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ControlIT from Computer Associates (http://wwwcaicom) is a well-known and frequently used product, but it offers the least in terms of security features Besides the product s early problems with cleartext usernames and passwords, even their latest version poorly encrypts the passwords, leaving them open to attack They do not offer strong passwords and password-protected profiles and setup files, and they do not log failed login attempts Also, they are vulnerable to the Revelation password problem
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Along with pcAnywhere, Timbuktu Pro 32 from Netopia (http://wwwnetopiacom) is another frequently used remote control application in larger corporate environments Similar to most other such products, Timbuktu offers all the usual remote control options, with a couple of extras The product provides screen sharing between multiple users at the same time and some solid security features such as minimum password length, password reuse, alternate authentication, and password expiration Best of all, it is not vulnerable to the usual Revelation password problem Timbuktu is a formidable remote control product
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Virtual Network Computing (VNC)
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Virtual Network Computing is from the AT&T Research Labs, Cambridge, England, and can be found at http://wwwukresearchattcom/vnc VNC offers many unique features The first is its cross-platform capability The product can be installed on Windows, Linux, and Solaris desktops and can be viewed by Windows, Linux, Solaris, Macintosh, and yes, even Windows CE devices The product also has a Java interface that can be viewed in any Java-capable browser, such as Netscape s Communicator and Microsoft s Internet Explorer Best of all, VNC is free! With the wealth of features and functionality that VNC provides, it should not be a surprise that there are some serious security implications of running VNC It does fall victim to the Revelation password problem We also demonstrated in 5 how easy VNC is to install on Windows NT over a remote network connection all that needs to be done is to install the VNC service via the command line after making a single edit to the
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remote Registry to ensure the service starts invisibly (versions greater than 332 will show up in the system tray and be visible to users interactively logged on) WinVNCEXE shows up in the Process List no matter what version or mode, of course More importantly, however, it is vulnerable to the following attacks: M I L Brute forcing VNC passwords Weak passwords may allow an attacker to gain complete control of the system running the VNC server Network eavesdropping By default, VNC does not use any sort of encryption after a user authenticates to the VNC server Weak WinVNC password obfuscation WinVNC stores the server password in an obfuscated fashion that may allow an attacker to recover the cleartext server password
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We will discuss these attacks next
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The main security mechanism that protects the VNC server from unauthorized access is the password chosen by the system administrator As we have mentioned many times throughout this book, weak passwords are one of the easiest vulnerabilities for an attacker to exploit Since VNC is often run with privileged access, determined attackers will hit pay dirt if they are able to brute force a VNC server password One such mechanism that can be used to brute force VNC passwords is a patch that can be applied to the VNC client software vncviewer The rfbprotoc brute force patch can be found at http://wwwsecuriteamcom/tools/Brute_forcing_VNC_passwordshtml This patch must be applied against the vnc-333r1_unixsrctgz package using the patch command Let s take a look at how trivial it is to brute force VNC servers
[crush]# vncviewer 1921681101 VNC server supports protocol version 33 (viewer 33) Trying password '#!comment:' VNC authentication failed Trying password 'Common' VNC authentication failed Trying password 'passwords,' VNC authentication failed Trying password 'compiled' VNC authentication failed Trying password 'passwd' VNC authentication failed Trying password 'test' VNC authentication succeeded Desktop name "twistervm" Connected to VNC server, using protocol version 33
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