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AUSCERT External Security Bulletin Redistribution
ESB-2020.1584
LSN-0066-1: Kernel Live Patch Security Notice
5 May 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Linux Kernel
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Access Confidential Data -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2020-8649 CVE-2020-8648 CVE-2020-8647
Reference: ESB-2020.1476
ESB-2020.1475
ESB-2020.1474
Original Bulletin:
https://usn.ubuntu.com/lsn/0066-1/
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LSN-0066-1: Kernel Live Patch Security Notice
1 May 2020
Linux kernel vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
o Ubuntu 18.04 LTS
o Ubuntu 16.04 LTS
o Ubuntu 14.04 ESM
Summary
Several security issues were fixed in the Linux kernel.
Software Description
o linux - Linux kernel
o linux-aws - Linux kernel for Amazon Web Services (AWS) systems
o linux-azure - Linux kernel for Microsoft Azure Cloud systems
o linux-oem - Linux kernel for OEM processors
Details
It was discovered that the virtual terminal implementation in the Linux kernel
did not properly handle resize events. A local attacker could use this to
expose sensitive information. (CVE-2020-8647)
It was discovered that the virtual terminal implementation in the Linux kernel
contained a race condition. A local attacker could possibly use this to cause a
denial of service (system crash) or expose sensitive information.
(CVE-2020-8648)
It was discovered that the virtual terminal implementation in the Linux kernel
did not properly handle resize events. A local attacker could use this to
expose sensitive information. (CVE-2020-8649)
Update instructions
The problem can be corrected by updating your kernel livepatch to the following
versions:
Ubuntu 18.04 LTS
aws - 66.1
generic - 66.1
lowlatency - 66.1
oem - 66.1
Ubuntu 16.04 LTS
aws - 66.1
azure - 66.1
generic - 66.1
lowlatency - 66.1
Ubuntu 14.04 ESM
generic - 66.1
lowlatency - 66.1
Support Information
Kernels older than the levels listed below do not receive livepatch updates. If
you are running a kernel version earlier than the one listed below, please
upgrade your kernel as soon as possible.
Ubuntu 18.04 LTS
linux - 4.15.0-69
linux-aws - 4.15.0-1054
linux-azure - 5.0.0-1025
linux-gcp - 5.0.0-1025
linux-oem - 4.15.0-1063
Ubuntu 16.04 LTS
linux - 4.4.0-168
linux-aws - 4.4.0-1098
linux-azure - 4.15.0-1063
linux-hwe - 4.15.0-69
Ubuntu 14.04 ESM
linux-lts-xenial - 4.4.0-168
References
o CVE-2020-8647
o CVE-2020-8648
o CVE-2020-8649
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===========================================================================
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The University of Queensland
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