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Re:Backdoor in upstream xz/liblzma leading to SSH server com... by YetAnotherNick on Friday March 29, 2024 @03:21PM (#39867944)
I am not completely sure about this exploit, but seems like a binary needed to be modified for the exploit to work[1] which was later picked up by build system.

https://github.com/tukaani-project/xz/commit/6e636819e8f0703...

Re:Backdoor in upstream xz/liblzma leading to SSH server com... by ok123456 on Friday March 29, 2024 @03:49PM (#39868257)
The binary was an xz test file that contained a script that patched the c-code.