CVE-2022-41882 Nextcloud Desktop vulnerable to code injection via malicious link
Attackers can execute arbitrary code on Windows systems by tricking users into clicking malicious nc:// links in synced files.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2022-41882?
CVE-2022-41882 is a medium-severity code injection vulnerability in nextcloud security-advisories, published on 11 Nov 2022. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
The Nextcloud Desktop Client is a tool to synchronize files from Nextcloud Server with your computer. In version 3.6.0, if a user received a malicious file share and has it synced locally or the virtual filesystem enabled and clicked a nc://open/ link it will open the default editor for the file type of the shared file, which on Windows can also sometimes mean that a file depending on the type, e.g. "vbs", is being executed. It is recommended that the Nextcloud Desktop client is upgraded to version 3.6.1. As a workaround, users can block the Nextcloud Desktop client 3.6.0 by setting the `minimum.supported.desktop.version` system config to `3.6.1` on the server, so new files designed to use this attack vector are not downloaded anymore. Already existing files can still be used. Another workaround would be to enforce shares to be accepted by setting the `sharing.force_share_accept` system config to `true` on the server, so new files designed to use this attack vector are not downloaded anymore. Already existing shares can still be abused.
Weakness: CWE-94
Which versions are affected by CVE-2022-41882?
It affects 1 product.
Products include Nextcloud Desktop.
How do I fix CVE-2022-41882?
Upgrade to a fixed version.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2022-41882 being exploited?
There is no known exploitation of CVE-2022-41882 in the wild and no public exploit code.
Other vulnerabilities in nextcloud security-advisories
- CVE-2024-46958 Misconfiguration in n/a
- CVE-2020-8224 Code injection in Desktop Client
- CVE-2020-8225 Information disclosure in Desktop Client
- CVE-2021-37617 Untrusted Search Path in Nextcloud Desktop Client
- CVE-2023-28999 Nextcloud: Lack of authenticity of metadata keys allows a malicious server to gain access to E2EE folders
Sources
Also known as DEBIAN-CVE-2022-41882, GHSA-3w86-rm38-8w63, UBUNTU-CVE-2022-41882.