Auth bypass in Osuosl Twisted Vnc Authentication Proxy
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.
Vulnerability class: Broken Authentication
EPSS: 0.017 (75.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Osuosl Twisted_vnc_authentication_proxy
- N/a — versions n/a
Weakness classification (CWE)
Public proof-of-concept exploits
References
- cve@mitre.org (x_refsource_MISC, Release Notes)
- cve@mitre.org (Product, x_refsource_MISC)
- cve@mitre.org (Patch, x_refsource_MISC)
- cve@mitre.org (Exploit, Patch, x_refsource_MISC)
Frequently asked questions
- What is CVE-2022-36436?
- CVE-2022-36436 is a critical-severity vulnerability in Osuosl Twisted Vnc Authentication Proxy, classified under Improper Authentication. CVSS score: 9.8/10. Published 2022-09-14.
- How severe is CVE-2022-36436?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2022-36436 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.