Vulnerability identifier: #VU59552

Vulnerability risk: Medium

CVSSv3.1: 4.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-41767

CWE-ID: CWE-200

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Guacamole
Server applications / Remote management servers, RDP, SSH

Vendor: Apache Foundation

Description

The vulnerability allows a remote user to bypass implemented security restrictions.

The vulnerability exists due to the application includes a private tunnel identifier in the non-private details of some REST responses. A remote user can obtain the private tunnel identifier and use it to interact with another user's active use of that same connection.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Guacamole: 0.8.3 - 1.3.0

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External links
http://lists.apache.org/thread/5l31k4jmzdsfz0xt8osrbl878gb3b7ro
http://www.openwall.com/lists/oss-security/2022/01/11/6

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.