Vulnerability Details : CVE-2021-32703

Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.13, 20.011, and 21.0.3, there was a lack of ratelimiting on the shareinfo endpoint. This may have allowed an attacker to enumerate potentially valid share tokens. The issue was fixed in versions 19.0.13, 20.0.11, and 21.0.3. There are no known workarounds.

Published 2021-07-12 16:15:09

Updated 2022-10-26 14:10:23

Source GitHub, Inc.

View at NVD, CVE.org

Exploit prediction scoring system (EPSS) score for CVE-2021-32703

Probability of exploitation activity in the next 30 days: 0.11%

Percentile, the proportion of vulnerabilities that are scored at or less: ~ 43 % EPSS Score History EPSS FAQ

CVSS scores for CVE-2021-32703

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Source
5.0	MEDIUM	AV:N/AC:L/Au:N/C:P/I:N/A:N	10.0	2.9	nvd@nist.gov
Access Vector: Network Access Complexity: Low Authentication: None Confidentiality Impact: Partial Integrity Impact: None Availability Impact: None
5.3	MEDIUM	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N	3.9	1.4	nvd@nist.gov
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: Low Integrity: None Availability: None
5.3	MEDIUM	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N	3.9	1.4	security-advisories@github.com
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: None Integrity: Low Availability: None

CWE ids for CVE-2021-32703

CWE-307 Improper Restriction of Excessive Authentication Attempts

The product does not implement sufficient measures to prevent multiple failed authentication attempts within a short time frame, making it more susceptible to brute force attacks.

Assigned by: nvd@nist.gov (Secondary)
CWE-799 Improper Control of Interaction Frequency

The product does not properly limit the number or frequency of interactions that it has with an actor, such as the number of incoming requests.

Assigned by: security-advisories@github.com (Primary)

References for CVE-2021-32703

https://hackerone.com/reports/1173684

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https://security.gentoo.org/glsa/202208-17

Nextcloud: Multiple Vulnerabilities (GLSA 202208-17) — Gentoo security
Third Party Advisory

CVEs referencing this url
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BVZS26RDME2DYTKET5AECRIZDFUGR2AZ/

[SECURITY] Fedora 33 Update: nextcloud-19.0.13-1.fc33 - package-announce - Fedora Mailing-Lists
Mailing List;Third Party Advisory

CVEs referencing this url
https://github.com/nextcloud/server/pull/26945

Add bruteforce protection to the shareinfo endpoint by rullzer · Pull Request #26945 · nextcloud/server · GitHub
Patch;Third Party Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-375p-cxxq-gc9p

Lack of ratelimit on shareinfo endpoint · Advisory · nextcloud/security-advisories · GitHub
Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/J63NBVPR2AQCAWRNDOZSGRY5II4WS2CZ/

[SECURITY] Fedora 34 Update: nextcloud-20.0.11-1.fc34 - package-announce - Fedora Mailing-Lists
Mailing List;Third Party Advisory

CVEs referencing this url

Products affected by CVE-2021-32703

Fedoraproject » Fedora » Version: 33
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
Matching versions
Fedoraproject » Fedora » Version: 34
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
Matching versions
Nextcloud » Nextcloud Server
Versions before (<) 19.0.13
cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*
Matching versions
Nextcloud » Nextcloud Server
Versions from including (>=) 20.0.0 and before (<) 20.0.11
cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*
Matching versions
Nextcloud » Nextcloud Server
Versions from including (>=) 21.0.0 and before (<) 21.0.3
cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*
Matching versions