Title: VNC Server Weak Password Encryption Vulnerability
Severity: HIGH
Description:
AT&T's VNC (Virtual network Computing) package is similar to Xwindows in that it is a remote, graphical interface. It is freeware, available from AT&T Cambridge.
The authentication system used by VNC uses a weak encryption algorithm that can be easily brute-forced. A static key is used, and all passwords are truncated to 8 characters. If the encrypted passwords can be obtained, it would be trivial to decrypt them.
In the NT version of VNC, encrypted passwords are kept in the
\HKEY_CURRENT_USER\Software\ORL\WinVNC3
and
\HKEY_USERS\.DEFAULT\SOftware\ORL\WinVNC3
registry keys, and 3DES encrypted with the key 23 82 107 6 35 78 88 7.
Affected Products:
- AT&T VNC 3.3.0.x
References:
- AT&T Laboratories Cambridge: Virtual Network Computing
- Roses Labs: Roses Labs Security Advisory
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