Over the past decade, Microsoft, the target of choice for many online attackers, has hardened its operating system, adopting technologies designed to make it harder for attackers to find and exploit vulnerabilities. Apple and many other software makers have followed suit, introducing similar additional security measures to their operating systems.
Yet last week, during the “Pwn2Own contest” at CanSecWest, a security conference in Vancouver, Canada, security researchers demonstrated that software makers need to do more to protect their programs. Using previously unknown vulnerabilities, the researchers were able to compromise Apple’s Safari, Microsoft’s Internet Explorer 8, and Mozilla’s Firefox Web browsers by circumventing the latest security technologies in place in the operating system underneath.
“These things make it hard–they really do,” says Charles Miller, a principal analyst at Independent Security Evaluators and the researcher who circumvented the security of Apple’s Safari browser and the Mac OS X Snow Leopard operating system underneath. “But, no matter what, a determined attacker can find a way in.”
The results of the Pwn2Own contest underscore a truism in security: Defenders must be right all the time, but attackers only have to be right once. “The exploits are really creative; that’s why they are tricky,” Aaron Portnoy, security research team lead for TippingPoint, the security firm that sponsors the Pwn2Own competition.
Starting with its Trustworthy Computing Initiative in 2002, Microsoft began implementing a series of security technologies in Windows. First, the company protected “the stack”–the logical memory space used by programs to temporarily hold data. A technology called the “/GS flag” (after the software switch used in the company’s compiler), prevented attackers from pushing their own code to the stack. But in 2003, David Litchfield, an independent researcher, demonstrated a way around the protection. Microsoft reacted by rolling out two more technologies: SafeSEH to address the attack using structured exception handlers (SEH), and address space layout randomization (ASLR), to make similar vulnerabilities more difficult to exploit in the future. Researchers have, however, found ways around both those protections.
Most recently, Microsoft brought out another technology, data execution protection (DEP), which prevents attacks that overwrite memory with code and then try to execute that code. But earlier this year, an independent researcher, Dion Blazakis, showed off an attack, known as JIT spraying, that uses vulnerabilities in other programs–most notably Adobe Flash and Sun’s Java–to bypass those protections.
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