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Re: [Bug-cpio] [PATCH] symlink target sanity check to prevent --no-absol

From: Pavel Raiskup
Subject: Re: [Bug-cpio] [PATCH] symlink target sanity check to prevent --no-absolute-filenames bypass
Date: Wed, 07 Jun 2017 10:46:07 +0200

On Wednesday, June 7, 2017 10:07:21 AM CEST Cedric Buissart wrote:
> > In other words and IMO, if we were about to fix this issue - we should only
> > refuse to extract files through symlinks.
> Through any symlinks, or only those created by the archive itself ?

Remembering the extracted links might be expensive, and with
--no-absolute-filenames we want to stay in CWD anyway - no matter how the links
in CWD were created.

> The latter might look less restrictive, but what happens if a local
> attacker is able to create a symlink. Is it something that should be
> considered ?

Usually user should avoid races manually when running archiver:


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