Revive Adserver 5.1.0 Cross Site Scripting

`========================================================================  
Revive Adserver Security Advisory REVIVE-SA-2021-002  
------------------------------------------------------------------------  
https://www.revive-adserver.com/security/revive-sa-2021-002  
------------------------------------------------------------------------  
CVE-IDs: CVE-2021-22874, CVE-2021-22875  
Date: 2020-01-26  
Risk Level: Low  
Applications affected: Revive Adserver  
Versions affected: <= 5.1.0  
Versions not affected: >= 5.1.1  
Website: https://www.revive-adserver.com/  
========================================================================  
  
  
========================================================================  
Vulnerability 1 - Reflected XSS  
========================================================================  
Vulnerability Type: Improper Neutralization of Input During Web Page  
Generation ('Cross-site Scripting') [CWE-79]  
CVE-ID: CVE-2021-22874  
CVSS Base Score: 4.3  
CVSSv3.1 Vector: AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N  
CVSS Impact Subscore: 1.4  
CVSS Exploitability Subscore: 2.8  
========================================================================  
  
Description  
-----------  
Security researcher Alexey Solovyev (solov9ev) has discovered a  
reflected XSS vulnerability in userlog-index.php. An attacker could  
trick a user with access to the user interface of a Revive Adserver  
instance into clicking on a specifically crafted URL and execute  
injected JavaScript code.  
  
  
Details  
-------  
The period_preset parameter was not fully escaped in userlog-index.php  
(and possibly other scripts) when printed it in a JavaScript context,  
allowing an attacker to work around the existing escaping with the  
injection of a closing </script> tag. That allows to append other  
malicious HTML and/or JavaScript code. What could be injected is limited  
by the existing escaping and the session cookie cannot be accessed or  
stolen via JavaScript.  
  
References  
----------  
https://hackerone.com/reports/1083231  
https://github.com/revive-adserver/revive-adserver/commit/e2a67ce8  
https://cwe.mitre.org/data/definitions/79.html  
  
  
  
========================================================================  
Vulnerability 2 - Reflected XSS  
========================================================================  
Vulnerability Type: Improper Neutralization of Input During Web Page  
Generation ('Cross-site Scripting') [CWE-79]  
CVE-ID: CVE-2021-22875  
CVSS Base Score: 4.3  
CVSSv3.1 Vector: AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N  
CVSS Impact Subscore: 1.4  
CVSS Exploitability Subscore: 2.8  
========================================================================  
  
Description  
-----------  
Security researcher Alexey Solovyev (solov9ev) has discovered a  
reflected XSS vulnerability in stats.php. An attacker could trick a user  
with access to the user interface of a Revive Adserver instance into  
clicking on a specifically crafted URL and pressing a certain key  
combination to execute injected JavaScript code.  
  
  
Details  
-------  
The setPerPage parameter was not fully escaped in stats.php (and  
possibly other scripts) when printed it in an HTML attribute, allowing  
an attacker to work around the existing escaping and to inject other  
HTML attributes. The published exploit requires the victim to press a  
complex combination of keys to execute JavaScript code injected as  
onclick attribute of a hidden form field. Again, the session cookie  
cannot be accessed or stolen via JavaScript.  
  
  
  
References  
----------  
https://hackerone.com/reports/1083376  
https://github.com/revive-adserver/revive-adserver/commit/6f46076a  
https://cwe.mitre.org/data/definitions/79.html  
  
  
========================================================================  
Solution  
========================================================================  
  
We strongly advise people to upgrade to the most recent 5.1.1 version of  
Revive Adserver.  
  
  
========================================================================  
Contact Information  
========================================================================  
  
The security contact for Revive Adserver can be reached at:  
<security AT revive-adserver DOT com>.  
  
Please review https://www.revive-adserver.com/security/ before doing so.  
  
  
--   
Matteo Beccati  
On behalf of the Revive Adserver Team  
https://www.revive-adserver.com/  
  
  
  
  
  
  
  
  
  
`