CVE-2020-15566
Xen Event Channel Port Allocation Crash Vulnerability
Description
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.
INFO
Published Date :
July 7, 2020, 1:15 p.m.
Last Modified :
Nov. 7, 2023, 3:17 a.m.
Source :
[email protected]
Remotely Exploitable :
No
Impact Score :
4.0
Exploitability Score :
2.0
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2020-15566.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2020-15566 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2020-15566 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
CVE Modified by [email protected]
Nov. 07, 2023
Action Type Old Value New Value Added Reference MITRE https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VB3QJJZV23Z2IDYEMIHELWYSQBUEW6JP/ [No types assigned] Added Reference MITRE https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MXESCOVI7AVRNC7HEAMFM7PMEO6D3AUH/ [No types assigned] Removed Reference MITRE https://lists.fedoraproject.org/archives/list/[email protected]/message/VB3QJJZV23Z2IDYEMIHELWYSQBUEW6JP/ Removed Reference MITRE https://lists.fedoraproject.org/archives/list/[email protected]/message/MXESCOVI7AVRNC7HEAMFM7PMEO6D3AUH/ -
CWE Remap by [email protected]
Jul. 12, 2022
Action Type Old Value New Value Changed CWE CWE-755 CWE-754 -
CPE Deprecation Remap by [email protected]
Aug. 18, 2020
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:o:debian:debian_linux:10:*:*:*:*:*:*:* OR *cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* -
CVE Modified by [email protected]
Jul. 27, 2020
Action Type Old Value New Value Added Reference https://security.gentoo.org/glsa/202007-02 [No Types Assigned] -
CVE Modified by [email protected]
Jul. 23, 2020
Action Type Old Value New Value Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/MXESCOVI7AVRNC7HEAMFM7PMEO6D3AUH/ [No Types Assigned] -
CVE Modified by [email protected]
Jul. 18, 2020
Action Type Old Value New Value Added Reference http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00031.html [No Types Assigned] -
CVE Modified by [email protected]
Jul. 16, 2020
Action Type Old Value New Value Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/VB3QJJZV23Z2IDYEMIHELWYSQBUEW6JP/ [No Types Assigned] -
CVE Modified by [email protected]
Jul. 15, 2020
Action Type Old Value New Value Added Reference http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00024.html [No Types Assigned] -
Initial Analysis by [email protected]
Jul. 15, 2020
Action Type Old Value New Value Added CVSS V2 NIST (AV:L/AC:M/Au:N/C:N/I:N/A:C) Added CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H Changed Reference Type http://www.openwall.com/lists/oss-security/2020/07/07/2 No Types Assigned http://www.openwall.com/lists/oss-security/2020/07/07/2 Mailing List, Third Party Advisory Changed Reference Type http://xenbits.xen.org/xsa/advisory-317.html No Types Assigned http://xenbits.xen.org/xsa/advisory-317.html Vendor Advisory Changed Reference Type https://www.debian.org/security/2020/dsa-4723 No Types Assigned https://www.debian.org/security/2020/dsa-4723 Third Party Advisory Added CWE NIST CWE-755 Added CPE Configuration OR *cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:* versions from (including) 4.10.0 up to (including) 4.13.1 Added CPE Configuration OR *cpe:2.3:o:debian:debian_linux:10:*:*:*:*:*:*:* -
CVE Modified by [email protected]
Jul. 13, 2020
Action Type Old Value New Value Added Reference https://www.debian.org/security/2020/dsa-4723 [No Types Assigned] -
CVE Modified by [email protected]
Jul. 07, 2020
Action Type Old Value New Value Added Reference http://www.openwall.com/lists/oss-security/2020/07/07/2 [No Types Assigned]
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2020-15566 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2020-15566
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.04 }} 0.00%
score
0.12065
percentile