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6.5
MEDIUM CVSS 3.1
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 :

Nov. 21, 2024, 6 a.m.

Remotely Exploit :

No

Source :

[email protected]
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.

ID Vendor Product Action
1 Linux linux_kernel
1 Debian debian_linux
1 Xen xen
: Total Affected Vendor : 3 | Products : 3
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 2.0 LOW [email protected]
CVSS 3.1 MEDIUM [email protected]
Solution
This vulnerability can be mitigated by updating the affected kernel and Linux packages.
  • Update the affected kernel packages.
  • Update the affected Linux packages.
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.

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
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
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.

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).

Profile Photo
vincent-deng/veracode-container-security-finding-parser

Map Vulnerabilities into Different Layers of the Container Image

Python

Updated: 2 years, 7 months ago
1 stars 1 fork 1 watcher
Born at : Oct. 5, 2022, 12:07 p.m. This repo has been linked 1277 different CVEs too.

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.

Results are limited to the first 20 news articles due to potential performance issues.

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 af854a3a-2127-422b-91ae-364da2661108

    Nov. 21, 2024

    Action Type Old Value New Value
    Added Reference https://lists.debian.org/debian-lts-announce/2022/03/msg00011.html
    Added Reference https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html
    Added Reference https://www.debian.org/security/2022/dsa-5050
    Added Reference https://www.debian.org/security/2022/dsa-5096
    Added Reference https://xenbits.xenproject.org/xsa/advisory-391.txt
  • 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:-:*:*:*:*:*:*:*
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
Base CVSS Score: 6.5
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact
Base CVSS Score: 2.1
Access Vector
Access Complexity
Authentication
Confidentiality Impact
Integrity Impact
Availability Impact
Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.05 }} 0.02%

score

0.14242

percentile