The definition breaks down
A mere three months later, a brand new kind of assault materialized that didn’t match throughout the current typology. A brand new assault kind referred to as “dependency confusion” was coined when safety researcher Alex Birsan self-published a Medium article sub-titled “How I Hacked into Apple, Microsoft, and Dozens of Different Corporations.” What was intelligent about this new assault kind is the way it took benefit of the non-intuitive habits of bundle managers, permitting an attacker to trick builders into downloading malicious code from an exterior bundle registry slightly than, as deliberate, an inner bundle registry. Whereas much like typosquatting, which was already a minor class in our typology, this assault didn’t really contain a typo. Our authentic definition of software program provide chain safety had already been stretched. We added one other minor class and moved on.
Then in December 2021, Log4shell occurred and the “web was on hearth.” Now our typology suffered a mortal wound. The sooner typology targeted completely on the insertion of malicious code, however the Log4shell vulnerability didn’t contain malicious code. Nonetheless, Log4shell clearly represented a widespread vulnerability within the software program provide chain. It was an simply exploited and extreme vulnerability, launched by a flaw in a extensively in style open supply Java logging library. The episode revealed an important flaw in our current definition of software program provide chain safety: unintentional safety flaws in extensively used open supply software program had no place. That authentic typology, for the needs of my profession, was useless solely 18 months after invention.
Accepting a broader definition
Upon reflection, the “provide chain” side of software program provide chain safety suggests the essential ingredient of an improved definition. Software program producers, like producers, have a provide chain. And software program producers, like producers, require inputs after which carry out a producing course of to construct a completed product. In different phrases, a software program producer makes use of parts, developed by third events and themselves, and applied sciences to write down, construct, and distribute software program. A vulnerability or compromise of this chain, whether or not accomplished by way of malicious code or by way of the exploitation of an unintentional vulnerability, is what defines software program provide chain safety. I ought to point out {that a} related, rival knowledge set maintained by the Atlantic Council makes use of this broader definition. (Full disclosure: I’m now a non-resident fellow on the Atlantic Council. In case you can’t beat ‘em, be a part of ‘em.)
