CVE-2021-28704

Published on: 11/23/2021 12:00:00 AM UTC

Last Modified on: 12/01/2021 07:57:00 AM UTC

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Certain versions of Fedora from Fedoraproject contain the following vulnerability:

PoD operations on misaligned GFNs T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] x86 HVM and PVH guests may be started in populate-on-demand (PoD) mode, to provide a way for them to later easily have more memory assigned. Guests are permitted to control certain P2M aspects of individual pages via hypercalls. These hypercalls may act on ranges of pages specified via page orders (resulting in a power-of-2 number of pages). The implementation of some of these hypercalls for PoD does not enforce the base page frame number to be suitably aligned for the specified order, yet some code involved in PoD handling actually makes such an assumption. These operations are XENMEM_decrease_reservation (CVE-2021-28704) and XENMEM_populate_physmap (CVE-2021-28707), the latter usable only by domains controlling the guest, i.e. a de-privileged qemu or a stub domain. (Patch 1, combining the fix to both these two issues.) In addition handling of XENMEM_decrease_reservation can also trigger a host crash when the specified page order is neither 4k nor 2M nor 1G (CVE-2021-28708, patch 2).

  • CVE-2021-28704 has been assigned by URL Logo [email protected] to track the vulnerability - currently rated as HIGH severity.
  • Affected Vendor/Software: URL Logo Xen - xen version xen-unstable
  • Affected Vendor/Software: URL Logo Xen - xen version ?< 4.12
  • Affected Vendor/Software: URL Logo Xen - xen version >= 4.12.x
  • Affected Vendor/Software: URL Logo Xen - xen version !> 4.14.x
  • Affected Vendor/Software: URL Logo Xen - xen version 4.15.x

CVSS3 Score: 8.8 - HIGH

Attack
Vector
Attack
Complexity
Privileges
Required
User
Interaction
LOCAL LOW LOW NONE
Scope Confidentiality
Impact
Integrity
Impact
Availability
Impact
CHANGED HIGH HIGH HIGH

CVSS2 Score: 6.9 - MEDIUM

Access
Vector
Access
Complexity
Authentication
LOCAL MEDIUM NONE
Confidentiality
Impact
Integrity
Impact
Availability
Impact
COMPLETE COMPLETE COMPLETE

CVE References

Description Tags Link
[SECURITY] Fedora 35 Update: xen-4.15.1-4.fc35 - package-announce - Fedora Mailing-Lists Mailing List
Third Party Advisory
lists.fedoraproject.org
text/html
URL Logo FEDORA FEDORA-2021-03645e9807
xenbits.xenproject.org
text/plain
URL Logo MISC xenbits.xenproject.org/xsa/advisory-388.txt

Related QID Numbers

  • 751411 SUSE Enterprise Linux Security Update for xen (SUSE-SU-2021:3852-1)
  • 751414 SUSE Enterprise Linux Security Update for xen (SUSE-SU-2021:3851-1)
  • 751417 SUSE Enterprise Linux Security Update for xen (SUSE-SU-2021:3842-1)
  • 751422 SUSE Enterprise Linux Security Update for xen (SUSE-SU-2021:3849-1)

Known Affected Configurations (CPE V2.3)

Type Vendor Product Version Update Edition Language
Operating
System
FedoraprojectFedora35AllAllAll
Operating
System
XenXenAllAllAllAll
  • cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*:
  • cpe:2.3:o:xen:xen:*:*:*:*:*:*:x86:*:

Social Mentions

Source Title Posted (UTC)
Twitter Icon @CVEreport CVE-2021-28704 : PoD operations on misaligned GFNs T[his CNA information record relates to multiple CVEs; the text… twitter.com/i/web/status/1… 2021-11-24 01:00:22
Twitter Icon @oss_security Xen Security Advisory 388 v3 (CVE-2021-28704,CVE-2021-28707,CVE-2021-28708) - PoD operations on misaligned GFNs: Po… twitter.com/i/web/status/1… 2021-11-24 02:30:14
© CVE.report 2021 Twitter Nitter Twitter Viewer |

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