HumHub 1.0.1 Cross Site Scripting

`Security Advisory - Curesec Research Team  
  
1. Introduction  
  
Affected Product: HumHub 1.0.1 and earlier  
Fixed in: 1.1.1  
Fixed Version https://www.humhub.org/en/download/default/form?version=1.1.1  
Link: &type=zip  
Vendor Website: https://www.humhub.org/  
Vulnerability XSS  
Type:  
Remote Yes  
Exploitable:  
Reported to 01/10/2016  
vendor:  
Disclosed to 03/17/2017  
public:  
Release mode: Coordinated Release  
CVE: n/a  
Credits Tim Coen of Curesec GmbH  
  
2. Overview  
  
HumHub is a social media platform written in PHP. In version 1.0.1 and earlier,  
it is vulnerable to a reflected XSS attack if debugging is enabled, as well as  
a self-XSS attack. This allows an attacker to steal cookies, inject JavaScript  
keyloggers, or bypass CSRF protection.  
  
3. Details  
  
XSS 1: Reflected XSS  
  
CVSS: Medium 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N  
  
Description: When the debug mode is enabled, which it is by default, the  
UserSearch parameter is vulnerable to reflected XSS. Additionally, the  
resulting error page discloses all cookies - even httpOnly cookies -, and the  
contents of the $_SERVER array.  
  
Proof of Concept:  
  
http://localhost/humhub-0.20.0/index.php?UserSearch[last_login]=<script>alert  
(1)</script>&r=admin%2Fuser  
  
XSS 2: DOM-based Self-XSS  
  
CVSS: Low 2.6 AV:N/AC:H/Au:N/C:N/I:P/A:N  
  
There is a reflected DOM-based self-XSS vulnerability in HumHub. It may be  
possible to exploit this issue via ClickJacking in some browsers.  
  
Proof of Concept:  
  
Visit the profile of a user: http://localhost/humhub-0.20.0/index.php?r=  
space%2Fspace&sguid=d2f06d0a-47e1-4549-b469-c8a1df48faca In the "What's on your  
mind?"-text box enter: '"><img src=no onerror=alert(5)>  
  
4. Solution  
  
To mitigate this issue please upgrade at least to version 1.1.1:  
  
https://www.humhub.org/en/download/default/form?version=1.1.1&type=zip  
  
Please note that a newer version might already be available.  
  
5. Report Timeline  
  
01/10/2016 Informed Vendor about Issue  
01/12/2016 Vendor confirms issue  
02/10/2016 Vendor requests more time  
08/16/2016 Vendor releases partial fix  
09/26/2016 Vendor releases fix  
03/27/2017 Disclosed to public  
  
  
Blog Reference:  
https://www.curesec.com/blog/article/blog/HumHub-101-XSS-195.html  
  
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Curesec GmbH  
Curesec Research Team  
Josef-Orlopp-StraAe 54  
10365 Berlin, Germany  
  
  
`