CVE-2021-28711
Xen Rogue Backend DoS Vulnerability
Description
Rogue backends can cause DoS of guests via high frequency events T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Xen offers the ability to run PV backends in regular unprivileged guests, typically referred to as "driver domains". Running PV backends in driver domains has one primary security advantage: if a driver domain gets compromised, it doesn't have the privileges to take over the system. However, a malicious driver domain could try to attack other guests via sending events at a high frequency leading to a Denial of Service in the guest due to trying to service interrupts for elongated amounts of time. There are three affected backends: * blkfront patch 1, CVE-2021-28711 * netfront patch 2, CVE-2021-28712 * hvc_xen (console) patch 3, CVE-2021-28713
INFO
Published Date :
Jan. 5, 2022, 5:15 p.m.
Last Modified :
April 6, 2022, 4:18 p.m.
Source :
[email protected]
Remotely Exploitable :
No
Impact Score :
4.0
Exploitability Score :
2.0
Public PoC/Exploit Available at Github
CVE-2021-28711 has a 1 public PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
Affected Products
The following products are affected by CVE-2021-28711
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
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-2021-28711.
| URL | Resource |
|---|---|
| https://lists.debian.org/debian-lts-announce/2022/03/msg00011.html | Third Party Advisory |
| https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html | Third Party Advisory |
| https://www.debian.org/security/2022/dsa-5050 | Third Party Advisory |
| https://www.debian.org/security/2022/dsa-5096 | Third Party Advisory |
| https://xenbits.xenproject.org/xsa/advisory-391.txt | Patch Vendor Advisory |
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).
Map Vulnerabilities into Different Layers of the Container Image
Python
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-28711 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-28711 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 -
Modified Analysis by [email protected]
Apr. 06, 2022
Action Type Old Value New Value Changed Reference Type https://lists.debian.org/debian-lts-announce/2022/03/msg00011.html No Types Assigned https://lists.debian.org/debian-lts-announce/2022/03/msg00011.html Third Party Advisory Changed Reference Type https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html No Types Assigned https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html Third Party Advisory Changed Reference Type https://www.debian.org/security/2022/dsa-5050 No Types Assigned https://www.debian.org/security/2022/dsa-5050 Third Party Advisory Changed Reference Type https://www.debian.org/security/2022/dsa-5096 No Types Assigned https://www.debian.org/security/2022/dsa-5096 Third Party Advisory Added CPE Configuration OR *cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* *cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* *cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* -
CVE Modified by [email protected]
Mar. 10, 2022
Action Type Old Value New Value Added Reference https://www.debian.org/security/2022/dsa-5096 [No Types Assigned] Added Reference https://lists.debian.org/debian-lts-announce/2022/03/msg00011.html [No Types Assigned] Added Reference https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html [No Types Assigned] -
CVE Modified by [email protected]
Jan. 21, 2022
Action Type Old Value New Value Added Reference https://www.debian.org/security/2022/dsa-5050 [No Types Assigned] -
Initial Analysis by [email protected]
Jan. 18, 2022
Action Type Old Value New Value Added CVSS V2 NIST (AV:L/AC:L/Au:N/C:N/I:N/A:P) Added CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H Changed Reference Type https://xenbits.xenproject.org/xsa/advisory-391.txt No Types Assigned https://xenbits.xenproject.org/xsa/advisory-391.txt Patch, Vendor Advisory Added CWE NIST NVD-CWE-noinfo Added CPE Configuration OR *cpe:2.3:o:xen:xen:-:*:*:*:*:*:*:*
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-28711 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-2021-28711
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.06 }} 0.02%
score
0.25770
percentile