CVE-2020-5206 Authentication Bypass For Endpoints With Anonymous Access in OpenCast

2020-01-3021:25:16

CWE-285

GitHub_M

www.cve.org

8.7 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

NONE

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

9.4 High

AI Score

Confidence

High

0.002 Low

EPSS

Percentile

54.7%

JSON

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

CNA Affected

[
  {
    "product": "opencast",
    "vendor": "opencast",
    "versions": [
      {
        "status": "affected",
        "version": "< 7.6"
      },
      {
        "status": "affected",
        "version": ">= 8.0, < 8.1"
      }
    ]
  }
]