CVE-2022-36436

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.

How to fix CVE-2022-36436

To remediate CVE-2022-36436, upgrade the affected package to a fixed version below.

• —upgrade to 1.2.0 or later
• —upgrade to edc149af29242178091b2d6fcd42c3ef0851644b or later

Is CVE-2022-36436 being exploited?

Low — EPSS is 1.8%, meaning exploitation activity has not been observed at scale.

Affected packages (2)

• from 0, < 1.2.0
• from 0, < edc149af29242178091b2d6fcd42c3ef0851644b | from 0, < 1.2.0

CVSS scores

References (10)

• ADVISORYcert.grnet.gr/en/blog/cve-2022-36436-twisted-vnc-authentication-proxy-authentication-bypass/
• ADVISORYgithub.com/advisories/GHSA-237r-mx84-7x8c
• ADVISORYnvd.nist.gov/vuln/detail/CVE-2022-36436
• PATCHgithub.com/osuosl/twisted_vncauthproxy