CVEvulnerability
CVE-2021-42073
8.2 HIGH
Official page ↗
- Status
- Modified
- Published
- 2021-11-08
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 8.2 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
- CVSS 2.0 ([email protected])
- 5.8 MEDIUM — AV:N/AC:M/Au:N/C:P/I:P/A:N
- Weaknesses
- CWE-384
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.
Affected configurations
• barrier project barrier (< 2.4.0)
Related
Weakness · CWE (1)
- CWE-384 Session Fixation weakness
References
- http://www.openwall.com/lists/oss-security/2021/11/02/4 Exploit, Mailing List, Third Party Advisory
- https://github.com/debauchee/barrier/commit/229abab99f39f11624e5651f819e7f1f8eddedcc github.com
- https://github.com/debauchee/barrier/commit/b5adc93e2bd74cb094f91ff595c07f321a489f3e github.com
- 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 github.com
- https://github.com/debauchee/barrier/commit/b5adc93e2bd74cb094f91ff595c07f321a489f3e github.com
- https://github.com/debauchee/barrier/releases/tag/v2.4.0 Release Notes, Third Party Advisory