CVE-2021-28696

Published on: 08/27/2021 12:00:00 AM UTC

Last Modified on: 12/14/2021 09:37:00 PM UTC

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

Certain versions of Debian Linux from Debian contain the following vulnerability:

IOMMU page mapping issues on x86 T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Both AMD and Intel allow ACPI tables to specify regions of memory which should be left untranslated, which typically means these addresses should pass the translation phase unaltered. While these are typically device specific ACPI properties, they can also be specified to apply to a range of devices, or even all devices. On all systems with such regions Xen failed to prevent guests from undoing/replacing such mappings (CVE-2021-28694). On AMD systems, where a discontinuous range is specified by firmware, the supposedly-excluded middle range will also be identity-mapped (CVE-2021-28695). Further, on AMD systems, upon de-assigment of a physical device from a guest, the identity mappings would be left in place, allowing a guest continued access to ranges of memory which it shouldn't have access to anymore (CVE-2021-28696).

  • CVE-2021-28696 has been assigned by URL Logo [email protected] to track the vulnerability - currently rated as MEDIUM severity.

CVSS3 Score: 6.8 - MEDIUM

Attack
Vector
Attack
Complexity
Privileges
Required
User
Interaction
PHYSICAL LOW NONE NONE
Scope Confidentiality
Impact
Integrity
Impact
Availability
Impact
UNCHANGED HIGH HIGH HIGH

CVSS2 Score: 4.6 - MEDIUM

Access
Vector
Access
Complexity
Authentication
LOCAL LOW NONE
Confidentiality
Impact
Integrity
Impact
Availability
Impact
PARTIAL PARTIAL PARTIAL

CVE References

Description Tags Link
oss-security - Re: Xen Security Advisory 378 v3 (CVE-2021-28694,CVE-2021-28695,CVE-2021-28696) - IOMMU page mapping issues on x86 Mailing List
Third Party Advisory
www.openwall.com
text/html
URL Logo MLIST [oss-security] 20210901 Re: Xen Security Advisory 378 v3 (CVE-2021-28694,CVE-2021-28695,CVE-2021-28696) - IOMMU page mapping issues on x86
xenbits.xenproject.org
text/plain
URL Logo MISC xenbits.xenproject.org/xsa/advisory-378.txt
[SECURITY] Fedora 33 Update: xen-4.14.2-3.fc33 - package-announce - Fedora Mailing-Lists lists.fedoraproject.org
text/html
URL Logo FEDORA FEDORA-2021-4f129cc0c1
No Description Provided lists.fedoraproject.org

Inactive LinkNot Archived
URL Logo FEDORA FEDORA-2021-081f9bf5d2
oss-security - Re: Xen Security Advisory 378 v3 (CVE-2021-28694,CVE-2021-28695,CVE-2021-28696) - IOMMU page mapping issues on x86 www.openwall.com
text/html
URL Logo MLIST [oss-security] 20210901 Re: Xen Security Advisory 378 v3 (CVE-2021-28694,CVE-2021-28695,CVE-2021-28696) - IOMMU page mapping issues on x86
Debian -- Security Information -- DSA-4977-1 xen www.debian.org
Depreciated Link
text/html
URL Logo DEBIAN DSA-4977
[SECURITY] Fedora 34 Update: xen-4.14.2-3.fc34 - package-announce - Fedora Mailing-Lists lists.fedoraproject.org
text/html
URL Logo FEDORA FEDORA-2021-d68ed12e46
oss-security - Xen Security Advisory 378 v3 (CVE-2021-28694,CVE-2021-28695,CVE-2021-28696) - IOMMU page mapping issues on x86 www.openwall.com
text/html
URL Logo MLIST [oss-security] 20210901 Xen Security Advisory 378 v3 (CVE-2021-28694,CVE-2021-28695,CVE-2021-28696) - IOMMU page mapping issues on x86

Related QID Numbers

  • 178798 Debian Security Update for xen (DSA 4977-1)
  • 281879 Fedora Security Update for xen (FEDORA-2021-4f129cc0c1)
  • 281880 Fedora Security Update for xen (FEDORA-2021-d68ed12e46)
  • 390249 Oracle Managed Virtualization (VM) Server for x86 Security Update for xen (OVMSA-2021-0033)
  • 751074 SUSE Enterprise Linux Security Update for xen (SUSE-SU-2021:2925-1)
  • 751083 SUSE Enterprise Linux Security Update for xen (SUSE-SU-2021:2924-1)
  • 751085 SUSE Enterprise Linux Security Update for xen (SUSE-SU-2021:2943-1)
  • 751087 SUSE Enterprise Linux Security Update for xen (SUSE-SU-2021:2955-1)
  • 751100 OpenSUSE Security Update for xen (openSUSE-SU-2021:2923-1)
  • 751103 SUSE Enterprise Linux Security Update for xen (SUSE-SU-2021:2957-1)
  • 751111 OpenSUSE Security Update for xen (openSUSE-SU-2021:1236-1)

Exploit/POC from Github

PoC for exploiting CVE-2021-28696 : IOMMU page mapping issues on x86 T[his CNA information record relates to multiple…

Known Affected Configurations (CPE V2.3)

Type Vendor Product Version Update Edition Language
Operating
System
DebianDebian Linux11.0AllAllAll
Operating
System
FedoraprojectFedora33AllAllAll
Operating
System
FedoraprojectFedora34AllAllAll
Operating
System
FedoraprojectFedora35AllAllAll
Operating
System
XenXenAllAllAllAll
  • cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*:
  • cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*:
  • cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*:
  • cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*:
  • cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:*:

Social Mentions

Source Title Posted (UTC)
Twitter Icon @CVEreport CVE-2021-28696 : IOMMU page mapping issues on x86 T[his CNA information record relates to multiple CVEs; the text… twitter.com/i/web/status/1… 2021-08-27 18:53:42
Twitter Icon @threatmeter CVE-2021-28696 IOMMU page mapping issues on x86 T[his CNA information record relates to multiple CVEs; the text exp… twitter.com/i/web/status/1… 2021-08-28 07:09:44
Twitter Icon @SecRiskRptSME RT: CVE-2021-28696 IOMMU page mapping issues on x86 T[his CNA information record relates to multiple CVEs; the tex… twitter.com/i/web/status/1… 2021-08-28 07:33:47
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