drucken bookmarks versenden konfigurieren admin pdf Sicherheit: Mehrere Probleme in Linux
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Mehrere Probleme in Linux |
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ID: |
USN-3540-1 |
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Distribution: |
Ubuntu |
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Plattformen: |
Ubuntu 16.04 LTS |
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Datum: |
Di, 23. Januar 2018, 07:03 |
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Referenzen: |
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-5753
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-5715
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-5754 |
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Applikationen: |
Linux |
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Originalnachricht |
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========================================================================== Ubuntu Security Notice USN-3540-1 January 23, 2018
linux, linux-aws, linux-euclid vulnerabilities ==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 16.04 LTS
Summary:
Several security issues were addressed in the Linux kernel.
Software Description: - linux: Linux kernel - linux-aws: Linux kernel for Amazon Web Services (AWS) systems - linux-euclid: Linux kernel for Intel Euclid systems
Details:
Jann Horn discovered that microprocessors utilizing speculative execution and branch prediction may allow unauthorized memory reads via sidechannel attacks. This flaw is known as Spectre. A local attacker could use this to expose sensitive information, including kernel memory. This update provides mitigations for the i386 (CVE-2017-5753 only), amd64, ppc64el, and s390x architectures. (CVE-2017-5715, CVE-2017-5753)
USN-3522-1 mitigated CVE-2017-5754 (Meltdown) for the amd64 architecture in Ubuntu 16.04 LTS. This update provides the corresponding mitigations for the ppc64el architecture. Original advisory details:
Jann Horn discovered that microprocessors utilizing speculative execution and indirect branch prediction may allow unauthorized memory reads via sidechannel attacks. This flaw is known as Meltdown. A local attacker could use this to expose sensitive information, including kernel memory. (CVE-2017-5754)
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 16.04 LTS: linux-image-4.4.0-1049-aws 4.4.0-1049.58 linux-image-4.4.0-112-generic 4.4.0-112.135 linux-image-4.4.0-112-generic-lpae 4.4.0-112.135 linux-image-4.4.0-112-lowlatency 4.4.0-112.135 linux-image-4.4.0-112-powerpc-e500mc 4.4.0-112.135 linux-image-4.4.0-112-powerpc-smp 4.4.0-112.135 linux-image-4.4.0-112-powerpc64-emb 4.4.0-112.135 linux-image-4.4.0-112-powerpc64-smp 4.4.0-112.135 linux-image-4.4.0-9023-euclid 4.4.0-9023.24 linux-image-aws 4.4.0.1049.51 linux-image-euclid 4.4.0.9023.24 linux-image-generic 4.4.0.112.118 linux-image-generic-lpae 4.4.0.112.118 linux-image-lowlatency 4.4.0.112.118 linux-image-powerpc-e500mc 4.4.0.112.118 linux-image-powerpc-smp 4.4.0.112.118 linux-image-powerpc64-emb 4.4.0.112.118 linux-image-powerpc64-smp 4.4.0.112.118
Please note that fully mitigating CVE-2017-5715 (Spectre Variant 2) requires corresponding processor microcode/firmware updates or, in virtual environments, hypervisor updates. On i386 and amd64 architectures, the IBRS and IBPB features are required to enable the kernel mitigations. Ubuntu is working with Intel and AMD to provide future microcode updates that implement IBRS and IBPB as they are made available. Ubuntu users with a processor from a different vendor should contact the vendor to identify necessary firmware updates. Ubuntu will provide corresponding QEMU updates in the future for users of self-hosted virtual environments in coordination with upstream QEMU. Ubuntu users in cloud environments should contact the cloud provider to confirm that the hypervisor has been updated to expose the new CPU features to virtual machines.
After a standard system update you need to reboot your computer to apply the necessary changes.
References: https://www.ubuntu.com/usn/usn-3540-1 https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/SpectreAndMeltdown CVE-2017-5715, CVE-2017-5753, CVE-2017-5754
Package Information: https://launchpad.net/ubuntu/+source/linux/4.4.0-112.135 https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1049.58 https://launchpad.net/ubuntu/+source/linux-euclid/4.4.0-9023.24
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