Vulnerability Details : CVE-2020-8223
A logic error in Nextcloud Server 19.0.0 caused a privilege escalation allowing malicious users to reshare with higher permissions than they got assigned themselves.
Vulnerability category: Gain privilege
Products affected by CVE-2020-8223
- cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
- cpe:2.3:a:nextcloud:nextcloud_server:19.0.0:-:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2020-8223
0.19%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 57 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2020-8223
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
3.5
|
LOW | AV:N/AC:M/Au:S/C:N/I:P/A:N |
6.8
|
2.9
|
NIST | |
|
6.5
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N |
2.8
|
3.6
|
NIST |
CWE ids for CVE-2020-8223
-
The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor.Assigned by:
- nvd@nist.gov (Primary)
- support@hackerone.com (Secondary)
References for CVE-2020-8223
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/T7FX3O6SJE2S52I2HAA4DSTUIISP5BNA/
[SECURITY] Fedora 33 Update: nextcloud-19.0.3-1.fc33 - package-announce - Fedora Mailing-ListsMailing List;Third Party Advisory
-
https://nextcloud.com/security/advisory/?id=NC-SA-2020-029
advisory – NextcloudVendor Advisory
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KC6HLX5SG4PZO6Y54D2LFJ4ATG76BKOP/
[SECURITY] Fedora 32 Update: nextcloud-18.0.9-1.fc32 - package-announce - Fedora Mailing-ListsMailing List;Third Party Advisory
-
https://hackerone.com/reports/889243
#889243 Re-Sharing allows increase of privilegesExploit;Third Party Advisory
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