#VU59553 Improper Authorization in Guacamole - CVE-2021-43999

Vulnerability identifier: #VU59553

Vulnerability risk: Medium

CVSSv4.0: 1.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-43999

CWE-ID: CWE-285

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 authorization process.

The vulnerability exist  due to improper validation responses, received from a SAML identity provider. A remote user can assume identity of another Guacamole user, is SAML support is enabled.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Guacamole: 1.2.0 - 1.3.0

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External links
https://lists.apache.org/thread/4dt9h5mo4o9rxlgxm3rp8wfqdtdjn2z9
https://www.openwall.com/lists/oss-security/2022/01/11/7

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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.