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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2017.2981 Linux kernel (Azure) vulnerability 22 November 2017 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: linux-azure Publisher: Ubuntu Operating System: Ubuntu Impact/Access: Root Compromise -- Existing Account Denial of Service -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2017-12188 Reference: ESB-2017.2978 Original Bulletin: http://www.ubuntu.com/usn/usn-3488-1 - --------------------------BEGIN INCLUDED TEXT-------------------- ========================================================================== Ubuntu Security Notice USN-3488-1 November 21, 2017 linux-azure vulnerability ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - - Ubuntu 16.04 LTS Summary: The system could be made to crash or run programs as an administrator. Software Description: - - linux-azure: Linux kernel for Microsoft Azure Cloud systems Details: It was discovered that the KVM subsystem in the Linux kernel did not properly keep track of nested levels in guest page tables. A local attacker in a guest VM could use this to cause a denial of service (host OS crash) or possibly execute arbitrary code in the host OS. Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 16.04 LTS: linux-image-4.11.0-1015-azure 4.11.0-1015.15 linux-image-azure 4.11.0.1015.15 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://www.ubuntu.com/usn/usn-3488-1 CVE-2017-12188 Package Information: https://launchpad.net/ubuntu/+source/linux-azure/4.11.0-1015.15 - --------------------------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 iQIVAwUBWhTRDox+lLeg9Ub1AQjbqRAAmb4smQuR5XaN6Jf307XPDHPp5iW18MD0 ul68rlrPpD7yaV/Pgzaezh1/Fe+3zqJ5eMWl4W5PPhLbp72YQWyehCGWkEbIbKq9 QM5orIqAeb4lToySsiHJkSAJ8dCCUDRiaw0QYCFGzkmsvQVM5HUDr/Awjs9qH/gm re69GhC3D02BjFVacLrOJrdKbCL8IANIkpKMX9cwtvy9STqYESSjDcBKecUzZbah 3vYyVCXWkU5FvNB4V7xAQKIm2ILHQqiG6TESRxqwaLs+asjew4l1KMhVZVUIT0vC TeQ5Y2uDtqP1UvkNHBYIspQNdcyxXLR79wHVhpXCVJ6x0KpLq3PyDDb39jM0QCch FGoF615iWZ1lv/uQmaJSxGvSvH91jexmYw3SfdwEXOufVh9z7ay0q8+YHzKFLXsr KR6294uWz5IYL5dHMJ8UlJNFsc/34HuN8mQt6Yt1f8GkBJSNm81FwrsSFlUW2S+e X0W7+/YxacGenuYjwPm6tftiulncevEUCgrw1J/88Gc8nzVIXF+bbrBE9L9Z6i5r 429bp2Dzdq3r4QRYuG7uAeXZ0K6QK9tRWJy4UL63ynu3twQFU8aYmCiKJgw+fNoa HK7W+ZSqCvn+7zyLb3f4r6NhtoEplKKNxmGKD2d6GHFTD/L+Rkjmycvnm761bWX/ XXgnXiOpooI= =XeAj -----END PGP SIGNATURE-----