Date: Mon, 09 May 2016 14:03:25 -0500 From: John Lightsey <john@...nuts.net> To: oss-security@...ts.openwall.com Subject: Re: GraphicsMagick Response To "ImageTragick" On Mon, 2016-05-09 at 18:20 +0100, Simon McVittie wrote: > On Mon, 09 May 2016 at 08:29:40 -0500, Bob Friesenhahn wrote: > > 1. CVE-2016-3714 - Insufficient shell characters filtering > > > > GraphicsMagick is not susceptible to remote code execution except > > if gnuplot is installed (because gnuplot executes shell commands). > > Gnuplot-shell based shell exploits are possible without a gnuplot > > file being involved although gnuplot invokes the shell. To fix > > this, the "gplt" entry in the delegates.mgk file must be removed. > > I think this should perhaps have a separate CVE ID assigned: it's the > same impact (arbitrary code execution) and was discovered at around > the same time, but the mechanism is not similar to the > missing/insufficient quoting/escaping for ImageMagick's %M placeholder, > which was the root cause of (the original incarnation of) CVE-2016-3714. > > In GraphicsMagick this was the "GPLT" format, removed in hg commit > "Gnuplot files are inherently insecure. Remove delegates support for > reading them." > https://sourceforge.net/p/graphicsmagick/code/ci/45998a25992d1142df201d8cf024b > 6c948b40748/ > > In ImageMagick this was the "PLT" format, removed in this git commit with > the misleading commit message "Update to the latest autoconf/automake": > https://github.com/ImageMagick/ImageMagick/commit/e87116ab2bd070c47943d4118a18 > c8f3a47461e2 > > MITRE, do you consider this to be: > > * part of CVE-2016-3714, > * a single separate vulnerability to which both GraphicsMagick and ImageMagick > were vulnerable, or > * two separate vulnerabilities, one in each package? > The "man" attack vector needs the same determination. It is similar to CVE-2016-3717 in impact, but uses a different codepath. The existing fixes for CVE-2016-3717 do not address it. Download attachment "signature.asc" of type "application/pgp-signature" (820 bytes)
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