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usage VS 2008 offers Transact-SQL static code analysis to automatically review T-SQL for quality gaps and security errors Be wary of tools that simply grep for commonly misused function calls They are brain dead and cannot weed out real bugs from noise Seriously consider prohibiting the use of old C runtime buffer functions that do not bound the copy by the size of the destination buffer For example, strcpy should be replaced with strncpy (C runtime), strcpy_s (SafeCRT in Visual Studio NET 2008), or strlcpy (BSD) Employ stack execution protection On many platforms, such as Windows XP SP2, Windows Server 2003, Solaris, Linux, and OpenBSD, you can reduce the chance these attacks are successful by setting memory to not allow execution Windows XP SP2 (with appropriate hardware) and OpenBSD do this by default, but you must set this manually on Solaris Linux support is available through PaX Commercial solutions include McAfee s Entercept Mac OS X, on more recent hardware, also does this natively Use compiler tools Numerous tools can be used to detect stack overruns at runtime For example, the Microsoft Visual C++ product now has the /GS option, and for the GNU C Compiler (GCC) on Linux you can use StackShield (http://wwwangel recom/sk/stackshield/indexhtml) A couple other freeware/open-source products worth looking at are Libsafe from Avaya (http://wwwresearchavayalabscom/gcm/usa/en-us/initiatives/all/ nsrhtm&Filter=ProjectTitle:Libsafe&Wrapper=LabsProjectDetails&View= LabsProjectDetails) and ProPolice (based on StackGuard) by IBM, which is a patchset for GCC on OpenBSD, DragonFly BSD, and IPCop

Remote VNC Password U Countermeasure to strong VNC server password Guessing the server The It is important to pick a when configuring

Popularity: Simplicity: Impact: Risk Rating: 8 5 9 7

The modified vncviewer client quickly ran through a user-supplied wordlist and guessed the password of test Once the password was guessed, vncviewer connected to the remote server to allow attackers to assume complete control of the system This password guessing is extremely fast, and the VNC server does not generate any failed login messages

Heap/BSS/data overflows are a little different from stack overflows, and up until only recently they have been incredibly difficult to write Much of the security industry s eyes have been on heap-based overflows so much so that now heap-based overflows are commonplace Instead of overwriting the stack, they overwrite the heap The heap is used by programs to allocate dynamic memory at runtime There are no return function addresses to overwrite on the heap; these attacks depend on overwriting important variables or sensitive heap block structures that contain addresses If an attacker could overwrite a permission with an Access Allowed setting, he could gain unauthorized access to the service or computer system Alternatively, heap overflows can potentially

password should be at least eight characters and should not be a word or a derivative of a word in the dictionary Keep in mind, this password is the only thing standing between an attacker and your system Choose wisely!

take advantage of a function pointer stored after the overflowed buffer, allowing the attacker to overwrite the function pointer and point it to his own code This tends to be much more random than stack overflows due to the randomness of the memory layout, but don t let this fool you Many heap-based attacks have led to compromised computer systems There are numerous examples of heap overflows today, and we discuss many of them in this book One such vulnerability was found in the Titan FTP Server for Windows The Bugtraq ID is 11069 and was released August 30, 2004 The basic vulnerability is simple An attacker passes an overly long directory name to the FTP server s CWD (change working directory) command, where the directory name is greater than 20,480 bytes long This causes a heap-based buffer overrun, allowing the attacker to pass in arbitrary commands of his choosing There is at least one public proof-of-concept exploit for this vulnerability, and it can be found at http://wwwcnhonkercom When you take a look at the source code, you can see how simple and elegant the code is An old but good analysis of heap/BSS/data overflow attacks can be found at http:// wwww00w00org/files/articles/heaptuttxt

If you install VNC without any modifications, all network traffic between the client and server is unencrypted after authentication While it is arguably more difficult to sniff this traffic than, say, a telnet session, because the traffic is compressed, it is not impossible The source code for VNC is readily available, and it wouldn t take that much effort to build a dedicated VNC sniffer Thus, there is high degree of risk associated with using VNC sessions without encryption Although the initial VNC password is exchanged via a challenge response mechanism, all other traffic passes across the wire unencrypted Conceivably, an attacker may be able to monitor VNC sessions and capture passwords of other systems that users log in to while they are using VNC

The coding countermeasures for stack-based buffer overflows apply to heap-based overruns as well By checking both the size and type of input, you can ensure that only valid data is being sent to your programs Refer to the first input validation countermeasure for stack buffer overflows earlier in the chapter The more you can do to sanitize the input you receive from your end users, the more you will be able to prevent heap overflow attacks There is no better countermeasure than writing good, secure code Mitigations such as ProPolice, /GS, heap protection, and so on are simply extra defensive mechanisms, and they should not be seen as a replacement for good code

to VNC U Countermeasureare severalEavesdropping can be used to encrypt VNC traffic Fortunately, there mechanisms that