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Gentoo: GLSA 202411-01 High: Neat VNC Authentication Bypass Issue

gentoo
Calendar Grey November 6, 2024
Dist Gentoo Esm H88
A critical Gentoo advisory highlights the significant Neat VNC authentication bypass flaw and its remediation efforts.
A vulnerability has been discovered in Neat VNC, which can lead to authentication bypass.

Summary

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.

Topics%20covered

Topics Covered

security advisory high severity gentoo authentication bypass neat vnc

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:
https://security.gentoo.org/glsa/202411-01
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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.

Severity: High
Title: Neat VNC: Authentication Bypass
Date: November 06, 2024
Bugs: #937140
ID: 202411-01

Topics%20covered

Topics Covered

security advisory high severity gentoo authentication bypass neat vnc

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.

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Affected Packages

Package Vulnerable Unaffected ---------------- ------------ ------------ gui-libs/neatvnc < 0.8.1 >= 0.8.1

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.