gnu: libupnp: Fix CVE-2016-6255.

* gnu/packages/patches/libupnp-CVE-2016-6255.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/libupnp.scm (libupnp): Use it.

gnu/local.mk

@@ -663,6 +663,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/libtiff-oob-write-in-nextdecode.patch	\
   %D%/packages/patches/libtool-skip-tests2.patch		\
   %D%/packages/patches/libunwind-CVE-2015-3239.patch		\
+  %D%/packages/patches/libupnp-CVE-2016-6255.patch		\
   %D%/packages/patches/libvpx-CVE-2016-2818.patch		\
   %D%/packages/patches/libwmf-CAN-2004-0941.patch		\
   %D%/packages/patches/libwmf-CVE-2006-3376.patch		\

gnu/packages/libupnp.scm

@@ -17,6 +17,7 @@
 ;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
 
 (define-module (gnu packages libupnp)
+  #:use-module (gnu packages)
   #:use-module (guix licenses)
   #:use-module (guix packages)
   #:use-module (guix download)
@@ -31,6 +32,7 @@ (define-public libupnp
       (method url-fetch)
       (uri (string-append "mirror://sourceforge/pupnp/pupnp/libUPnP%20"
                           version "/" name "-" version ".tar.bz2"))
+      (patches (search-patches "libupnp-CVE-2016-6255.patch"))
       (sha256
        (base32
         "0qrsdsb1qm85hc4jy04qph895613d148f0x1mmk6z99y3q43fdgf"))))

gnu/packages/patches/libupnp-CVE-2016-6255.patch

@@ -0,0 +1,50 @@
+Fix CVE-2016-6255:
+
+https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-6255
+http://www.openwall.com/lists/oss-security/2016/07/18/13
+
+Patch adapted from upstream commit:
+
+https://github.com/mrjimenez/pupnp/commit/d64d6a44906b5aa5306bdf1708531d698654dda5
+
+The upstream change is simplified to unconditionally disable the HTTP
+POST feature.
+
+From d64d6a44906b5aa5306bdf1708531d698654dda5 Mon Sep 17 00:00:00 2001
+From: Matthew Garrett <mjg59@srcf.ucam.org>
+Date: Tue, 23 Feb 2016 13:53:20 -0800
+Subject: [PATCH] Don't allow unhandled POSTs to write to the filesystem by
+ default
+
+If there's no registered handler for a POST request, the default behaviour
+is to write it to the filesystem. Several million deployed devices appear
+to have this behaviour, making it possible to (at least) store arbitrary
+data on them. Add a configure option that enables this behaviour, and change
+the default to just drop POSTs that aren't directly handled.
+
+Signed-off-by: Marcelo Roberto Jimenez <mroberto@users.sourceforge.net>
+(cherry picked from commit c91a8a3903367e1163765b73eb4d43be7d7927fa)
+---
+ configure.ac                         | 9 +++++++++
+ upnp/inc/upnpconfig.h.in             | 9 +++++++++
+ upnp/src/genlib/net/http/webserver.c | 4 ++++
+ 3 files changed, 22 insertions(+)
+
+diff --git a/upnp/src/genlib/net/http/webserver.c b/upnp/src/genlib/net/http/webserver.c
+index 26bf0f7..7ae8c1e 100644
+--- a/upnp/src/genlib/net/http/webserver.c
++++ b/upnp/src/genlib/net/http/webserver.c
+@@ -1367,9 +1367,13 @@ static int http_RecvPostMessage(
+ 		if (Fp == NULL)
+ 			return HTTP_INTERNAL_SERVER_ERROR;
+ 	} else {
++#if 0
+ 		Fp = fopen(filename, "wb");
+ 		if (Fp == NULL)
+ 			return HTTP_UNAUTHORIZED;
++#else
++		return HTTP_NOT_FOUND;
++#endif
+ 	}
+ 	parser->position = POS_ENTITY;
+ 	do {