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
Published 2020-01-30 22:15:10
Updated 2020-02-05 18:30:49
Source GitHub, Inc.
View at NVD,   CVE.org
Vulnerability category: BypassGain privilege

Products affected by CVE-2020-5206

Exploit prediction scoring system (EPSS) score for CVE-2020-5206

0.17%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 54 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2020-5206

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
6.4
MEDIUM AV:N/AC:L/Au:N/C:P/I:P/A:N
10.0
4.9
NIST
10.0
CRITICAL CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
3.9
5.8
NIST
8.7
HIGH CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
2.3
5.8
GitHub, Inc.

CWE ids for CVE-2020-5206

  • The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action.
    Assigned by: security-advisories@github.com (Secondary)
  • When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.
    Assigned by: nvd@nist.gov (Primary)

References for CVE-2020-5206

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