Authorization bypass through user-controlled key in Nextcloud Deck
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 1 |
| CVE-ID | CVE-2021-37631 |
| CWE-ID | N/A |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software Subscribe |
Deck Mobile applications / Apps for mobile phones |
| Vendor | Nextcloud |
Security Bulletin
This security bulletin contains one medium risk vulnerability.
1) Authorization bypass through user-controlled key
EUVDB-ID: #VU56355
Risk: Medium
CVSSv3.1: 5.5 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-37631
CWE-ID: N/A
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to compromise the target system.
The vulnerability exists due to the affected application does not properly check membership of users in a Circle. A remote authenticated attacker can gain access to boards that have been shared with a Circle, even if the user was not a member of the circle.
MitigationInstall updates from vendor's website.
Vulnerable software versionsDeck: 1.2.0 - 1.5.0
External linkshttp://github.com/nextcloud/security-advisories/security/advisories/GHSA-4mxp-j277-82hr/
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.
How the attacker can exploit this vulnerability?
The attacker would have to trick the victim to perform certain actions on the device.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
