Multiple vulnerabilities in Nextcloud Richdocuments

Published: 2021-09-07

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2021-37628 CVE-2021-37629
CWE-ID	CWE-799
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	Nextcloud Richdocuments Web applications / Modules and components for CMS
Vendor	Nextcloud

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Authorization bypass through user-controlled key

EUVDB-ID: #VU56361

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-37628

CWE-ID: N/A

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to the File Drop features ("Upload Only" public link shares in Nextcloud) can be bypassed. A remote attacker can read arbitrary files in such a share.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Nextcloud Richdocuments: 3.8.0 - 4.2.0

External links

http://github.com/nextcloud/security-advisories/security/advisories/GHSA-pxhh-954f-8w7w/

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.

2) Improper control of interaction frequency

EUVDB-ID: #VU56364

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-2021-37629

CWE-ID: CWE-799 - Improper Control of Interaction Frequency