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Vulnerability Details : CVE-2020-15566

An issue was discovered in Xen through 4.13.x, allowing guest OS users to cause a host OS crash because of incorrect error handling in event-channel port allocation. The allocation of an event-channel port may fail for multiple reasons: (1) port is already in use, (2) the memory allocation failed, or (3) the port we try to allocate is higher than what is supported by the ABI (e.g., 2L or FIFO) used by the guest or the limit set by an administrator (max_event_channels in xl cfg). Due to the missing error checks, only (1) will be considered an error. All the other cases will provide a valid port and will result in a crash when trying to access the event channel. When the administrator configured a guest to allow more than 1023 event channels, that guest may be able to crash the host. When Xen is out-of-memory, allocation of new event channels will result in crashing the host rather than reporting an error. Xen versions 4.10 and later are affected. All architectures are affected. The default configuration, when guests are created with xl/libxl, is not vulnerable, because of the default event-channel limit.
Publish Date : 2020-07-07 Last Update Date : 2020-07-27
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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)
CWE ID 755

- Products Affected By CVE-2020-15566

# 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-2020-15566

http://xenbits.xen.org/xsa/advisory-317.html
http://www.openwall.com/lists/oss-security/2020/07/07/2
MLIST [oss-security] 20200707 Xen Security Advisory 317 v3 (CVE-2020-15566) - Incorrect error handling in event channel port allocation
https://www.debian.org/security/2020/dsa-4723
DEBIAN DSA-4723
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00024.html
SUSE openSUSE-SU-2020:0965
https://lists.fedoraproject.org/archives/list/[email protected]/message/VB3QJJZV23Z2IDYEMIHELWYSQBUEW6JP/
FEDORA FEDORA-2020-fbc13516af
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/MXESCOVI7AVRNC7HEAMFM7PMEO6D3AUH/
FEDORA FEDORA-2020-76cf2b0f0a
https://security.gentoo.org/glsa/202007-02
GENTOO GLSA-202007-02

- Metasploit Modules Related To CVE-2020-15566

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


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