Date: Wed, 20 May 2020 16:22:21 +0100 From: Mark Thomas <markt@...che.org> To: oss-security@...ts.openwall.com Subject: CVE-2020-9484 Apache Tomcat Remote Code Execution via session persistence CVE-2020-9484 Apache Tomcat Remote Code Execution via session persistence Severity: High Vendor: The Apache Software Foundation Versions Affected: Apache Tomcat 10.0.0-M1 to 10.0.0-M4 Apache Tomcat 9.0.0.M1 to 9.0.34 Apache Tomcat 8.5.0 to 8.5.54 Apache Tomcat 7.0.0 to 7.0.103 Description: If: a) an attacker is able to control the contents and name of a file on the server; and b) the server is configured to use the PersistenceManager with a FileStore; and c) the PersistenceManager is configured with sessionAttributeValueClassNameFilter="null" (the default unless a SecurityManager is used) or a sufficiently lax filter to allow the attacker provided object to be deserialized; and d) the attacker knows the relative file path from the storage location used by FileStore to the file the attacker has control over; then, using a specifically crafted request, the attacker will be able to trigger remote code execution via deserialization of the file under their control. Note that all of conditions a) to d) must be true for the attack to succeed. Mitigation: - Upgrade to Apache Tomcat 10.0.0-M5 or later - Upgrade to Apache Tomcat 9.0.35 or later - Upgrade to Apache Tomcat 8.5.55 or later - Upgrade to Apache Tomcat 7.0.104 or later Alternatively, users may configure the PersistenceManager with an appropriate value for sessionAttributeValueClassNameFilter to ensure that only application provided attributes are serialized and deserialized. Credit: This issue was discovered and reported responsibly to the Apache Tomcat Security Team by report by jarvis threedr3am of pdd security research References:  http://tomcat.apache.org/security-10.html  http://tomcat.apache.org/security-9.html  http://tomcat.apache.org/security-8.html  http://tomcat.apache.org/security-7.html
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