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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.0321 Linux kernel vulnerabilities 5 February 2019 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: kernel Publisher: Ubuntu Operating System: Ubuntu Impact/Access: Denial of Service -- Existing Account Access Confidential Data -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2018-20169 CVE-2018-19824 CVE-2018-19407 CVE-2018-16862 CVE-2018-10883 Reference: ESB-2019.0314 ESB-2019.0256 Original Bulletin: http://www.ubuntu.com/usn/usn-3879-1 http://www.ubuntu.com/usn/usn-3879-2 Comment: This bulletin contains two (2) Ubuntu security advisories. - --------------------------BEGIN INCLUDED TEXT-------------------- ========================================================================== Ubuntu Security Notice USN-3879-1 February 04, 2019 linux, linux-aws, linux-kvm, linux-raspi2, linux-snapdragon 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: Linux kernel - - linux-aws: Linux kernel for Amazon Web Services (AWS) systems - - linux-kvm: Linux kernel for cloud environments - - linux-raspi2: Linux kernel for Raspberry Pi 2 - - linux-snapdragon: Linux kernel for Snapdragon processors Details: Wen Xu discovered that the ext4 file system implementation in the Linux kernel could possibly perform an out of bounds write when updating the journal for an inline file. An attacker could use this to construct a malicious ext4 image that, when mounted, could cause a denial of service (system crash). (CVE-2018-10883) Vasily Averin and Pavel Tikhomirov discovered that the cleancache subsystem of the Linux kernel did not properly initialize new files in some situations. A local attacker could use this to expose sensitive information. (CVE-2018-16862) Wei Wu discovered that the KVM implementation in the Linux kernel did not properly ensure that ioapics were initialized. A local attacker could use this to cause a denial of service (system crash). (CVE-2018-19407) Mathias Payer and Hui Peng discovered a use-after-free vulnerability in the Advanced Linux Sound Architecture (ALSA) subsystem. A physically proximate attacker could use this to cause a denial of service (system crash). (CVE-2018-19824) Hui Peng and Mathias Payer discovered that the USB subsystem in the Linux kernel did not properly handle size checks when handling an extra USB descriptor. A physically proximate attacker could use this to cause a denial of service (system crash). (CVE-2018-20169) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 16.04 LTS: linux-image-4.4.0-1040-kvm 4.4.0-1040.46 linux-image-4.4.0-1075-aws 4.4.0-1075.85 linux-image-4.4.0-1103-raspi2 4.4.0-1103.111 linux-image-4.4.0-1107-snapdragon 4.4.0-1107.112 linux-image-4.4.0-142-generic 4.4.0-142.168 linux-image-4.4.0-142-generic-lpae 4.4.0-142.168 linux-image-4.4.0-142-lowlatency 4.4.0-142.168 linux-image-4.4.0-142-powerpc-e500mc 4.4.0-142.168 linux-image-4.4.0-142-powerpc-smp 4.4.0-142.168 linux-image-4.4.0-142-powerpc64-emb 4.4.0-142.168 linux-image-4.4.0-142-powerpc64-smp 4.4.0-142.168 linux-image-aws 4.4.0.1075.77 linux-image-generic 4.4.0.142.148 linux-image-generic-lpae 4.4.0.142.148 linux-image-kvm 4.4.0.1040.39 linux-image-lowlatency 4.4.0.142.148 linux-image-powerpc-e500mc 4.4.0.142.148 linux-image-powerpc-smp 4.4.0.142.148 linux-image-powerpc64-emb 4.4.0.142.148 linux-image-powerpc64-smp 4.4.0.142.148 linux-image-raspi2 4.4.0.1103.103 linux-image-snapdragon 4.4.0.1107.99 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-3879-1 CVE-2018-10883, CVE-2018-16862, CVE-2018-19407, CVE-2018-19824, CVE-2018-20169 Package Information: https://launchpad.net/ubuntu/+source/linux/4.4.0-142.168 https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1075.85 https://launchpad.net/ubuntu/+source/linux-kvm/4.4.0-1040.46 https://launchpad.net/ubuntu/+source/linux-raspi2/4.4.0-1103.111 https://launchpad.net/ubuntu/+source/linux-snapdragon/4.4.0-1107.112 - ------------------------------------------------------------------------------- ========================================================================== Ubuntu Security Notice USN-3879-2 February 04, 2019 linux-lts-xenial, linux-aws vulnerabilities ========================================================================== 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-aws: Linux kernel for Amazon Web Services (AWS) systems - - linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty Details: USN-3879-1 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. Wen Xu discovered that the ext4 file system implementation in the Linux kernel could possibly perform an out of bounds write when updating the journal for an inline file. An attacker could use this to construct a malicious ext4 image that, when mounted, could cause a denial of service (system crash). (CVE-2018-10883) Vasily Averin and Pavel Tikhomirov discovered that the cleancache subsystem of the Linux kernel did not properly initialize new files in some situations. A local attacker could use this to expose sensitive information. (CVE-2018-16862) Wei Wu discovered that the KVM implementation in the Linux kernel did not properly ensure that ioapics were initialized. A local attacker could use this to cause a denial of service (system crash). (CVE-2018-19407) Mathias Payer and Hui Peng discovered a use-after-free vulnerability in the Advanced Linux Sound Architecture (ALSA) subsystem. A physically proximate attacker could use this to cause a denial of service (system crash). (CVE-2018-19824) Hui Peng and Mathias Payer discovered that the USB subsystem in the Linux kernel did not properly handle size checks when handling an extra USB descriptor. A physically proximate attacker could use this to cause a denial of service (system crash). (CVE-2018-20169) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 14.04 LTS: linux-image-4.4.0-1038-aws 4.4.0-1038.41 linux-image-4.4.0-142-generic 4.4.0-142.168~14.04.1 linux-image-4.4.0-142-generic-lpae 4.4.0-142.168~14.04.1 linux-image-4.4.0-142-lowlatency 4.4.0-142.168~14.04.1 linux-image-4.4.0-142-powerpc-e500mc 4.4.0-142.168~14.04.1 linux-image-4.4.0-142-powerpc-smp 4.4.0-142.168~14.04.1 linux-image-4.4.0-142-powerpc64-emb 4.4.0-142.168~14.04.1 linux-image-4.4.0-142-powerpc64-smp 4.4.0-142.168~14.04.1 linux-image-aws 4.4.0.1038.38 linux-image-generic-lpae-lts-xenial 4.4.0.142.122 linux-image-generic-lts-xenial 4.4.0.142.122 linux-image-lowlatency-lts-xenial 4.4.0.142.122 linux-image-powerpc-e500mc-lts-xenial 4.4.0.142.122 linux-image-powerpc-smp-lts-xenial 4.4.0.142.122 linux-image-powerpc64-emb-lts-xenial 4.4.0.142.122 linux-image-powerpc64-smp-lts-xenial 4.4.0.142.122 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-3879-2 https://usn.ubuntu.com/usn/usn-3879-1 CVE-2018-10883, CVE-2018-16862, CVE-2018-19407, CVE-2018-19824, CVE-2018-20169 Package Information: https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1038.41 https://launchpad.net/ubuntu/+source/linux-lts-xenial/4.4.0-142.168~14.04.1 - --------------------------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 iQIVAwUBXFkHFWaOgq3Tt24GAQjWNw//dxHQkpmxe4W59ahQq7v/wJb1Xn3tfJiP hDph/BfMCYYUSTxAotm2rKfiyDb5TDRpqMfety2YRlZIWuF+ytV9xlSwz/ohnrEV WOygas7cWvhKGMWUQdFf/AzJlUYk5rH3JJdKSo3fXx/PW6RBFsnJMnmyb/DMN5Ay doxI84NadBngUN9RQZElfHc/fZXg/AHGowXOErWyop9drTMofjQekYmQM6xHJx9+ FcCXdRnVIKLUv28nSENDZ9koxwVJeaxzYGMXw+TUoS+x52QsGwYOr/8y8pUAxoDv bNGcQmqCZuMqw2bvzXgb77GH8sqo28NrWj8JfoUFdxVopA1k0vN0UB5JJtlpU4c/ bvkqOlDmb7tTdrH2fOuJxoWO658ZtrMQPql3hNhq4l/U/l2RRsaGFiCpfGdDyQ3r 5diEF7hN1TEE9gIW7meCdbVNacs/JfHrME6Qh56O/aJo5FN+BBj4pDqGsYmCBMcb FKhh2BVRGcCsQ6dcB38LQ3pKQJH1wBvDL7Z2hUKJpSvuBIDU/Tz/07FcoUvEZmMR L4bav14EbPvE7KURMyU9QPrAB2k0Ngr1dEwpkfBVg2lEAfkloaeie4jD2ZsGRA0y PjDokcIfNt13wsqVKpFv3pQa3QT6BlTT6NLzRAzz7J28D21BNllJY74GZn/PTxa9 juSf4p8vr84= =b9NO -----END PGP SIGNATURE-----