CVE-2024-56337

Time-of-check Time-of-use (TOCTOU) Race Condition vulnerability in Apache Tomcat.<br /> <br /> This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.1, from 10.1.0-M1 through 10.1.33, from 9.0.0.M1 through 9.0.97.<br /> <br /> The mitigation for CVE-2024-50379 was incomplete.<br /> <br /> Users running Tomcat on a case insensitive file system with the default servlet write enabled (readonly initialisation <br /> parameter set to the non-default value of false) may need additional configuration to fully mitigate CVE-2024-50379 depending on which version of Java they are using with Tomcat:<br /> - running on Java 8 or Java 11: the system property sun.io.useCanonCaches must be explicitly set to false (it defaults to true)<br /> - running on Java 17: the system property sun.io.useCanonCaches, if set, must be set to false (it defaults to false)<br /> - running on Java 21 onwards: no further configuration is required (the system property and the problematic cache have been removed)<br /> <br /> Tomcat 11.0.3, 10.1.35 and 9.0.99 onwards will include checks that sun.io.useCanonCaches is set appropriately before allowing the default servlet to be write enabled on a case insensitive file system. Tomcat will also set sun.io.useCanonCaches to false by default where it can.