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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.0716 Linux kernel vulnerabilities 7 March 2019 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: linux kernel Publisher: Ubuntu Operating System: Ubuntu Impact/Access: Execute Arbitrary Code/Commands -- Existing Account Increased Privileges -- Existing Account Modify Arbitrary Files -- Existing Account Denial of Service -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2019-6133 CVE-2018-18397 CVE-2018-16880 Reference: ESB-2019.0691 ESB-2019.0670 ESB-2019.0609 ESB-2019.0291 ESB-2019.0231 Original Bulletin: https://usn.ubuntu.com/3903-1/ https://usn.ubuntu.com/3903-2/ Comment: This bulletin contains two (2) security advisories. - --------------------------BEGIN INCLUDED TEXT-------------------- ======================================================================== USN-3903-1: Linux kernel vulnerabilities 6 March 2019 linux, linux-azure, linux-gcp, linux-kvm, linux-raspi2 vulnerabilities ======================================================================== A security issue affects these releases of Ubuntu and its derivatives: o Ubuntu 18.10 Summary Several security issues were fixed in the Linux kernel. Software Description o linux - Linux kernel 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-raspi2 - Linux kernel for Raspberry Pi 2 Details Jason Wang discovered that the vhost net driver in the Linux kernel contained an out of bounds write vulnerability. An attacker in a guest virtual machine could use this to cause a denial of service (host system crash) or possibly execute arbitrary code in the host kernel. (CVE-2018-16880) Jann Horn discovered that the userfaultd implementation in the Linux kernel did not properly restrict access to certain ioctls. A local attacker could use this possibly to modify files. (CVE-2018-18397) Jann Horn discovered a race condition in the fork() system call in the Linux kernel. A local attacker could use this to gain access to services that cache authorizations. (CVE-2019-6133) Update instructions The problem can be corrected by updating your system to the following package versions: Ubuntu 18.10 linux-image-4.18.0-1007-gcp - 4.18.0-1007.8 linux-image-4.18.0-1008-kvm - 4.18.0-1008.8 linux-image-4.18.0-1010-raspi2 - 4.18.0-1010.12 linux-image-4.18.0-1013-azure - 4.18.0-1013.13 linux-image-4.18.0-16-generic - 4.18.0-16.17 linux-image-4.18.0-16-generic-lpae - 4.18.0-16.17 linux-image-4.18.0-16-lowlatency - 4.18.0-16.17 linux-image-4.18.0-16-snapdragon - 4.18.0-16.17 linux-image-azure - 4.18.0.1013.14 linux-image-gcp - 4.18.0.1007.7 linux-image-generic - 4.18.0.16.17 linux-image-generic-lpae - 4.18.0.16.17 linux-image-gke - 4.18.0.1007.7 linux-image-kvm - 4.18.0.1008.8 linux-image-lowlatency - 4.18.0.16.17 linux-image-raspi2 - 4.18.0.1010.7 linux-image-snapdragon - 4.18.0.16.17 To update your system, please follow these instructions: https:// wiki.ubuntu.com/Security/Upgrades . 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-2018-16880 o CVE-2018-18397 o CVE-2019-6133 =============================================================================== ======================================================================== USN-3903-2: Linux kernel (HWE) vulnerabilities 6 March 2019 linux-hwe, linux-azure 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-azure - Linux kernel for Microsoft Azure Cloud systems o linux-hwe - Linux hardware enablement (HWE) kernel Details USN-3903-1 fixed vulnerabilities in the Linux kernel for Ubuntu 18.10. This update provides the corresponding updates for the Linux Hardware Enablement (HWE) kernel from Ubuntu 18.10 for Ubuntu 18.04 LTS. Jason Wang discovered that the vhost net driver in the Linux kernel contained an out of bounds write vulnerability. An attacker in a guest virtual machine could use this to cause a denial of service (host system crash) or possibly execute arbitrary code in the host kernel. (CVE-2018-16880) Jann Horn discovered that the userfaultd implementation in the Linux kernel did not properly restrict access to certain ioctls. A local attacker could use this possibly to modify files. (CVE-2018-18397) Jann Horn discovered a race condition in the fork() system call in the Linux kernel. A local attacker could use this to gain access to services that cache authorizations. (CVE-2019-6133) Update instructions The problem can be corrected by updating your system to the following package versions: Ubuntu 18.04 LTS linux-image-4.18.0-1013-azure - 4.18.0-1013.13~18.04.1 linux-image-4.18.0-16-generic - 4.18.0-16.17~18.04.1 linux-image-4.18.0-16-generic-lpae - 4.18.0-16.17~18.04.1 linux-image-4.18.0-16-lowlatency - 4.18.0-16.17~18.04.1 linux-image-4.18.0-16-snapdragon - 4.18.0-16.17~18.04.1 linux-image-azure - 4.18.0.1013.12 linux-image-generic-hwe-18.04 - 4.18.0.16.66 linux-image-generic-lpae-hwe-18.04 - 4.18.0.16.66 linux-image-lowlatency-hwe-18.04 - 4.18.0.16.66 linux-image-snapdragon-hwe-18.04 - 4.18.0.16.66 To update your system, please follow these instructions: https:// wiki.ubuntu.com/Security/Upgrades . 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-3903-1 o CVE-2018-16880 o CVE-2018-18397 o CVE-2019-6133 - --------------------------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. 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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 iQIVAwUBXIC4w2aOgq3Tt24GAQhm+xAAxnoTQ+83B26x+1HNuVbOvLXF+1yCGb4x F9JKzVX99cckOhe1o+QLLF9j9peSWqpP87PdI5DbImnrFhEOEyQfqjoJgWZ1zu1l Mxsxv/1FqpPpqMthxELyrh0V1F4ZQN660FEGPkEcVkRBnwGgMwyumsWU96soo+KW yXSD3bS2KDFzGp03RFJmKfHMF45t/nNhNbG4kL46mV9IvaatfE0lc7g8cneeD5oC NhwO45DEZA3SGNl2hTfF998ttzNESygeOu/CG+15wf9cApD5FUgm1AGuuNShOxzx eOjrHROfkdKf46SKYhSGY7q5z0XO4yGQZmH/UqZ1n1AQYxNVPqqcRy3o2s9Lody+ XTl3jh7MlKaS2WPkhrmFGU02Nvsw5Z37l3VQkJFTsBrB1KlTWV3Eca/GatXQdu44 FPqo0wVs3ZLd1uhSB70K04nySmLA4x2ecJRds/RcuKDQHkgpOJa9TZUH8r2M+bc/ u5cFrVPiJ1nXuXhdClMMXNYzTphRoQ1W222P+dPeqkDlCG5BcS3+ep6IoN0F/D9V lkN8wFFv0Pb6e0DyxVjaduwrzjFGShd7ircIyMBsRDWzkUyvm6FU+CZwSy+y58HH OiIR+2lcs++mPmZkx6QZl6hHsnue/JffopkOtdHKOkMJv5tCYOP9oicLKeFmrZyw QnYT1f1Q7xg= =jQoC -----END PGP SIGNATURE-----