CVE-2023-34396 Apache Struts: DoS via OOM owing to no sanity limit on normal form fields in multipart forms

What is CVE-2023-34396?

CVE-2023-34396 is a medium-severity denial of service vulnerability in Apache Struts, published on 14 Jun 2023. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

Allocation of Resources Without Limits or Throttling vulnerability in Apache Software Foundation Apache Struts.This issue affects Apache Struts: through 2.5.30, through 6.1.2.

Upgrade to Struts 2.5.31 or 6.1.2.1 or greater

Weakness: CWE-770

Which versions are affected by CVE-2023-34396?

8 open source packages ship an affected version, including org.apache.struts:struts2-core, org.apache.struts:struts-core and struts:struts. It affects 1 product.

Products include Apache Struts.

How do I fix CVE-2023-34396?

Upgrade org.apache.struts:struts2-core to a fixed version for your release line: 2.5.31 or 6.1.2.1.

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-2023-34396 being exploited?

There is no known exploitation of CVE-2023-34396 in the wild and no public exploit code.

Other vulnerabilities in Apache Struts

• CVE-2020-17530 Apache Struts Remote Code Execution Exploited Critical 9.8
• CVE-2017-9791 Apache Struts 1 Improper Input Validation Exploited Critical 9.8
• CVE-2017-5638 Apache Struts Remote Code Execution Exploited Critical 9.8
• CVE-2012-0391 Apache Struts 2 Improper Input Validation Exploited Critical 9.8
• CVE-2018-11776 Apache Struts Remote Code Execution Exploited High 8.1

All Apache Struts vulnerabilities

Sources

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

Also known as GHSA-4g42-gqrg-4633.