30 January 2019
Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.0254 Linux kernel (HWE) vulnerabilities 30 January 2019 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: linux-hwe Publisher: Ubuntu Operating System: Ubuntu Impact/Access: Increased Privileges -- Existing Account Access Privileged Data -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2018-19854 CVE-2018-19407 CVE-2018-16882 CVE-2018-14625 Reference: ESB-2019.0253 ESB-2019.0138 Original Bulletin: http://www.ubuntu.com/usn/usn-3872-1 - --------------------------BEGIN INCLUDED TEXT-------------------- ========================================================================== Ubuntu Security Notice USN-3872-1 January 29, 2019 linux-hwe 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-hwe: Linux hardware enablement (HWE) kernel Details: It was discovered that a race condition existed in the vsock address family implementation of the Linux kernel that could lead to a use-after-free condition. A local attacker in a guest virtual machine could use this to expose sensitive information (host machine kernel memory). (CVE-2018-14625) Cfir Cohen discovered that a use-after-free vulnerability existed in the KVM implementation of the Linux kernel, when handling interrupts in environments where nested virtualization is in use (nested KVM virtualization is not enabled by default in Ubuntu kernels). A local attacker in a guest VM could possibly use this to gain administrative privileges in a host machine. (CVE-2018-16882) 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) It was discovered that the crypto subsystem of the Linux kernel leaked uninitialized memory to user space in some situations. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2018-19854) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 18.04 LTS: linux-image-4.18.0-14-generic 4.18.0-14.15~18.04.1 linux-image-4.18.0-14-generic-lpae 4.18.0-14.15~18.04.1 linux-image-4.18.0-14-lowlatency 4.18.0-14.15~18.04.1 linux-image-4.18.0-14-snapdragon 4.18.0-14.15~18.04.1 linux-image-generic-hwe-18.04 22.214.171.124.64 linux-image-generic-lpae-hwe-18.04 126.96.36.199.64 linux-image-lowlatency-hwe-18.04 188.8.131.52.64 linux-image-snapdragon-hwe-18.04 184.108.40.206.64 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-3872-1 CVE-2018-14625, CVE-2018-16882, CVE-2018-19407, CVE-2018-19854 Package Information: https://launchpad.net/ubuntu/+source/linux-hwe/4.18.0-14.15~18.04.1 - --------------------------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 email@example.com 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: firstname.lastname@example.org 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 iQIVAwUBXFENe2aOgq3Tt24GAQiMow/+JFvaanAguGe9jfRnPtvVdJn8VyJ8QlDR FGL+mjfGqF5ZMQCxhA+Q35AcAmaD2Z5MbiDL/KGBRVhKpoxGnkk627+auMr6Lh6z 3y6DuuQy+pjxsC1sSz1qqlfEdZAMIPAs92nCUdd/hI9wMs8i0roxh6hprZ60SeE8 yZ/yPN42zodb/AtIr3XE9bNiZvBtyCGjmVJqQ9UjaII57PTy9FAfVPH8ZRj4ox+B kpxZC+trKK1bdWHUFyjoe46WuJ1eqyGXmf3kl6rA7alnyJrlEalwOlQ+gbnUOWjR uaSIgaaLs3WdPaNEpUIx3UkI7zYiSjqUOx2NrK0YVv+1kB79v+vEuOHHF5b+sEgE nfMLfXhtkn3dGN2208n/GYrFLXBQS3+q2nGyWGPhSQQiYxu0QUHEOuwbYo2v/iaU pDEb5TIK2VcggsBSGoofFKTf0fpQdPAaRXw7znj8m5LnBR4pZ4v7ZIvpkr8bi/3S PsxY93Ifb/ov0h31a52SwXiPBI6RuNzGTpONr/tkFFxpYGU2lWjSPhcmcBBfbCed sN/aipw8HBGGyPLDfQhQe6kRWaEjWkMJtbxB2tCZPwj9wYMz4xnAkRzJlbt4fqVc HB6hihNHmc+McmxMyjtxuW3A7PzSrcoVL660ztK3eguyCBO/g4JIOXxcI5nC1HGv brQUz/1I91M= =LunF -----END PGP SIGNATURE-----