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Date: Fri, 23 Oct 2015 14:24:41 +0200
From: Yves-Alexis Perez <>
Subject: Re: CVE Request: BusyBox tar directory traversal

On ven., 2015-10-23 at 03:01 -0400, Robert Watson wrote:
> Remember that tar was created primarily for software distribution

Actually no, it was created to write archives to (magnetic) tapes.

>  and
> compressed tar files are most often used to this day for that purpose.
> Software distribution almost always involves writing files to many
> different directories at all levels of the filesystem. Symlinks between
> them are quite common as well.

Sure, you just don't want them to escape from CWD. There has been example of
this to bypass “safe updates” procedures for example.


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