SB2022011217 - Multiple vulnerabilities in Apache Guacamole

Description

This security bulletin contains information about 2 vulnerabilities.

1) Improper Authorization (CVE-ID: CVE-2021-43999)

CWE-ID: CWE-285 - Improper Authorization

CVSSv4: 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

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.

2) Information disclosure (CVE-ID: CVE-2021-41767)

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

CVSSv4: 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

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.

Remediation

Install update from vendor's website.

References

• https://lists.apache.org/thread/4dt9h5mo4o9rxlgxm3rp8wfqdtdjn2z9
• http://www.openwall.com/lists/oss-security/2022/01/11/7
• https://lists.apache.org/thread/5l31k4jmzdsfz0xt8osrbl878gb3b7ro
• http://www.openwall.com/lists/oss-security/2022/01/11/6