Vulnerability · Published Sep 14, 2022 · Assigned by mitre

CVE-2022-36436

Critical 9.8

In plain English

A critical-severity improper authentication in the vncauthproxy package (PyPI). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 2.1% (higher than 82% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)9.8Critical

Exploit odds (30 days)2.1%top 18.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	vncauthproxy	1.2.0	GHSA-237r-mx84-7x8c
PyPI	vncauthproxy	1.2.0	PYSEC-2022-267

Affected products (as reported)

Vendor	Product	Versions
n/a	n/a	n/a

Weakness: CWE-287 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

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