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Vulnerability Details : CVE-2020-15563

An issue was discovered in Xen through 4.13.x, allowing x86 HVM guest OS users to cause a hypervisor crash. An inverted conditional in x86 HVM guests' dirty video RAM tracking code allows such guests to make Xen de-reference a pointer guaranteed to point at unmapped space. A malicious or buggy HVM guest may cause the hypervisor to crash, resulting in Denial of Service (DoS) affecting the entire host. Xen versions from 4.8 onwards are affected. Xen versions 4.7 and earlier are not affected. Only x86 systems are affected. Arm systems are not affected. Only x86 HVM guests using shadow paging can leverage the vulnerability. In addition, there needs to be an entity actively monitoring a guest's video frame buffer (typically for display purposes) in order for such a guest to be able to leverage the vulnerability. x86 PV guests, as well as x86 HVM guests using hardware assisted paging (HAP), cannot leverage the vulnerability.
Publish Date : 2020-07-07 Last Update Date : 2021-07-21
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- CVSS Scores & Vulnerability Types

CVSS Score
4.7
Confidentiality Impact None (There is no impact to the confidentiality of the system.)
Integrity Impact None (There is no impact to the integrity of the system)
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) Denial Of Service
CWE ID 20

- Products Affected By CVE-2020-15563

# Product Type Vendor Product Version Update Edition Language
1 OS Debian Debian Linux 10.0 * * * Version Details Vulnerabilities
2 OS XEN XEN * * * * Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Debian Debian Linux 1
XEN XEN 1

- References For CVE-2020-15563

https://security.gentoo.org/glsa/202007-02
GENTOO GLSA-202007-02
https://lists.fedoraproject.org/archives/list/[email protected]/message/MXESCOVI7AVRNC7HEAMFM7PMEO6D3AUH/
FEDORA FEDORA-2020-76cf2b0f0a
http://www.openwall.com/lists/oss-security/2020/07/07/3
MLIST [oss-security] 20200707 Xen Security Advisory 319 v3 (CVE-2020-15563) - inverted code paths in x86 dirty VRAM tracking
https://www.debian.org/security/2020/dsa-4723
DEBIAN DSA-4723
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00031.html
SUSE openSUSE-SU-2020:0985
https://lists.fedoraproject.org/archives/list/[email protected]/message/VB3QJJZV23Z2IDYEMIHELWYSQBUEW6JP/
FEDORA FEDORA-2020-fbc13516af
http://xenbits.xen.org/xsa/advisory-319.html
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00024.html
SUSE openSUSE-SU-2020:0965

- Metasploit Modules Related To CVE-2020-15563

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


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