CVE-2020-8293 Denial of service in Nextcloud Server
Attackers can cause denial of service by storing unlimited data in workflow rules due to missing input validation in Nextcloud Server.
- 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-2020-8293?
CVE-2020-8293 is a medium-severity denial of service vulnerability in Nextcloud Nextcloud Server, published on 26 Jan 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A missing input validation in Nextcloud Server before 20.0.2, 19.0.5, 18.0.11 allows users to store unlimited data in workflow rules causing load and potential DDoS on later interactions and usage with those rules.
Weakness: CWE-400
Which versions are affected by CVE-2020-8293?
It affects 1 product.
Products include Nextcloud Nextcloud Server.
How do I fix CVE-2020-8293?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2020-8293 being exploited?
There is no known exploitation of CVE-2020-8293 in the wild and no public exploit code.
Other vulnerabilities in Nextcloud Nextcloud Server
- CVE-2021-32802 Preview generation used third-party library not suited for user-generated content in Nextcloud server
- CVE-2023-26482 Scope of workflow operations is not validated in nextcloud server
- CVE-2018-3775 Auth bypass in Nextcloud Server
- CVE-2023-35172 Nextcloud Server password reset endpoint is not brute force protected
- CVE-2023-32320 Nextcloud Server's brute force protection allows someone to send more requests than intended
Sources
Also known as GHSA-g8q5-cq4v-2qq7.