Vulnerability identifier: #VU54667

Vulnerability risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-32705

CWE-ID: CWE-799

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Nextcloud Server
Client/Desktop applications / Messaging software

Vendor: Nextcloud

Description

The vulnerability allows a remote attacker to gain access to sensitive information on the target system.

The vulnerability exists due to a lack of ratelimiting on the public DAV endpoint. A remote attacker can enumerate potentially valid share tokens or credentials.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Nextcloud Server: 19.0.0 - 21.0.2

---

External links
http://github.com/nextcloud/security-advisories/security/advisories/GHSA-fjv7-283f-5m54/

---

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.