full-disclosure - Re: Symlink vulnerabilities

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Message-ID: <CAH8yC8=dgvsyvssA0ut0-53iOeZ6rKBNOjkrODoNVaZKgh_wVg@mail.gmail.com>
Date: Thu, 27 Oct 2011 09:51:33 -0400
From: Jeffrey Walton <noloader@...il.com>
To: secn3t@...il.com
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: Symlink vulnerabilities

On Thu, Oct 27, 2011 at 9:43 AM, xD 0x41 <secn3t@...il.com> wrote:
> [SNIP]
>
> This means that right after the "ln" command AND before "/tmp/dd" is
> launched, the user can replace the directory "/tmp/dd" by a shell script
> with the same name ("/tmp/dd").
>
> You try to change and fiddle here, it would need alot better than just
> the current shell scripting, and, even then, i dnt think it would win
> the race conditiobn.
See Bishop and Dilger's paper:
nob.cs.ucdavis.edu/bishop/papers/1996-compsys/racecond.pdf

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