Date: Wed, 28 Sep 2016 16:03:08 -0700 From: Tavis Ormandy <taviso@...gle.com> To: Bob Friesenhahn <bfriesen@...ple.dallas.tx.us> Cc: oss-security@...ts.openwall.com Subject: Re: ImageMagick identify "d:" hangs On Wed, Sep 28, 2016 at 3:15 PM, Bob Friesenhahn <bfriesen@...ple.dallas.tx.us> wrote: > On Wed, 28 Sep 2016, Tavis Ormandy wrote: >> >> >> (/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. > > > It is good that you did not single out just one using program. > > This issue seems to afflict any program which invokes Ghostscript in general > and not just *Magick. However, 'convert' does offer to write a rendered > result to an output file. > I think I see the problem, ghostscript broke -dSAFER then they fixed it later but didn't allocate a CVE, so the distros never updated. http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=ae930279498a5961fcf5d70ffe86864883609cbc I think it should be fixed in gs 9.10 or later (Debian appears to be on 9.06), but you can still enumerate filenames (just not the content). Tavis
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