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Ubuntu: USN-5617-1 (CVE-2020-11743): Xen vulnerabilities

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Ubuntu: USN-5617-1 (CVE-2020-11743): Xen vulnerabilities

Severity
2
CVSS
(AV:L/AC:L/Au:N/C:N/I:N/A:P)
Published
04/14/2020
Created
09/21/2022
Added
09/20/2022
Modified
09/20/2022

Description

An issue was discovered in Xen through 4.13.x, allowing guest OS users to cause a denial of service because of a bad error path in GNTTABOP_map_grant. Grant table operations are expected to return 0 for success, and a negative number for errors. Some misplaced brackets cause one error path to return 1 instead of a negative value. The grant table code in Linux treats this condition as success, and proceeds with incorrectly initialised state. A buggy or malicious guest can construct its grant table in such a way that, when a backend domain tries to map a grant, it hits the incorrect error path. This will crash a Linux based dom0 or backend domain.

Solution(s)

  • ubuntu-upgrade-libxendevicemodel1
  • ubuntu-upgrade-libxenevtchn1
  • ubuntu-upgrade-libxengnttab1
  • ubuntu-upgrade-libxenmisc4-11
  • ubuntu-upgrade-xen-hypervisor-4-11-amd64
  • ubuntu-upgrade-xen-hypervisor-4-11-arm64
  • ubuntu-upgrade-xen-hypervisor-4-11-armhf
  • ubuntu-upgrade-xen-utils-4-11
  • ubuntu-upgrade-xen-utils-common
  • ubuntu-upgrade-xenstore-utils

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