Privilege escalation in Nextcloud Desktop client for macOS



| Updated: 2020-09-15
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2020-8140
CWE-ID CWE-94
Exploitation vector Local
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
 desktop
Other software / Other software solutions

Vendor Nextcloud

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Code Injection

EUVDB-ID: #VU46710

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 - Improper Control of Generation of Code ('Code Injection')

Exploit availability: No

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 update from vendor's website.

Vulnerable software versions

desktop: 2.6.0 - 2.6.2

CPE2.3 External links

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


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.



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