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AUSCERT External Security Bulletin Redistribution
ESB-2021.2055
USN-4985-1: Intel Microcode vulnerabilities
9 June 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Intel Microcode
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Increased Privileges -- Existing Account
Access Confidential Data -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-24489 CVE-2020-24513 CVE-2020-24512
CVE-2020-24511 CVE-2017-5715
Reference: ESB-2021.2030
ESB-2021.2010
ESB-2021.1998
Original Bulletin:
https://ubuntu.com/security/notices/USN-4985-1
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USN-4985-1: Intel Microcode vulnerabilities
09 June 2021
Several security issues were fixed in Intel Microcode.
Releases
o Ubuntu 21.04
o Ubuntu 20.10
o Ubuntu 20.04 LTS
o Ubuntu 18.04 LTS
o Ubuntu 16.04 ESM
o Ubuntu 14.04 ESM
Packages
o intel-microcode - Processor microcode for Intel CPUs
Details
It was discovered that some Intel processors may not properly invalidate
cache entries used by Intel Virtualization Technology for Directed I/O
(VT-d). This may allow a local user to perform a privilege escalation
attack. ( CVE-2021-24489 )
Joseph Nuzman discovered that some Intel processors may not properly apply
EIBRS mitigations (originally developed for CVE-2017-5715 ) and hence may
allow unauthorized memory reads via sidechannel attacks. A local attacker
could use this to expose sensitive information, including kernel
memory. ( CVE-2020-24511 )
Travis Downs discovered that some Intel processors did not properly flush
cache-lines for trivial-data values. This may allow an unauthorized user to
infer the presence of these trivial-data-cache-lines via timing sidechannel
attacks. A local attacker could use this to expose sensitive
information. ( CVE-2020-24512 )
It was discovered that certain Intel Atom processors could expose memory
contents stored in microarchitectural buffers. A local attacker could use
this to expose sensitive information. ( CVE-2020-24513 )
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 21.04
o intel-microcode - 3.20210608.0ubuntu0.21.04.1
Ubuntu 20.10
o intel-microcode - 3.20210608.0ubuntu0.20.10.1
Ubuntu 20.04
o intel-microcode - 3.20210608.0ubuntu0.20.04.1
Ubuntu 18.04
o intel-microcode - 3.20210608.0ubuntu0.18.04.1
Ubuntu 16.04
o intel-microcode - 3.20210608.0ubuntu0.16.04.1+esm1
Available with UA Infra or UA Desktop
Ubuntu 14.04
o intel-microcode - 3.20210608.0ubuntu0.14.04.1+esm1
Available with UA Infra or UA Desktop
After a standard system update you need to reboot your computer to make
all the necessary changes.
References
o CVE-2020-24512
o CVE-2021-24489
o CVE-2020-24513
o CVE-2020-24511
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