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T:m_CancelPtr = 0 W:Set m_Me = Nothing W:End Sub This ordering of the code runs fine because m_CancelPtr is modified before the Worker class that owns the memory is released However, in the following ordering, there's an obvious problem T:If m_CancelPtr Then T:If Not Is Empty (m_ReturnData) Then W:CopyMemory ByVal m_ReturnDataPtr, ByVal VarPtr(Data), 16 W:CopyMemory ByVal VarPtr(Data), 0, 2 W:Set m_Me = Nothing W:End Sub T:InterlockedIncrement m_CancelPtr T:m_CancelPtr = 0 The code crashes on the InterlockedIncrement line when run in this order because the memory for the Worker instance that owns m_CancelPtr has been freed In order to handle this type of condition, you must explicitly synchronize these blocks of code to eliminate the chance of running code from two threads in an order that might crash You can solve the synchronization problem with a Win32 critical section object to guarantee that m_CancelPtr is not accessed after it is released A critical section variable adds less overhead to the system than mutexes or event objects because critical sections work only in a single process A critical section object, once initialized, can be entered with EnterCriticalSection The first EnterCriticalSection call establishes ownership of the synchronization object Subsequent EnterCriticalSection requests against the same object are blocked until the first thread that entered the critical section calls LeaveCriticalSection Critical-section synchronization, like all mechanisms that block threads, should be avoided whenever possible because blocking hurts overall performance This is one case, however, where some sort of synchronization is required The critical section is owned by the Controller object and used by the Worker and ThreadData objects All the APIs used here are declared in the provided ThreadAPlOlb (VBoost: API declares used for threading)

LogHandler,

Bluesnarfer/Bluesnarfing This utility/procedure is where Bluetooth security starts to get serious. Basically, Bluesnarfing enables a hacker to connect to a Bluetooth cell phone and access and modify data. The utility can read and search through phonebook entries, gather device info, delete phonebook entries, and more. Figure 9.12 shows the various options available in the Bluesnarfer utility.

To make INVOKERS and INVOCATION INTERCEPTORS work in handler chains as described above, one more pattern is used that is of particular importance in the architecture. An INVOCATION CONTEXT (called the MessageContext in Axis) has to be created first, before the message is sent through the handler chain. In this way different handlers can retrieve the data of the message and can potentially manipulate it. In Axis, the INVOCATION CONTEXT class MessageContext associates with the message object, which itself aggregates the message parts (such as SOAP parts

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' Controller Private m_CritSect As CRITICAL_SECTION Private Sub Class_Initialize() InitializeCriticalSection VarPtr(m_CritSect) End Sub Private Sub Class_Terminate() DeleteCriticalSection VarPtr(m_CritSect) End Sub Friend Function CritSect() As Long CritSect = VarPtr(m_CritSect) End Function

BlueBug This allows an attacker to create a serial connection to a cell phone via the Bluetooth interface. With this type of connection, commands can be executed and the device is highly compromised messages can be read, and calls can be made and intercepted. BlueSmac This enables a hacker to change the hardware address of their Bluetooth adapter. This can be useful in spoofing paired devices. BackDoor This enables a device to be paired to another device without the pairing being visible on the cell phone. Therefore, a connection can be established to the cell phone at any time and the cell-phone user may never know that it is taking place.

24.09.2004 21:09

' Worker Private m_pCritSect As Long Public Function DoStuff( _ Data As Variant, ByVal ProgressPtr As Long, _ ByVal ReturnDataPtr As Long, ByVal CritSectPtr As Long) 'Same as before m_pCritSect = CritSectPtr End Function Private Sub FireTimer_Go() 'Same as before Finish: 'Transfer the memory to the DataPtr EnterCriticalSection m_pCritSect CopyMemory ByVal m_ReturnDataPtr, ByVal VarPtr(Data), 16 CopyMemory ByVal VarPtr(Data), 0, 2 'We're done Release ourselves and exit Set m_Me = Nothing LeaveCriticalSection m_pCritSect End Sub 'ThreadData class Friend Sub CancelWorker() 'Signal if we haven't signalled before If m_CancelPtr Then EnterCriticalSection m_ParentCritSect If Not IsEmpty(m_ReturnData) Then InterlockedIncrement m_CancelPtr End If m_CancelPtr = 0

If there s a good thing about Bluesnarfing and some of the other attacks, it s that not every phone is susceptible to them. Table 9.1 is a chart available at http://www.thebunker.net/resources/bluetooth that shows the make and model of phones that are susceptible to various types of attacks.

Web Services Technology Projection and attachments). The corresponding class structure is illustrated in the following figure.

Here an INVOCATION CONTEXT is used on both the client and the server side. Each message context object is associated with two message objects, one for the request message and one for the response message. The MessageContext class stores the invocation data of the message, such the target service identifier and the operation name, as well as the context information, such as a session object (if required by the service), the transport protocol name, and authentication information (user name, password, and so on). The last handler in the client side handler chain (the sender) and the provider in the server side handler chain are also called pivot points , because they turn the message from a request into a reply. A flag havePassedPivot on the MessageContext indicates whether this pivot point has been reached. That is, each handler can discover, using a method getPastPivot, whether it is currently processing a request or a reply. Let us consider the predefined class LogHandler as an example of a handler class. It is implemented as follows:

Table 9.1: Vulnerability Matrix (* = NOT Vulnerable) FIRMWARE 20R1B 20R2A013 20R2B013 20R2F004 Yes 20R2G 20R1B 20R2A013 20R2B013 20R2F004 20R5C001 Yes 20R1A081 20R1L013 20R3C002 20R4C003 20R4D001 Yes Yes 20R1A081 20R2C007 20R2F002 20R5B001 Yes No No No BACKDOOR SNARF WHEN VISIBLE SNARF WHEN NOT VISIBLE BUG

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