WinVNC may allow remote attacker to modify registry information to permit unauthorized access
|winvnc-modify-registry (5545)||High Risk|
WinVNC could allow a remote attacker to gain unauthorized access to the service. In the default installation, the HKEY_LOCAL_MACHINES\Software\ORL\WinVNC3\ registry key is created containing the connection password and IP restrictions. Privileges on the registry key give ful access to the Administrator and SYSTEM accounts, while the Everybody group has read and modify privileges. A remote attacker can edit the registry and delete the password value and set the "AuthRequired" key to 0 to gain complete access to the system.
No remedy available as of September 1, 2014.
- AT&T Virtual Network Computing Web site: WinVNC - The Windows NT VNC server.
- BugTraq Mailing List, Sat Nov 18 2000 - 20:48:15 CST: WinVNC 3.3.x.
- BID-1961: AT&T WinVNC Remote Desktop Default Configuration Vulnerability
- CVE-2000-1164: WinVNC installs the WinVNC3 registry key with permissions that give Special Access (read and modify) to the Everybody group, which allows users to read and modify sensitive information such as passwords and gain access to the system.
- OSVDB ID: 452: WinVNC Registry Key Permission Weakness Local Privilege Escalation
- US-CERT VU#197477: AT&T WinVNC allows user access to passwords and configuration via weak registry permissions
- AT&T WinVNC 3.3.3 and prior
Nov 19, 2000
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