CVE-2023-28644 Reference fetch can saturate the server bandwidth for 10 seconds in nextcloud server

What is CVE-2023-28644?

CVE-2023-28644 is a medium-severity denial of service vulnerability in Nextcloud Nextcloud Server, published on 30 Mar 2023. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

Official description

Nextcloud server is an open source home cloud implementation. In releases of the 25.0.x branch before 25.0.3 an inefficient fetch operation may impact server performances and/or can lead to a denial of service. This issue has been addressed and it is recommended that the Nextcloud Server is upgraded to 25.0.3. There are no known workarounds for this vulnerability.

Weakness: CWE-400

Which versions are affected by CVE-2023-28644?

It affects 1 product.

Products include Nextcloud Nextcloud Server.

How do I fix CVE-2023-28644?

No fix has been published for CVE-2023-28644 yet. Limit exposure of the affected software until one is available.

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-2023-28644 being exploited?

There is no known exploitation of CVE-2023-28644 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 Critical 9.3
• CVE-2023-26482 Scope of workflow operations is not validated in nextcloud server Critical 9.1
• CVE-2018-3775 Auth bypass in Nextcloud Server High 8.8
• CVE-2023-35172 Nextcloud Server password reset endpoint is not brute force protected High 8.7
• CVE-2023-32320 Nextcloud Server's brute force protection allows someone to send more requests than intended High 8.7

All Nextcloud Nextcloud Server vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-9wmj-gp8v-477j.