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Exploiting Microsoft SMB Driver

June 16th, 2006

“Client Side Caching” aka “Offline Files” provides to Windows 2000 and Windows XP (Windows Vista?) the proper infrastructure which facilitates a seamless operation across connectivity states between client and remote server.

It is employed to safeguard the user and the client applications across connectivity interruptions ,bandwidth changes, etc. This is accomplished in part by caching the desirable file or files together with the appropriate protocol information to a local data store. It is located in the hidden “%systemroot%csc” directory . In addition, access rights and share access rights are also cached.

The CSC directory contains all offline files that are requested by any user on the computer. The database mimics the network resource while it is offline so that files are accessed as though the network resource is still available. File permissions and system permissions on the files are preserved.

For example, a Microsoft® Word document created by Bob, given a password, and saved to a share on which only Bob has Full Control, cannot be opened from the CSC directory by Alice, because she has neither the share permissions to open the file nor the password required to open the file in Microsoft Word. You can also maintain the security of sensitive files by using Encrypting File System (EFS) to encrypt the Offline Files cache.

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