The thwarted XZ Utils supply chain attack was years in the making. Now, clues suggest nation-state hackers were behind the persona that inserted the malicious code.
Over the weekend, the cybersecurity and open source software community was shocked by the news that a relatively new, experimental version of XZ Utils—a compression utility integrated into many popular distributions of Linux—contained a backdoor that would have allowed hackers in possession of a specific private key to connect to the backdoored system and run their own commands as an administrator.
Because those changes, known as “commits,” are often batched into collections in a process known as “squashing commits,” it’s not always apparent which exact changes were made by Jia Tan. And the difficulty of tracing which of the many versions of a library like libarchive ended up in which software adds yet another layer of obfuscation. “It’s going to be a bit of a mess pulling on this thread and trying to figure out where all these things ended up,” Scott says.
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