PILOS (Platform for Interactive Live-Online Seminars) is a frontend for BigBlueButton. From 2.1.0 until 4.14.1, PILOS does not send a Cross-Origin-Opener-Policy response header, so pages opened by PILOS via a link that opens a new browsing context (e.g., target="_blank") retain a window.opener reference back to the originating PILOS tab. A malicious destination page reached this way can use window.opener to navigate or manipulate the original PILOS tab, a technique known as reverse tabnabbing, potentially redirecting an authenticated user to a phishing page that mimics PILOS.
This issue is fixed in version 4.14.1.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
Required
User action required
Impact Assessment
Confidentiality
None
No data leak
Integrity
Low
Partial data modification
Availability
None
No disruption
CVSS Vector v3.1
Weakness Type (CWE)
Vulnerable Products
thm-health:pilos
References 3
https://github.com/THM-Health/PILOS/commit/b50f2bd07c4f4a7d6a9981578238ae357927…
security-advisories@github.com
https://github.com/THM-Health/PILOS/releases/tag/v4.14.1
security-advisories@github.com
https://github.com/THM-Health/PILOS/security/advisories/GHSA-j4wr-p8gh-xrw5
security-advisories@github.com