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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2017.2978 Linux kernel vulnerability 22 November 2017 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: linux linux-raspi2 linux-hwe linux-gcp Publisher: Ubuntu Operating System: Ubuntu Impact/Access: Execute Arbitrary Code/Commands -- Existing Account Denial of Service -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2017-12188 Original Bulletin: http://www.ubuntu.com/usn/usn-3484-1 http://www.ubuntu.com/usn/usn-3484-2 http://www.ubuntu.com/usn/usn-3484-3 Comment: 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. This bulletin contains three (3) Ubuntu security advisories. All advisories pertain to the same bugfix for different kernels. - --------------------------BEGIN INCLUDED TEXT-------------------- ========================================================================== Ubuntu Security Notice USN-3484-1 November 21, 2017 linux, linux-raspi2 vulnerability ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - - Ubuntu 17.04 Summary: The system could be made to crash or run programs as an administrator. Software Description: - - linux: Linux kernel - - linux-raspi2: Linux kernel for Raspberry Pi 2 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 17.04: linux-image-4.10.0-1021-raspi2 4.10.0-1021.24 linux-image-4.10.0-40-generic 4.10.0-40.44 linux-image-4.10.0-40-generic-lpae 4.10.0-40.44 linux-image-4.10.0-40-lowlatency 4.10.0-40.44 linux-image-generic 4.10.0.40.40 linux-image-generic-lpae 4.10.0.40.40 linux-image-lowlatency 4.10.0.40.40 linux-image-raspi2 4.10.0.1021.22 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-3484-1 CVE-2017-12188 Package Information: https://launchpad.net/ubuntu/+source/linux/4.10.0-40.44 https://launchpad.net/ubuntu/+source/linux-raspi2/4.10.0-1021.24 ========================================================================== Ubuntu Security Notice USN-3484-2 November 21, 2017 linux-hwe 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-hwe: Linux hardware enablement (HWE) kernel Details: USN-3484-1 fixed vulnerabilities in the Linux kernel for Ubuntu 17.04. This update provides the corresponding updates for the Linux Hardware Enablement (HWE) kernel from Ubuntu 17.04 for Ubuntu 16.04 LTS. 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-4.10.0-40-generic 4.10.0-40.44~16.04.1 linux-image-4.10.0-40-generic-lpae 4.10.0-40.44~16.04.1 linux-image-4.10.0-40-lowlatency 4.10.0-40.44~16.04.1 linux-image-generic-hwe-16.04 4.10.0.40.42 linux-image-generic-lpae-hwe-16.04 4.10.0.40.42 linux-image-lowlatency-hwe-16.04 4.10.0.40.42 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-3484-2 https://www.ubuntu.com/usn/usn-3484-1 CVE-2017-12188 Package Information: https://launchpad.net/ubuntu/+source/linux-hwe/4.10.0-40.44~16.04.1 ========================================================================== Ubuntu Security Notice USN-3484-3 November 21, 2017 linux-gcp 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-gcp: Linux kernel for Google Cloud Platform (GCP) 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-4.10.0-1009-gcp 4.10.0-1009.9 linux-image-gcp 4.10.0.1009.11 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-3484-3 https://www.ubuntu.com/usn/usn-3484-1 CVE-2017-12188 Package Information: https://launchpad.net/ubuntu/+source/linux-gcp/4.10.0-1009.9 - --------------------------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 iQIVAwUBWhS7x4x+lLeg9Ub1AQj0nQ//dOHDg9dQocMh6SJWDZDwYtr2z6/PZmeL i+O6l6nLTEl5Vc9IJunh/0JuSuAPRpVY2CBt2Sg2sdpb4rMfQp4/XzH4ktnVImn5 MKMgc6KnKL039msNFU4R6MN+l7Y/9EfgSBTYM88WKf5nPhYlBg1h7vmY2Ubiwnxj bU5LoL1CnSAaxScrXGON6TUtZcyJ0zXYvHKFQqxhbQvhT/QqFq0UOf//WxXMzjd6 7Ie/eP+nrHq6GoKsUVB6AAy8ub8U2gW+mIKE/d1zevgGTV+//F2vE8aDUp0Oqupx XM8GxxXTIa6CKuqg2f+hTWEEou1gh8jzFDlo9gcJBmwSFkwVqL5UcS/J0Ywr3QIu hp0tf/EqaQ8CvNH58BkJJ8LXOjofPBIA2+xqaHWq5R+gnsW+ExkzEUwx3r4wboPU hW4v9V7G7XxR4eUuSgwsPNl0JIPdho2rpqMTffmWghXJF10kQt04u0zJ37LAIomV DhGby8H0yjNZPVzOvVaDZYNfrCxgQVnDZ5E11ziQQ/Gb4gNe+rou4JF97MmKI4GA fQ1TQ2GykqH4uta0fmj/5OLaI0JLsStL3ZZyqS6AqVn0qmPneXc3zBwq8u5kOi6f KOCzKTkvB/MIXmuSvWirKKG6oL5N4It64qJghJBNtaDMru+C/I3GZSHzNAwz9Fvw TK6zHwMvAGM= =AnEt -----END PGP SIGNATURE-----