CVE-2021-42073
"Barrier Unnamed Client Label Vulnerability (privilege escalation)"
Description
An issue was discovered in Barrier before 2.4.0. An attacker can enter an active session state with the barriers component (aka the server-side implementation of Barrier) simply by supplying a client label that identifies a valid client configuration. This label is "Unnamed" by default but could instead be guessed from hostnames or other publicly available information. In the active session state, an attacker can capture input device events from the server, and also modify the clipboard content on the server.
INFO
Published Date :
Nov. 8, 2021, 4:15 a.m.
Last Modified :
Nov. 21, 2024, 6:27 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 2.0 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
CVE-2021-42073 vulnerability.
Public PoC/Exploit Available at Github
CVE-2021-42073 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-2021-42073.
| URL | Resource |
|---|---|
| http://www.openwall.com/lists/oss-security/2021/11/02/4 | Exploit Mailing List Third Party Advisory |
| https://github.com/debauchee/barrier/commit/229abab99f39f11624e5651f819e7f1f8eddedcc | |
| https://github.com/debauchee/barrier/commit/b5adc93e2bd74cb094f91ff595c07f321a489f3e | |
| https://github.com/debauchee/barrier/releases/tag/v2.4.0 | Release Notes Third Party Advisory |
| http://www.openwall.com/lists/oss-security/2021/11/02/4 | Exploit Mailing List Third Party Advisory |
| https://github.com/debauchee/barrier/commit/229abab99f39f11624e5651f819e7f1f8eddedcc | |
| https://github.com/debauchee/barrier/commit/b5adc93e2bd74cb094f91ff595c07f321a489f3e | |
| https://github.com/debauchee/barrier/releases/tag/v2.4.0 | Release Notes Third Party 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-2021-42073 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-2021-42073
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).
None
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-2021-42073 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-42073 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 http://www.openwall.com/lists/oss-security/2021/11/02/4 Added Reference https://github.com/debauchee/barrier/commit/229abab99f39f11624e5651f819e7f1f8eddedcc Added Reference https://github.com/debauchee/barrier/commit/b5adc93e2bd74cb094f91ff595c07f321a489f3e Added Reference https://github.com/debauchee/barrier/releases/tag/v2.4.0 -
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
CVE Modified by [email protected]
Nov. 13, 2023
Action Type Old Value New Value Added Reference MITRE https://github.com/debauchee/barrier/commit/b5adc93e2bd74cb094f91ff595c07f321a489f3e [No types assigned] Added Reference MITRE https://github.com/debauchee/barrier/commit/229abab99f39f11624e5651f819e7f1f8eddedcc [No types assigned] -
Initial Analysis by [email protected]
Nov. 09, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:M/Au:N/C:P/I:P/A:N) Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N Changed Reference Type http://www.openwall.com/lists/oss-security/2021/11/02/4 No Types Assigned http://www.openwall.com/lists/oss-security/2021/11/02/4 Exploit, Mailing List, Third Party Advisory Changed Reference Type https://github.com/debauchee/barrier/releases/tag/v2.4.0 No Types Assigned https://github.com/debauchee/barrier/releases/tag/v2.4.0 Release Notes, Third Party Advisory Added CWE NIST CWE-384 Added CPE Configuration OR *cpe:2.3:a:barrier_project:barrier:*:*:*:*:*:*:*:* versions up to (excluding) 2.4.0
Vulnerability Scoring Details
Base CVSS Score: 8.2
Base CVSS Score: 5.8
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.61 }} 0.03%
score
0.68567
percentile