Ubuntu 4985-1: Intel Microcode vulnerabilities

Ubuntu 4985-1: Intel Microcode vulnerabilities

==========================================================================
Ubuntu Security Notice USN-4985-1
June 09, 2021 intel-microcode vulnerabilities
========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 21.04
- Ubuntu 20.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 ESM
- Ubuntu 14.04 ESM Summary: Several security issues were fixed in Intel Microcode. Software Description:
- 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: intel-microcode 3.20210608.0ubuntu0.21.04.1 Ubuntu 20.10: intel-microcode 3.20210608.0ubuntu0.20.10.1 Ubuntu 20.04 LTS: intel-microcode 3.20210608.0ubuntu0.20.04.1 Ubuntu 18.04 LTS: intel-microcode 3.20210608.0ubuntu0.18.04.1 Ubuntu 16.04 ESM: intel-microcode 3.20210608.0ubuntu0.16.04.1+esm1 Ubuntu 14.04 ESM: intel-microcode 3.20210608.0ubuntu0.14.04.1+esm1 After a standard system update you need to reboot your computer to make
all the necessary changes. References: https://ubuntu.com/security/notices/USN-4985-1 CVE-2020-24511, CVE-2020-24512, CVE-2020-24513, CVE-2021-24489 Package Information: https://launchpad.net/ubuntu/+source/intel-microcode/3.20210608.0ubuntu0.21.04.1 https://launchpad.net/ubuntu/+source/intel-microcode/3.20210608.0ubuntu0.20.10.1 https://launchpad.net/ubuntu/+source/intel-microcode/3.20210608.0ubuntu0.20.04.1 https://launchpad.net/ubuntu/+source/intel-microcode/3.20210608.0ubuntu0.18.04.1

https://linuxsecurity.com/advisories/ubuntu/ubuntu-4985-1-intel-microcode-vulnerabilities-11-07-05