GLSA 202411-01: Neat VNC: Authentication Bypass

http://security.gentoo.org/

Severity:	high
Title:	Neat VNC: Authentication Bypass
Date:	11/06/2024
Bugs:	#937140
ID:	202411-01

Synopsis

A vulnerability has been discovered in Neat VNC, which can lead to authentication bypass.

Background

Neat VNC is a liberally licensed VNC server library that's intended to be fast and neat.

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
gui-libs/neatvnc	< 0.8.1	>= 0.8.1	All supported architectures

Description

Neat VNC allows remote attackers to bypass authentication via a request in which the client specifies an insecure security type such as "Type 1 - None", which is accepted even if it is not offered by the server, as originally demonstrated using a long password.

Impact

A remote attacker can opt not to use any authentication method and access the VNC server.

Workaround

There is no known workaround at this time.

Resolution

All Neat VNC users should upgrade to the latest version:

          # emerge --sync
          # emerge --ask --oneshot --verbose ">=gui-libs/neatvnc-0.8.1"

References

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-202411-01.xml

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.