CVE-2025-24813: Apache Tomcat: Potential RCE and/or information disclosure and/or information corruption with partial PUT

[Mark Thomas <markt () apache org>]

Severity: important

Affected versions:

- Apache Tomcat 11.0.0-M1 through 11.0.2
- Apache Tomcat 10.1.0-M1 through 10.1.34
- Apache Tomcat 9.0.0.M1 through 9.0.98

Description:

Path Equivalence: 'file.Name' (Internal Dot) leading to Remote Code 
Execution and/or Information disclosure and/or malicious content added 
to uploaded files via write enabled Default Servlet in Apache Tomcat.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.2, from 
10.1.0-M1 through 10.1.34, from 9.0.0.M1 through 9.0.98.

If all of the following were true, a malicious user was able to view 
  security sensitive files and/or inject content into those files:
- writes enabled for the default servlet (disabled by default)
- support for partial PUT (enabled by default)
- a target URL for security sensitive uploads that was a sub-directory 
of a target URL for public uploads
- attacker knowledge of the names of security sensitive files being uploaded
- the security sensitive files also being uploaded via partial PUT

If all of the following were true, a malicious user was able to 
perform remote code execution:
- writes enabled for the default servlet (disabled by default)
- support for partial PUT (enabled by default)
- application was using Tomcat's file based session persistence with the 
default storage location
- application included a library that may be leveraged in a 
deserialization attack

Users are recommended to upgrade to version 11.0.3, 10.1.35 or 9.0.98, 
which fixes the issue.

Credit:

COSCO Shipping Lines DIC (finder)
sw0rd1ight (https://github.com/sw0rd1ight) (finder)

References:

https://lists.apache.org/thread/j5fkjv2k477os90nczf2v9l61fb0kkgq
https://tomcat.apache.org/
https://www.cve.org/CVERecord?id=CVE-2025-24813