Time-of-check Time-of-use (TOCTOU) Race Condition Affecting org.apache.tomcat:tomcat-catalina package, versions [9.0.0.M1,9.0.98)[10.1.0-M1,10.1.34)[11.0.0-M1,11.0.2)

org.apache.tomcat:tomcat-catalina is a Tomcat Servlet Engine Core Classes and Standard implementations.

Affected versions of this package are vulnerable to Time-of-check Time-of-use (TOCTOU) Race Condition due to imcomplete mitigation advice associated with CVE-2024-50379 in the file-handling process with servlet write enabled.

In addition to upgrading to the fixed version, users are advised to apply the following mitigations, depending on which version of Java they are using with Tomcat :

1. running on Java 8 or Java 11: the system property sun.io.useCanonCaches must be explicitly set to false (it defaults to true)

2. running on Java 17: the system property sun.io.useCanonCaches, if set, must be set to false (it defaults to false)

3. running on Java 21 onwards: no further configuration is required (the system property and the problematic cache have been removed)

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