openocd: patch security issue

CVE-2018-5704 - https://nvd.nist.gov/vuln/detail/CVE-2018-5704

Signed-off-by: Jan Pavlinec <jan.pavlinec@nic.cz>

utils/openocd/patches/101-cve-2018-5704-css-fix.patch

@@ -0,0 +1,47 @@
+Subject: Prevent some forms of Cross Protocol Scripting attacks
+Author: Andreas Fritiofson <andreas.fritiofson@gmail.com>
+Origin: other, http://openocd.zylin.com/#/c/4335/
+Bug-Debian: https://bugs.debian.org/887488
+Last-Update: 2018-01-18
+
+From 3a223ca3ebc7ac24d7726a0cd58e5695bc813657 Mon Sep 17 00:00:00 2001
+From: Andreas Fritiofson <andreas.fritiofson@gmail.com>
+Date: Sat, 13 Jan 2018 21:00:47 +0100
+Subject: [PATCH] CVE-2018-5704: Prevent some forms of Cross Protocol Scripting attacks
+
+OpenOCD can be targeted by a Cross Protocol Scripting attack from
+a web browser running malicious code, such as the following PoC:
+
+var x = new XMLHttpRequest();
+x.open("POST", "http://127.0.0.1:4444", true);
+x.send("exec xcalc\r\n");
+
+This mitigation should provide some protection from browser-based
+attacks and is based on the corresponding fix in Redis:
+
+https://github.com/antirez/redis/blob/8075572207b5aebb1385c4f233f5302544439325/src/networking.c#L1758
+
+Change-Id: Ia96ebe19b74b5805dc228bf7364c7971a90a4581
+Signed-off-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>
+Reported-by: Josef Gajdusek <atx@atx.name>
+---
+
+diff --git a/src/server/startup.tcl b/src/server/startup.tcl
+index 64ace40..dd1b31e 100644
+--- a/src/server/startup.tcl
++++ b/src/server/startup.tcl
+@@ -8,3 +8,14 @@
+ 	# one target
+ 	reset halt
+ }
++
++proc prevent_cps {} {
++	echo "Possible SECURITY ATTACK detected."
++	echo "It looks like somebody is sending POST or Host: commands to OpenOCD."
++	echo "This is likely due to an attacker attempting to use Cross Protocol Scripting"
++	echo "to compromise your OpenOCD instance. Connection aborted."
++	exit
++}
++
++proc POST {args} { prevent_cps }
++proc Host: {args} { prevent_cps }