On Friday, a lone Microsoft developer rocked the world when he revealed a backdoor had been intentionally planted in XZ Utils, an open source data compression utility available on almost all installations of Linux and other Unix-like operating systems. The person or people behind this project likely spent years on it. They were likely very close to seeing the backdoor update merged into Debian and Red Hat, the two biggest distributions of Linux, when an eagle-eyed software developer spotted something fishy.“This might be the best-executed supply chain attack we’ve seen described in the open, and it’s a nightmare scenario: malicious, competent, authorized upstream in a widely used library,” software and cryptography engineer Filippo Valsorda said of the effort, which came frightfully close to succeeding.Researchers have spent the weekend gathering clues. Here’s what we know so far.What Is XZ Utils?XZ Utils is nearly ubiquitous in Linux. It provides lossless data compression on virtually all Unix-like operating systems, including Linux. XZ Utils provides critical functions for compressing and decompressing data during all kinds of operations. XZ Utils also supports the legacy .lzma format, making this component even more crucial.What Happened?Andres Freund, a developer and engineer working on Microsoft’s PostgreSQL offerings, was recently troubleshooting performance problems a Debian system was experiencing with SSH, the most widely used protocol for remotely logging in to devices over the Internet. Specifically, SSH logins were consuming too many CPU cycles and were generating errors with valgrind, a utility for monitoring computer memory.Through sheer luck and Freund’s careful eye, he eventually discovered the problems were the result of updates that had been made to XZ Utils. On Friday, Freund took to the Open Source Security List to disclose the updates were the result of someone intentionally planting a backdoor in the compression software.What Does the Backdoor Do?Malicious code added to XZ Utils versions 5.6.0 and 5.6.1 modified the way the software functions when performing operations related to .lzma compression or decompression. When these functions involved SSH, they allowed for malicious code to be executed with root privileges. This code allowed someone in possession of a predetermined encryption key to log in to the backdoored system over SSH. From then on, that person would have the same level of control as any authorized administrator.How Did This Backdoor Come to Be?It would appear that this backdoor was years in the making. In 2021, someone with the username JiaT75 made their first known commit to an open source project. In retrospect, the change to the libarchive project is suspicious, because it replaced the safe_fprint funcion with a variant that has long been recognized as less secure. No one noticed at the time.Ars TechnicaThis story originally appeared on Ars Technica, a trusted source for technology news, tech policy analysis, reviews, and more. Ars is owned by WIRED’s parent company, Condé Nast.The following year, JiaT75 submitted a patch over the XZ Utils mailing list, and, almost immediately, a never-before-seen participant named Jigar Kumar joined the discussion and argued that Lasse Collin, the longtime maintainer of XZ Utils, hadn’t been updating the software often or fast enough. Kumar, with the support of Dennis Ens and several other people who had never had a presence on the list, pressured Collin to bring on an additional developer to maintain the project.In January 2023, JiaT75 made their first commit to XZ Utils. In the months following, JiaT75, who used the name Jia Tan, became increasingly involved in XZ Utils affairs. For instance, Tan replaced Collins’ contact information with their own on oss-fuzz, a project that scans open source software for vulnerabilities that can be exploited. Tan also requested that oss-fuzz disable the ifunc function during testing, a change that prevented it from detecting the malicious changes Tan would soon make to XZ Utils.In February of this year, Tan issued commits for versions 5.6.0 and 5.6.1 of XZ Utils. The updates implemented the backdoor. In the following weeks, Tan or others appealed to developers of Ubuntu, Red Hat, and Debian to merge the updates into their OSes. Eventually, one of the two updates made its way into several releases, according to security firm Tenable. There’s more about Tan and the timeline here.Can You Say More About What This Backdoor Does?In a nutshell, it allows someone with the right private key to hijack sshd, the executable file responsible for making SSH connections, and from there to execute malicious commands. The backdoor is implemented through a five-stage loader that uses a series of simple but clever techniques to hide itself. It also provides the means for new payloads to be delivered without major changes being required.Multiple people who have reverse-engineered the updates have much more to say about the backdoor. Developer Sam James provided an overview here.In an online interview, developer and reverse engineer HD Moore confirmed the Sam James suspicion that the backdoor targeted either Debian or Red Hat distributions.“The attack was sneaky in that it only did the final steps of the backdoor if you were building the library on amd64 (intel x86 64-bit) and were building a Debian or a RPM package (instead of using it for a local installation),” he wrote.Paraphrasing observations from researchers who collectively spent the weekend analyzing the malicious updates, he continued:When verifying an SSH public key, if the public key matches a certain fingerprint function, the key contents are decrypted using a pre-shared key before the public key is actually verified. The decrypted contents are then passed directly to system.If the fingerprint doesn’t match or the decrypted contents don’t match a certain format, it falls back to regular key verification and no-one’s the wiser.The backdoor is super sneaky. It uses a little-known feature of the glibc to hook a function. It only triggers when the backdoored xz library gets loaded by a /usr/bin/sshd process on one of the affected distributions. There may be many other backdoors, but the one everyone is talking about uses the function indirection stuff to add the hook. The payload was encoded into fake xz test files and runs as a shellcode effectively, changing the SSH RSA key verification code so that a magic public key (sent during normal authentication) let the attacker gain accessTheir grand scheme was:
- sneakily backdoor the release tarballs, but not the source code
- use sockpuppet accounts to convince the various Linux distributions to pull the latest version and package it
- once those distributions shipped it, they could take over any downstream user/company system/etc
Additional technical analysis is available from the above Bluesky thread from Valsorda, researcher Kevin Beaumont, and Freund’s Friday disclosure.What More Do We Know About Jia Tan?At the moment, extremely little, especially for someone entrusted to steward a piece of software as ubiquitous and as sensitive as XZ Utils. This developer persona has touched dozens of other pieces of open source software in the past few years. At the moment, it’s unknown if there was ever a real-world person behind this username or if Jia Tan is a completely fabricated individual.This story originally appeared on Ars Technica.
Source: wired.com