CVE-2021-42073
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.46%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 8.2 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
- EPSS
- 1.46% probability · 72th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-384
- Affected
- barrier project/barrier
- Source
- cve@mitre.org
References
- http://www.openwall.com/lists/oss-security/2021/11/02/4Exploit, 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/v2.4.0Release Notes, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/11/02/4Exploit, 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/v2.4.0Release Notes, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.