CVE-2020-8138 Server-side request forgery in Nextcloud Server
Attackers can exploit missing IPv4-in-IPv6 checks in Nextcloud Server to perform Server-Side Request Forgery via malicious calendar URLs.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2020-8138?
CVE-2020-8138 is a medium-severity server-side request forgery vulnerability in Nextcloud Nextcloud Server, published on 20 Mar 2020. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A missing check for IPv4 nested inside IPv6 in Nextcloud server < 17.0.1, < 16.0.7, and < 15.0.14 allowed a Server-Side Request Forgery (SSRF) vulnerability when subscribing to a malicious calendar URL.
Weakness: CWE-918
Which versions are affected by CVE-2020-8138?
It affects 1 product.
Products include Nextcloud Nextcloud Server.
How do I fix CVE-2020-8138?
No fix has been published for CVE-2020-8138 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2020-8138 being exploited?
There is no known exploitation of CVE-2020-8138 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-27v9-58mg-8v43.