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Vulnerability Details : CVE-2021-28707

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).
Publish Date : 2021-11-24 Last Update Date : 2021-12-15
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- CVSS Scores & Vulnerability Types

CVSS Score
6.9
Confidentiality Impact Complete (There is total information disclosure, resulting in all system files being revealed.)
Integrity Impact Complete (There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the entire system being compromised.)
Availability Impact Complete (There is a total shutdown of the affected resource. The attacker can render the resource completely unavailable.)
Access Complexity Medium (The access conditions are somewhat specialized. Some preconditions must be satistified to exploit)
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s)
CWE ID 77

- Products Affected By CVE-2021-28707

# Product Type Vendor Product Version Update Edition Language
1 OS Debian Debian Linux 11.0 * * * Version Details Vulnerabilities
2 OS Fedoraproject Fedora 34 * * * Version Details Vulnerabilities
3 OS Fedoraproject Fedora 35 * * * Version Details Vulnerabilities
4 OS XEN XEN * * * * Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Debian Debian Linux 1
Fedoraproject Fedora 2
XEN XEN 1

- References For CVE-2021-28707

https://www.debian.org/security/2021/dsa-5017
DEBIAN DSA-5017
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PXUI4VMD52CH3T7YXAG3J2JW7ZNN3SXF/
FEDORA FEDORA-2021-2b3a2de94f
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/I7ZGWVVRI4XY2XSTBI3XEMWBXPDVX6OT/
FEDORA FEDORA-2021-03645e9807
https://xenbits.xenproject.org/xsa/advisory-388.txt

- Metasploit Modules Related To CVE-2021-28707

There are not any metasploit modules related to this CVE entry (Please visit www.metasploit.com for more information)


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