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avoid asking the kernel for the initial reference and simply guess handle values After guessing a valid handle value, the attacker can close the handle, which may cause applications using the handle to crash In fact, some poorly written applications do this accidently today by not properly initializing handle values To prevent a Normal-level process from affecting Privileged-level processes, the object modification APIs check the process s trust level before performing the requested operation on the handle s resource These time-of-use checks stop low-privileged processes from inappropriately accessing privileged objects, but they do not stop malicious applications from fabricating handle values and passing those handles to higher privileged processes If the attacker s application changes the object referred to by the handle, the privileged application may perform a privileged action on an unexpected object Unfortunately, this attack cannot be prevented with the shared handle table architecture (refer to http://msdnmicrosoftcom/en-us/library/bb202793aspx) Windows CE 60 removes the shared handle table and implements a per-process handle table Handle values are no longer valid across processes, and it is not possible to fabricate handles by guessing Therefore, attackers cannot cause handle-based denial-of-service conditions or elevate privileges by guessing handle values and passing them to higher privilege processes Remember that Windows Mobile does not support assigning ACLs to individual objects Therefore, any process, regardless of trust level, can open almost any object To protect certain key system objects, Windows Mobile maintains a blacklist of objects that cannot be written to by unprivileged processes This rudimentary system of object protection is decent, but much data is not protected More detail is contained within the Permissions and User Controls section of this chapter
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Kernel Mode and User Mode
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There are two primary modes of execution on Windows CE 5x devices: user mode and kernel mode The current execution mode is managed on a per-thread basis, and privileged threads can change their mode using the SetKMode() function Once a thread is running in kernel mode, the thread can access kernel memory; this is memory in the kernel s address space above 0x8000000 Accessing kernel memory is a highly privileged operation because the device s security relies on having a portion of memory that not all processes can modify Contained within this memory is information about the current state of the device, including security policy, file system, encryption keys, and hardware device information Reading or modifying any of this memory completely compromises the security of the device
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4: Windows Mobile Security
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The concept of kernel mode and user mode is not unique to Windows Mobile most operating systems have a privileged execution mode Normally the OS uses special processor instructions to enter and exit kernel mode Windows Mobile differs because the actual processor execution mode never changes Windows Mobile only changes the individual thread s memory mapping to provide a view of all memory when the thread enters kernel mode Application threads most often run in user mode User mode threads do not have total access to the device and must leverage kernel services to accomplish most of their work For example, a user mode thread wishing to use the file system must send a request through the kernel (nkexe) to the file system process (FileSysexe) The request is carried out by using Windows CE s system call (syscall) mechanism Each system API is assigned a unique number that will be used to redirect the system call to the portion of system code responsible for carrying out the work In many cases, this code is actually implemented in a separate process The entire syscall mechanism works as follows:
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1 An application thread calls a system API (for example, CreateFile) 2 The CreateFile method is implemented as a Thunk, which loads the unique
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number that identifies this call to the system This number is a 32-bit number representing an invalid memory address
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