// For flags

CVE-2020-5206

Authentication Bypass For Endpoints With Anonymous Access in OpenCast

Severity Score

10.0
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

In Opencast before 7.6 and 8.1, using a remember-me cookie with an arbitrary username can cause Opencast to assume proper authentication for that user even if the remember-me cookie was incorrect given that the attacked endpoint also allows anonymous access. This way, an attacker can, for example, fake a remember-me token, assume the identity of the global system administrator and request non-public content from the search service without ever providing any proper authentication. This problem is fixed in Opencast 7.6 and Opencast 8.1

En Opencast versiones anteriores a 7.6 y 8.1, usando una cookie remember-me con un nombre de usuario arbitrario puede causar que Opencast asuma una autenticación apropiada para ese usuario, inclusive si la cookie remember-me era incorrecta, dado que el endpoint atacado también permite el acceso anónimo. De esta forma, un atacante puede, por ejemplo, falsificar un token de remember-me, asumir la identidad del administrador del sistema global y solicitar contenido no público desde el servicio de búsqueda sin proporcionar una autenticación adecuada. Este problema se corrigió en Opencast versión 7.6 y Opencast versión 8.1.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
None
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
None
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
None
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2020-01-02 CVE Reserved
  • 2020-01-30 CVE Published
  • 2023-03-07 EPSS Updated
  • 2024-08-04 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-285: Improper Authorization
  • CWE-287: Improper Authentication
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Apereo
Search vendor "Apereo"
 Opencast
Search vendor "Apereo" for product "Opencast"
 < 7.6
Search vendor "Apereo" for product "Opencast" and version " < 7.6"
-
Affected
Apereo
Search vendor "Apereo"
 Opencast
Search vendor "Apereo" for product "Opencast"
 8.0
Search vendor "Apereo" for product "Opencast" and version "8.0"
-
Affected