A couple of week ago we were informed about a security issue in Servers Alive. We see this issue as not realy a Servers Alive issue but I'll you decide on it :-)
Synopsis ======== A privilege-escalation vulnerability exists, allowing a local non-privileged user to obtain SYSTEM. Discussion ========== Servers Alive can be run in two modes; as an application or as a service. �When run as a service, the application is permitted to interact with the desktop and runs under the context of SYSTEM. �When loading the 'Local manual' under help, the application does not drop privileges. Consequently, it is possible to assume SYSTEM privileges by: Viewing the source of the help file, which opens in Notepad. In Notepad, selecting File, Open. Launching a system utility such as cmd.exe. Impact ====== Full local compromise of the host on which Servers Alive is installed. Based on this info we did some 'research'. Our conclusions: The F1 key is calling the HELP, as developper we CAN NOT control what exactly is called (except for what help file). VB (Servers Alive is written in VB) does the calls to the help system of the operating system and does this within the context of the user running the app/service. This means that IF a service/app is running with full admin rights, that the help file is called with those same rights and that IF it's possible to call an external app from the help system that this app will also be running with those same rights. Well the help system allows you to run an external app. Issue in Servers Alive or issue within the help system?? We could remove the help from the app/service. But then again we would have to remove all alerts/checks in Servers Alive too since they could also be running a CMD.EXE (example shown above). Our only advice is that (as with any system) only authorized personel should be allowed to access the Servers Alive system. This : " Running Servers Alive as a Service When running Servers Alive as a service using the Microsoft Management Console, you can select the Local System Account option on the Properties dialog box and click the Allow Service to Interact with Desktop setting. To run Servers Alive under the system account with desktop interaction, you should carefully consider an important security issue: Any process started from within Servers Alive has the same access rights as the system administrator. You must protect the system running Servers Alive by ensuring that only users with a correct security clearance are allowed to log on to the local system. For example, an administrator installs Servers Alive on a workstation and configures the software to run as a service, using the system account with desktop interaction. A non-administrative user can log on to the workstation and see Servers Alive as an icon in the system tray. The user can open the Servers Alive Help file and click the View Source command in the Windows Help viewer. Subsequently, in the Open dialog box, the user can open and run CMD.exe. The non-administrative user can now run the command line with all the access rights as the system administrator. " Will be added to the help/doc of the next (minor) release of Servers Alive. Dirk. To unsubscribe from a list, send a mail message to [EMAIL PROTECTED] With the following in the body of the message: unsubscribe SAlive
