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Ubuntu 20.04 LTS USN-5617-1 Critical: Xen Denial Of Service Risks

ubuntu
Calendar Grey September 19, 2022
Dist Ubuntu Esm H88
Recent vulnerabilities concerning Xen have been addressed in Ubuntu 20.04 LTS. Enhance your system's security by performing an update immediately to minimize potential threats.
Several security issues were fixed in Xen.

Summary

Several security issues were fixed in Xen.

Software Description:

- xen: Public headers and libs for Xen

Details:

It was discovered that memory contents previously stored in

microarchitectural special registers after RDRAND, RDSEED, and SGX EGETKEY

read operations on Intel client and Xeon E3 processors may be briefly

exposed to processes on the same or different processor cores. A local

attacker could use this to expose sensitive information. (CVE-2020-0543)

Julien Grall discovered that Xen incorrectly handled memory barriers on

ARM-based systems. An attacker could possibly use this issue to cause a

denial of service, obtain sensitive information or escalate privileges.

(CVE-2020-11739)

Ilja Van Sprundel discovered that Xen incorrectly handled profiling of

guests. An unprivileged attacker could use this issue to obtain sensitive

information from other guests, cause a denial of service or possibly gain

privileges. (CVE-2020-11740, CVE-2020-11741)

It was ...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu memory exposure Xen

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 20.04 LTS:
  libxendevicemodel1              4.11.3+24-g14b62ab3e5-1ubuntu2.3
  libxenevtchn1                   4.11.3+24-g14b62ab3e5-1ubuntu2.3
  libxengnttab1                   4.11.3+24-g14b62ab3e5-1ubuntu2.3
  libxenmisc4.11                  4.11.3+24-g14b62ab3e5-1ubuntu2.3
  xen-hypervisor-4.11-amd64       4.11.3+24-g14b62ab3e5-1ubuntu2.3
  xen-hypervisor-4.11-arm64       4.11.3+24-g14b62ab3e5-1ubuntu2.3
  xen-hypervisor-4.11-armhf       4.11.3+24-g14b62ab3e5-1ubuntu2.3
  xen-utils-4.11                  4.11.3+24-g14b62ab3e5-1ubuntu2.3
  xen-utils-common                4.11.3+24-g14b62ab3e5-1ubuntu2.3
  xenstore-utils                  4.11.3+24-g14b62ab3e5-1ubuntu2.3

After a standard system update you need to reboot your computer to make
all the necessary changes.

References

https://ubuntu.com/security/notices/USN-5617-1

CVE-2020-0543, CVE-2020-11739, CVE-2020-11740, CVE-2020-11741,

CVE-2020-11742, CVE-2020-11743, CVE-2020-15563, CVE-2020-15564,

CVE-2020-15565, CVE-2020-15566, CVE-2020-15567, CVE-2020-25595,

CVE-2020-25596, CVE-2020-25597, CVE-2020-25599, CVE-2020-25600,

CVE-2020-25601, CVE-2020-25602, CVE-2020-25603, CVE-2020-25604

Severity
critical
Lowest
Low
Medium
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Critical

September 19, 2022

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu memory exposure Xen

Package Information

https://launchpad.net/ubuntu/+source/xen/4.11.3+24-g14b62ab3e5-1ubuntu2.3

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