REDHAT-BUG-2333521: Race Condition
Time-of-check Time-of-use (TOCTOU) Race Condition vulnerability in Apache Tomcat.
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.
The mitigation for CVE-2024-50379 was incomplete.
Users running Tomcat on a case insensitive file system with the default servlet write enabled (readonly initialisation 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: - running on Java 8 or Java 11: the system property sun.io.useCanonCaches must be explicitly set to false (it defaults to true) - running on Java 17: the system property sun.io.useCanonCaches, if set, must be set to false (it defaults to false) - running on Java 21 onwards: no further configuration is required (the system property and the problematic cache have been removed)
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.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Apache Tomcatto a version that resolves this vulnerability.Fixed in 11.0.3 - Upgrade
Upgrade
Apache Tomcatto a version that resolves this vulnerability.Fixed in 10.1.35 - Upgrade
Upgrade
Apache Tomcatto a version that resolves this vulnerability.Fixed in 9.0.99 - Configuration
If running Tomcat on Java 8 or Java 11, explicitly set the system property sun.io.useCanonCaches=false.
Java (system property) / Apache Tomcat sun.io.useCanonCaches = false
Event History
Frequently Asked Questions
What is the severity of REDHAT-BUG-2333521?
The severity of REDHAT-BUG-2333521 is critical due to its impact on the execution flow in Apache Tomcat.
Which versions of Apache Tomcat are affected by REDHAT-BUG-2333521?
REDHAT-BUG-2333521 affects Apache Tomcat versions from 11.0.0-M1 through 11.0.1, from 10.1.0-M1 through 10.1.33, and from 9.0.0.M1 through 9.0.97.
How do I fix REDHAT-BUG-2333521?
To resolve REDHAT-BUG-2333521, upgrade Apache Tomcat to a version that has included the necessary security patches.
What type of vulnerability is REDHAT-BUG-2333521?
REDHAT-BUG-2333521 is a Time-of-check Time-of-use (TOCTOU) race condition vulnerability.
What potential risks does REDHAT-BUG-2333521 pose?
REDHAT-BUG-2333521 can allow an attacker to exploit race conditions, potentially leading to unauthorized access or manipulation of resources.