In their hurry to implement web services, some companies may be exposing themselves to new security risks that they may not fully understand, according to a US security researcher.
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During a presentation at the CanSecWest/core06 conference in Vancouver, researcher Alex Stamos explained how a number of web services technologies, including the XQuery query language, could be exploited by hackers to dig up secret information and attack systems.
Web services describes a form of distributed computing that uses standards based on XML to simplify programming software, based on the idea that web services applications are extremely portable and can interact with different types of software.
Stamos described an attack whereby a user could enter malicious code into a web form and get that code to run by calling up the company's customer service number and tricking a representative into inadvertently executing it.
Web services requests can be used to conduct denial of service attacks, either by creating malicious XML queries that use massive amounts of memory or by bombarding databases applications with more requests than they can handle.
Web application suppliers have created tools that hide complexity, making it easy to create web services. Unfortunately, the tools also make it easy for their users to ignore the security implications of the software they're building.
Web services security has largely been brushed over in the rush to adopt the technology, but there is a little doubt that holes are there to be exploited – and it’s probably only a matter of time before they are.