoIjiyNTC5dBlpocXtpkiy9T1nBHLnuX1CpYM4WLyfS tLJxxi2iBXVKfHldGzeMl2KH3ebaa2VxTytPvfYh73OhVNYV+no5RXYAFWANpZkC ELSS1dzdulu+MXqkDG1qF/hZYg9g66G+k/67IYvBEG7hiD4tujkc3e2d8+WL5ISd +t9NI3BlIuyMpjegBIwK9qS8AsUp9+akbKEVV1jpVwEoCFZeLN0RJnObdRs7YJik aHxzanZiMlE5BHNFY+CyQnTSchX6ZKywRK21sr34seXHgAaCGAacSxGnKlhcO9x8 Tsmbp6BYfzdvWZFEHfHSYZxuM3IVt/FvwXkbRd+FCn8+STGOp8Qw5Y/C/OcVVuzp aYBsS36APep+2duWun4MObrSnT5tOppmPqWqV6PlcmMJNHBpbiYrXm7PrszLPQ6T rUZ120eFxLIx2byiiluFqfnqiG+ZMdWc5bq2BIJrmrqPXQANs9+9qkT/cHcuaKsV viAJwCJ70XqIMhtrFUqlpyq5jpJfwlDIzFDbmuTCIZH8hmvuoki9VQgEYCJlnNIc V1fQaC2gQ8M1SAsoc6l5z79DDghZmbvaKGl2eNz28CNVjLkciEI= =f+nK - -----END PGP SIGNATURE----- - -------------------------------------------------------------------------------- ========================================================================== Ubuntu Security Notice USN-3695-2 July 02, 2018 linux-hwe, linux-azure vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - - Ubuntu 16.04 LTS Summary: Several security issues were fixed in the Linux kernel. Software Description: - - linux-azure: Linux kernel for Microsoft Azure Cloud systems - - linux-hwe: Linux hardware enablement (HWE) kernel Details: USN-3695-1 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. Wen Xu discovered that the ext4 file system implementation in the Linux kernel did not properly initialize the crc32c checksum driver. A local attacker could use this to cause a denial of service (system crash). (CVE-2018-1094) It was discovered that the cdrom driver in the Linux kernel contained an incorrect bounds check. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2018-10940) Wen Xu discovered that the ext4 file system implementation in the Linux kernel did not properly validate xattr sizes. A local attacker could use this to cause a denial of service (system crash). (CVE-2018-1095) Jann Horn discovered that the 32 bit adjtimex() syscall implementation for 64 bit Linux kernels did not properly initialize memory returned to user space in some situations. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2018-11508) It was discovered that an information leak vulnerability existed in the floppy driver in the Linux kernel. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2018-7755) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 16.04 LTS: linux-image-4.15.0-1014-azure 4.15.0-1014.14~16.04.1 linux-image-4.15.0-24-generic 4.15.0-24.26~16.04.1 linux-image-4.15.0-24-generic-lpae 4.15.0-24.26~16.04.1 linux-image-4.15.0-24-lowlatency 4.15.0-24.26~16.04.1 linux-image-azure 4.15.0.1014.21 linux-image-generic-hwe-16.04 4.15.0.24.46 linux-image-generic-lpae-hwe-16.04 4.15.0.24.46 linux-image-lowlatency-hwe-16.04 4.15.0.24.46 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-3695-2 https://usn.ubuntu.com/usn/usn-3695-1 CVE-2018-1094, CVE-2018-10940, CVE-2018-1095, CVE-2018-11508, CVE-2018-7755 Package Information: https://launchpad.net/ubuntu/+source/linux-azure/4.15.0-1014.14~16.04.1 https://launchpad.net/ubuntu/+source/linux-hwe/4.15.0-24.26~16.04.1 - --------------------------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 iQIVAwUBW1awTWaOgq3Tt24GAQh3hQ/+JUTkqCogbsh33VZ1WHEdfyCQ0J0pv86t WsqvPv8hsXwKAM+ZX2rV00uvXXINfQvsvBFXj8XcuiuQBcsJNWcmTkrvN7aq+mgB Imt46EU7dOvNhc90P5PtaNPOr5uXlPSas9mIXxi9ofd2pUFYxWIzGqNyVuwH1T6U Rd9OYinj+UnhJ42MXjoZJOC6YBf6TPKs/LuqcI3Jt1sqBgu5RYNxTczqdKTO49d/ YAQB8tIn0EVybN3324DSodEzw4XVTuwS4PD50QPKfZDesipV+Gc3AQY172PSxGVO 89Ge6ZLFq21h8GpMoPhWO6pf4N6ABkDzHOkAqAPO2oxusfbc9lF/yv8Wt046deIu eHATeoTlEdlD1FD2p1Vs8j6JxXku40GSot8RQZFspzO3wMyJdGFmKysK/JoVZhDr 1kh2MjQnZ5pt4TReR3OJ9KtCTvKp6NisEauZ0FAFEoT8IafBZVol88cWse3URFXJ r5vVHaWUxax4Z+qI2+ZiVTlBPw9yyZcOSbjIjmmrPlz3cwXOkcNip6Q6Y8MFWLMc 8gjPhUO/q2bMqGew+/eI2x5+134X4APJkaT40synfIiRyS0Dx9zfnb5WvXfS2zKZ R9yoW98uZG4iedkJYLzB2OKZUiKKZco9VZWxS4gA9CLTFu7hCA6YXUvJezRZdmOk cbUbe8sH4pg= =tQ+n -----END PGP SIGNATURE-----