texlive CVE-2016-10243

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  • Leo Famulari
  • Ricardo Wurmus
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Leo Famulari
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Leo Famulari wrote on 5 Mar 2017 19:30
(address . guix-patches@gnu.org)
20170306033058.GA19658@jasmine
This fixes CVE-2016-10243:

"The TeX system allows for calling external programs from within the
TeX source code (called \write18). This has been restricted to a
small set of programs since a long time ago.

Unfortunately it turned out that one program in the list, mpost
(also shipped with TeX Live), allows in turn to specify other
programs to be run, which allows arbitrary code execution when
compiling a TeX document."

source:

This patch prevents the POC described in blog post:

From 09cb7073e44b04b778b5b26a75074aaf2c8ee8e4 Mon Sep 17 00:00:00 2001
From: Leo Famulari <leo@famulari.name>
Date: Sun, 5 Mar 2017 20:41:36 -0500
Subject: [PATCH] gnu: texlive: Fix CVE-2016-10243.

* gnu/packages/patches/texlive-texmf-CVE-2016-10243.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/tex.scm (texlive-texmf-src): Use it.
---
gnu/local.mk | 1 +
.../patches/texlive-texmf-CVE-2016-10243.patch | 18 ++++++++++++++++++
gnu/packages/tex.scm | 2 ++
3 files changed, 21 insertions(+)
create mode 100644 gnu/packages/patches/texlive-texmf-CVE-2016-10243.patch

Toggle diff (51 lines)
diff --git a/gnu/local.mk b/gnu/local.mk
index c88892df5..9f83c2bca 100644
--- a/gnu/local.mk
+++ b/gnu/local.mk
@@ -930,6 +930,7 @@ dist_patch_DATA = \
%D%/packages/patches/tcsh-fix-autotest.patch \
%D%/packages/patches/tcsh-fix-out-of-bounds-read.patch \
%D%/packages/patches/teensy-loader-cli-help.patch \
+ %D%/packages/patches/texlive-texmf-CVE-2016-10243.patch \
%D%/packages/patches/texi2html-document-encoding.patch \
%D%/packages/patches/texi2html-i18n.patch \
%D%/packages/patches/tidy-CVE-2015-5522+5523.patch \
diff --git a/gnu/packages/patches/texlive-texmf-CVE-2016-10243.patch b/gnu/packages/patches/texlive-texmf-CVE-2016-10243.patch
new file mode 100644
index 000000000..3a9ae993f
--- /dev/null
+++ b/gnu/packages/patches/texlive-texmf-CVE-2016-10243.patch
@@ -0,0 +1,18 @@
+Fix CVE-2016-10243:
+
+https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-10243
+
+Patch adapted from upstream commit:
+
+https://www.tug.org/svn/texlive?view=revision&revision=42605
+
+--- trunk/Master/texmf-dist/web2c/texmf.cnf 2016/11/29 23:10:33 42604
++++ trunk/Master/texmf-dist/web2c/texmf.cnf 2016/11/29 23:27:53 42605
+@@ -568,7 +568,6 @@ extractbb,\
+ gregorio,\
+ kpsewhich,\
+ makeindex,\
+-mpost,\
+ repstopdf,\
+
+ % we'd like to allow:
diff --git a/gnu/packages/tex.scm b/gnu/packages/tex.scm
index 7c84ed719..404fd0339 100644
--- a/gnu/packages/tex.scm
+++ b/gnu/packages/tex.scm
@@ -72,6 +72,8 @@
(origin
(method url-fetch)
(uri "ftp://tug.org/historic/systems/texlive/2016/texlive-20160523b-texmf.tar.xz")
+ (patches (search-patches "texlive-texmf-CVE-2016-10243.patch"))
+ (patch-flags '("-p2"))
(sha256 (base32
"1dv8vgfzpczqw82hv9g7a8djhhyzywljmrarlcyy6g2qi5q51glr"))))
--
2.12.0
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Ricardo Wurmus wrote on 6 Mar 2017 01:02
(name . Leo Famulari)(address . leo@famulari.name)(address . 25993@debbugs.gnu.org)
87bmte4w35.fsf@elephly.net
Leo Famulari <leo@famulari.name> writes:

Toggle quote (2 lines)
> This fixes CVE-2016-10243:

Thanks for preparing the patch to fix this.

