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AUSCERT External Security Bulletin Redistribution
ESB-2018.2532
Intel Microcode vulnerabilities
28 August 2018
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AusCERT Security Bulletin Summary
---------------------------------
Product: intel-microcode
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Access Privileged Data -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2018-3646 CVE-2018-3640 CVE-2018-3639
Reference: ASB-2018.0204
ESB-2018.2520
ESB-2018.2487
Original Bulletin:
http://www.ubuntu.com/usn/usn-3756-1
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Ubuntu Security Notice USN-3756-1
August 27, 2018
intel-microcode vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:
- - Ubuntu 18.04 LTS
- - Ubuntu 16.04 LTS
- - Ubuntu 14.04 LTS
Summary:
The system could be made to expose sensitive information.
Software Description:
- - intel-microcode: Processor microcode for Intel CPUs
Details:
It was discovered that memory present in the L1 data cache of an Intel CPU
core may be exposed to a malicious process that is executing on the CPU
core. This vulnerability is also known as L1 Terminal Fault (L1TF). A local
attacker in a guest virtual machine could use this to expose sensitive
information (memory from other guests or the host OS). (CVE-2018-3646)
Jann Horn and Ken Johnson discovered that microprocessors utilizing
speculative execution of a memory read may allow unauthorized memory reads
via a sidechannel attack. This flaw is known as Spectre Variant 4. A local
attacker could use this to expose sensitive information, including kernel
memory. (CVE-2018-3639)
Zdenek Sojka, Rudolf Marek, Alex Zuepke, and Innokentiy Sennovskiy
discovered that microprocessors that perform speculative reads of
system registers may allow unauthorized disclosure of system parameters
via a sidechannel attack. This vulnerability is also known as Rogue
System Register Read (RSRE). An attacker could use this to expose
sensitive information. (CVE-2018-3640)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 18.04 LTS:
intel-microcode 3.20180807a.0ubuntu0.18.04.1
Ubuntu 16.04 LTS:
intel-microcode 3.20180807a.0ubuntu0.16.04.1
Ubuntu 14.04 LTS:
intel-microcode 3.20180807a.0ubuntu0.14.04.1
After a standard system update you need to reboot your computer to make
all the necessary changes.
References:
https://usn.ubuntu.com/usn/usn-3756-1
CVE-2018-3639, CVE-2018-3640, CVE-2018-3646
Package Information:
https://launchpad.net/ubuntu/+source/intel-microcode/3.20180807a.0ubuntu0.18.04.1
https://launchpad.net/ubuntu/+source/intel-microcode/3.20180807a.0ubuntu0.16.04.1
https://launchpad.net/ubuntu/+source/intel-microcode/3.20180807a.0ubuntu0.14.04.1
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