CVE-2022-36436

OSU Open Source Lab VNCAuthProxy through 1.1.1 is affected by an vncap/vnc/protocol.py VNCServerAuthenticator authentication-bypass vulnerability that could allow a malicious actor to gain unauthorized access to a VNC session or to disconnect a legitimate user from a VNC session. A remote attacker with network access to the proxy server could leverage this vulnerability to connect to VNC servers protected by the proxy server without providing any authentication credentials. Exploitation of this issue requires that the proxy server is currently accepting connections for the target VNC server.

Weakness

When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.

Affected Software

Potential Mitigations

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/114.html
• https://cwe.mitre.org/data/definitions/115.html
• https://cwe.mitre.org/data/definitions/151.html
• https://cwe.mitre.org/data/definitions/194.html
• https://cwe.mitre.org/data/definitions/22.html
• https://cwe.mitre.org/data/definitions/57.html
• https://cwe.mitre.org/data/definitions/593.html
• https://cwe.mitre.org/data/definitions/633.html
• https://cwe.mitre.org/data/definitions/650.html
• https://cwe.mitre.org/data/definitions/94.html

References

• https://cert.grnet.gr/en/blog/cve-2022-36436-twisted-vnc-authentication-proxy-authentication-bypass/
• https://github.com/osuosl/twisted_vncauthproxy/commit/edc149af29242178091b2d6fcd42c3ef0851644b
• https://github.com/osuosl/twisted_vncauthproxy/tree/release/1.1.1
• https://pypi.org/project/VNCAuthProxy/
• https://cert.grnet.gr/en/blog/cve-2022-36436-twisted-vnc-authentication-proxy-authentication-bypass/
• https://github.com/osuosl/twisted_vncauthproxy/commit/edc149af29242178091b2d6fcd42c3ef0851644b
• https://github.com/osuosl/twisted_vncauthproxy/tree/release/1.1.1
• https://pypi.org/project/VNCAuthProxy/