{"id":"GHSA-vmm6-w4cf-7f3x","summary":"Authentication Bypass For Endpoints With Anonymous Access in Opencast","details":"### Impact\n\nUsing 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.\n\nThis 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.\n\n\n### Patches\n\nThis problem is fixed in Opencast 7.6 and Opencast 8.1\n\n\n### Workarounds\n\nAs a workaround for older, unpatched versions, disabling remember-me cookies in `etc/security/mh_default_org.xml` will mitigate the problem but will obviously also disable this feature without obvious indication. To deactivate this, remove the following line from the security configuration:\n\n```xml\n\u003csec:remember-me … /\u003e\n```\n\n### References\n\n- [Remember-me cookie in the security configuration file](https://github.com/opencast/opencast/blob/161ee619382f144dc35eea211fc6b556025b98e1/etc/security/mh_default_org.xml#L335-L336)\n\n\n### For more information\n\nIf you have any questions or comments about this advisory:\n\n- Open an issue in [opencast/opencast](https://github.com/opencast/opencast/issues)\n- For security-relevant information, email us at security@opencast.org","aliases":["CVE-2020-5206"],"modified":"2026-09-10T03:48:42.567224822Z","published":"2020-01-30T21:21:30Z","database_specific":{"cwe_ids":["CWE-285"],"severity":"CRITICAL","github_reviewed":true,"github_reviewed_at":"2020-01-30T21:13:52Z","nvd_published_at":null},"references":[{"type":"WEB","url":"https://github.com/opencast/opencast/security/advisories/GHSA-vmm6-w4cf-7f3x"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2020-5206"},{"type":"WEB","url":"https://github.com/opencast/opencast/commit/b157e1fb3b35991ca7bf59f0730329fbe7ce82e8"}],"affected":[{"package":{"name":"org.opencastproject:opencast-kernel","ecosystem":"Maven","purl":"pkg:maven/org.opencastproject/opencast-kernel"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7.6"}]}],"versions":["6.6","7.2","7.3","7.4","7.5"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2020/01/GHSA-vmm6-w4cf-7f3x/GHSA-vmm6-w4cf-7f3x.json"}},{"package":{"name":"org.opencastproject:opencast-kernel","ecosystem":"Maven","purl":"pkg:maven/org.opencastproject/opencast-kernel"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"8.0"},{"fixed":"8.1"}]}],"versions":["8.0"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2020/01/GHSA-vmm6-w4cf-7f3x/GHSA-vmm6-w4cf-7f3x.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N"}]}