From 3a223ca3ebc7ac24d7726a0cd58e5695bc813657 Mon Sep 17 00:00:00 2001
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From: Andreas Fritiofson <andreas.fritiofson@gmail.com>
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Date: Sat, 13 Jan 2018 21:00:47 +0100
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Subject: [PATCH] CVE-2018-5704: Prevent some forms of Cross Protocol Scripting
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attacks
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OpenOCD can be targeted by a Cross Protocol Scripting attack from
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a web browser running malicious code, such as the following PoC:
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var x = new XMLHttpRequest();
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x.open("POST", "http://127.0.0.1:4444", true);
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x.send("exec xcalc\r\n");
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This mitigation should provide some protection from browser-based
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attacks and is based on the corresponding fix in Redis:
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https://github.com/antirez/redis/blob/8075572207b5aebb1385c4f233f5302544439325/src/networking.c#L1758
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Upstream-status: Under review: http://openocd.zylin.com/#/c/4335/
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Change-Id: Ia96ebe19b74b5805dc228bf7364c7971a90a4581
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Signed-off-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>
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Reported-by: Josef Gajdusek <atx@atx.name>
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Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
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---
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src/server/startup.tcl | 11 +++++++++++
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1 file changed, 11 insertions(+)
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diff --git a/src/server/startup.tcl b/src/server/startup.tcl
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index 64ace407..dd1b31e4 100644
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--- a/src/server/startup.tcl
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+++ b/src/server/startup.tcl
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@@ -8,3 +8,14 @@ proc ocd_gdb_restart {target_id} {
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# one target
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reset halt
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}
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+
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+proc prevent_cps {} {
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+ echo "Possible SECURITY ATTACK detected."
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+ echo "It looks like somebody is sending POST or Host: commands to OpenOCD."
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+ echo "This is likely due to an attacker attempting to use Cross Protocol Scripting"
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+ echo "to compromise your OpenOCD instance. Connection aborted."
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+ exit
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+}
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+
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+proc POST {args} { prevent_cps }
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+proc Host: {args} { prevent_cps }
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--
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2.11.0
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