#VU46082 Path traversal in desktop - CVE-2020-8227

Vulnerability identifier: #VU46082

Vulnerability risk: Medium

CVSSv4.0: 5.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-8227

CWE-ID: CWE-22

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
desktop
Other software / Other software solutions

Vendor: Nextcloud

Description

The vulnerability allows a remote privileged user to execute arbitrary code.

Missing sanitization of a server response in Nextcloud Desktop Client 2.6.4 for Linux allowed a malicious Nextcloud Server to store files outside of the dedicated sync directory.

Mitigation
Install update from vendor's website.

Vulnerable software versions

desktop: 2.0.0 - 2.6.4

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External links
https://hackerone.com/reports/590319
https://nextcloud.com/security/advisory/?id=NC-SA-2020-032

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated privileged user via the Internet.

Is there known malware, which exploits this vulnerability?

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