CVE-2021-41166 Permission bypass in Nextcloud Android App
An unauthorized app can view image thumbnails without required permissions, leading to sensitive information disclosure in the Nextcloud Android client.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-41166?
CVE-2021-41166 is a medium-severity missing authorization vulnerability in nextcloud security-advisories, published on 26 Jan 2022. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The Nextcloud Android app is the Android client for Nextcloud, a self-hosted productivity platform. An issue in versions prior to 3.17.1 may lead to sensitive information disclosure. An unauthorized app that does not have the otherwise required `MANAGE_DOCUMENTS` permission may view image thumbnails for images it does not have permission to view. Version 3.17.1 contains a patch. There are no known workarounds.
Weakness: CWE-276
Which versions are affected by CVE-2021-41166?
1 open source package ship an affected version, including nextcloud. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
nextcloud Bitnami | All versions | 3.17.1 |
Products include Nextcloud Nextcloud.
How do I fix CVE-2021-41166?
Upgrade nextcloud to 3.17.1 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2021-41166 being exploited?
There is no known exploitation of CVE-2021-41166 in the wild and no public exploit code.
Other vulnerabilities in nextcloud security-advisories
- CVE-2019-5454 SQL injection in com.nextcloud.client
- CVE-2021-43863 SQL Injection in FileContentProvider (GHSL-2021-1007)
- CVE-2019-5450 Cross-site scripting in com.nextcloud.client
- CVE-2019-5455 Auth bypass in com.nextcloud.client
- CVE-2021-22905 Information disclosure in Nextcloud Android App (com.nextcloud.client)
Sources
Also known as BIT-nextcloud-2021-41166, GHSA-wrwg-jwpg-r3c4.