Exploit the possiblities

pChart 2.1.3 Cross Site Scripting / Directory Traversal

pChart 2.1.3 Cross Site Scripting / Directory Traversal
Posted Jan 24, 2014
Authored by Balazs Makany

pChart version 2.1.3 suffers from cross site scripting and directory traversal vulnerabilities.

tags | exploit, vulnerability, xss, file inclusion
MD5 | 3bb6340af6fc94bf416810517e6e450b

pChart 2.1.3 Cross Site Scripting / Directory Traversal

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# Exploit Title: pChart 2.1.3 Directory Traversal and Reflected XSS
# Date: 2014-01-24
# Exploit Author: Balazs Makany
# Vendor Homepage: www.pchart.net
# Software Link: www.pchart.net/download
# Google Dork: intitle:"pChart 2.x - examples" intext:"2.1.3"
# Version: 2.1.3
# Tested on: N/A (Web Application. Tested on FreeBSD and Apache)
# CVE : N/A

[0] Summary:
PHP library pChart 2.1.3 (and possibly previous versions) by default
contains an examples folder, where the application is vulnerable to
Directory Traversal and Cross-Site Scripting (XSS).
It is plausible that custom built production code contains similar
problems if the usage of the library was copied from the examples.
The exploit author engaged the vendor before publicly disclosing the
vulnerability and consequently the vendor released an official fix
before the vulnerability was published.


[1] Directory Traversal:
"hxxp://localhost/examples/index.php?Action=View&Script=%2f..%2f..%2fetc/passwd"
The traversal is executed with the web server's privilege and leads to
sensitive file disclosure (passwd, siteconf.inc.php or similar),
access to source codes, hardcoded passwords or other high impact
consequences, depending on the web server's configuration.
This problem may exists in the production code if the example code was
copied into the production environment.

Directory Traversal remediation:
1) Update to the latest version of the software.
2) Remove public access to the examples folder where applicable.
3) Use a Web Application Firewall or similar technology to filter
malicious input attempts.


[2] Cross-Site Scripting (XSS):
"hxxp://localhost/examples/sandbox/script/session.php?<script>alert('XSS')</script>
This file uses multiple variables throughout the session, and most of
them are vulnerable to XSS attacks. Certain parameters are persistent
throughout the session and therefore persists until the user session
is active. The parameters are unfiltered.

Cross-Site Scripting remediation:
1) Update to the latest version of the software.
2) Remove public access to the examples folder where applicable.
3) Use a Web Application Firewall or similar technology to filter
malicious input attempts.


[3] Disclosure timeline:
2014 January 16 - Vulnerability confirmed, vendor contacted
2014 January 17 - Vendor replied, responsible disclosure was orchestrated
2014 January 24 - Vendor was inquired about progress, vendor replied
and noted that the official patch is released.



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