Toggle quote (26 lines)
> diff --git a/gnu/packages/patches/texlive-texmf-CVE-2016-10243.patch b/gnu/packages/patches/texlive-texmf-CVE-2016-10243.patch
> new file mode 100644
> index 000000000..3a9ae993f
> --- /dev/null
> +++ b/gnu/packages/patches/texlive-texmf-CVE-2016-10243.patch
> @@ -0,0 +1,18 @@
> +Fix CVE-2016-10243:
> +
> +https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-10243
> +
> +Patch adapted from upstream commit:
> +
> +https://www.tug.org/svn/texlive?view=revision&revision=42605
> +
> +--- trunk/Master/texmf-dist/web2c/texmf.cnf 2016/11/29 23:10:33 42604
> ++++ trunk/Master/texmf-dist/web2c/texmf.cnf 2016/11/29 23:27:53 42605
> +@@ -568,7 +568,6 @@ extractbb,\
> + gregorio,\
> + kpsewhich,\
> + makeindex,\
> +-mpost,\
> + repstopdf,\
> +
> + % we'd like to allow:
> diff --git a/gnu/packages/tex.scm b/gnu/packages/tex.scm

Is this sufficient? I see here that two files need this change:


Should “trunk/Build/source/texk/kpathsea/texmf.cnf” also be patched?

--
Ricardo

GPG: BCA6 89B6 3655 3801 C3C6 2150 197A 5888 235F ACAC
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Leo Famulari wrote on 6 Mar 2017 10:30
(name . Ricardo Wurmus)(address . rekado@elephly.net)(address . 25993@debbugs.gnu.org)
20170306183000.GA2185@jasmine
On Mon, Mar 06, 2017 at 10:02:06AM +0100, Ricardo Wurmus wrote:
Toggle quote (6 lines)
> Is this sufficient? I see here that two files need this change:
>
> https://www.tug.org/svn/texlive?view=revision&revision=42605
>
> Should “trunk/Build/source/texk/kpathsea/texmf.cnf” also be patched?

I inspected the built output of texlive, texlive-bin, and texlive-texmf,
and none of them include the texmf.cnf file for kpathsea.

That file does exist in the source.

AFAICT, the only .cnf file in our built package that whitelists mpost is
the one I patched.
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Ricardo Wurmus wrote on 6 Mar 2017 13:32
(name . Leo Famulari)(address . leo@famulari.name)(address . 25993@debbugs.gnu.org)
87zigy2isr.fsf@elephly.net
Leo Famulari <leo@famulari.name> writes:

Toggle quote (15 lines)
> On Mon, Mar 06, 2017 at 10:02:06AM +0100, Ricardo Wurmus wrote:
>> Is this sufficient? I see here that two files need this change:
>>
>> https://www.tug.org/svn/texlive?view=revision&revision=42605
>>
>> Should “trunk/Build/source/texk/kpathsea/texmf.cnf” also be patched?
>
> I inspected the built output of texlive, texlive-bin, and texlive-texmf,
> and none of them include the texmf.cnf file for kpathsea.
>
> That file does exist in the source.
>
> AFAICT, the only .cnf file in our built package that whitelists mpost is
> the one I patched.

Thank you for confirming this. The patch looks good to me!

--
Ricardo

GPG: BCA6 89B6 3655 3801 C3C6 2150 197A 5888 235F ACAC
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Leo Famulari wrote on 6 Mar 2017 13:49
(name . Ricardo Wurmus)(address . rekado@elephly.net)(address . 25993@debbugs.gnu.org)
20170306214927.GA3639@jasmine
On Mon, Mar 06, 2017 at 10:32:04PM +0100, Ricardo Wurmus wrote:
Toggle quote (20 lines)
>
> Leo Famulari <leo@famulari.name> writes:
>
> > On Mon, Mar 06, 2017 at 10:02:06AM +0100, Ricardo Wurmus wrote:
> >> Is this sufficient? I see here that two files need this change:
> >>
> >> https://www.tug.org/svn/texlive?view=revision&revision=42605
> >>
> >> Should “trunk/Build/source/texk/kpathsea/texmf.cnf” also be patched?
> >
> > I inspected the built output of texlive, texlive-bin, and texlive-texmf,
> > and none of them include the texmf.cnf file for kpathsea.
> >
> > That file does exist in the source.
> >
> > AFAICT, the only .cnf file in our built package that whitelists mpost is
> > the one I patched.
>
> Thank you for confirming this. The patch looks good to me!

Thanks for your review!

Pushed as e20784e65efa7c783792e8a830d4b4aaf35750d5

By the way, I'd normally adjust the patch to use the default patch-level
of 'p1', and to include another, more descriptive, link about the bug.
But I lack the disk space to rebuild texlive again. Building it before
and after the bug-fix, for testing, used ~12 GB.
R
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Ricardo Wurmus wrote on 9 Mar 2017 00:06
control message for bug #25993
(address . control@debbugs.gnu.org)
E1clt5v-0003UJ-PT@debbugs.gnu.org
tags 25993 fixed
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Ricardo Wurmus wrote on 9 Mar 2017 00:14
Re: bug#25993: texlive CVE-2016-10243
(address . 25993-done@debbugs.gnu.org)
871su63lzr.fsf@elephly.net
Toggle quote (2 lines)
> Pushed as e20784e65efa7c783792e8a830d4b4aaf35750d5

Closing.
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