#VU46710 Code Injection in desktop - CVE-2020-8140

Vulnerability identifier: #VU46710

Vulnerability risk: Low

CVSSv4.0: 6.2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Clear]

CVE-ID: CVE-2020-8140

CWE-ID: CWE-94

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
desktop
Other software / Other software solutions

Vendor: Nextcloud

Description

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

The vulnerability exists due to improper input validation in Nextcloud Desktop Client for macOS when starting the client with DYLD_INSERT_LIBRARIES set in the environment. A local user can inject and execute arbitrary library on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

desktop: 2.6.0 - 2.6.2

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External links
https://hackerone.com/reports/633266
https://nextcloud.com/security/advisory/?id=NC-SA-2020-016

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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.