CVE-2021-41256 Intent URI permissions manipulation in nextcloud news-android
A malicious app can exploit Intent URI permissions to gain unauthorized read and write access to non-exported Content Providers in the Nextcloud News Android app.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2021-41256?
CVE-2021-41256 is a medium-severity missing authorization vulnerability in nextcloud news-android, published on 30 Nov 2021. 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
nextcloud news-android is an Android client for the Nextcloud news/feed reader app. In affected versions the Nextcloud News for Android app has a security issue by which a malicious application installed on the same device can send it an arbitrary Intent that gets reflected back, unintentionally giving read and write access to non-exported Content Providers in Nextcloud News for Android. Users should upgrade to version 0.9.9.63 or higher as soon as possible.
Weakness: CWE-829
Which versions are affected by CVE-2021-41256?
It affects 1 product.
Products include Nextcloud News.
How do I fix CVE-2021-41256?
No fix has been published for CVE-2021-41256 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2021-41256 being exploited?
There is no known exploitation of CVE-2021-41256 in the wild and no public exploit code.
Sources
Also known as GHSA-2q9v-q3cc-h9f3.