Check_MK suffers from an arbitrary file disclosure vulnerability.
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LSE discovered that the installer of the Information Enterprise Server (IES) was available to unauthenticated users over HTTP. When updating from previous versions of IES, an installation form was not disabled after installation. In this case the servlet "/ies/install" was exposed to unauthenticated users. By accessing the servlet at URI "/ies/install/" on an affected IES server, an unauthenticated attacker was able to set a new password for the manager account. Additionally sensitive information regarding the IES installation was displayed.
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