#VU23810 Incorrect default permissions in Dropbox for Windows

Vulnerability identifier: #VU23810

Vulnerability risk: Low

CVSSv4.0: 7.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Clear]

CVE-ID: N/A

CWE-ID: CWE-276

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Dropbox for Windows
Client/Desktop applications / File managers, FTP clients

Vendor: Dropbox

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to incorrect default permissions for files and folders that are set by DropBoxUpdater service. A local user with access to the system can view contents of files and directories or modify them. Successful exploitation of the vulnerability may allow an attacker to gain elevated privilege on the system.

Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

Dropbox for Windows: 25.4.28 - 87.4.138

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External links
http://decoder.cloud/2019/12/18/from-dropboxupdater-to-nt-authoritysystem/

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.