CVE-2016-8745
HighSummary
A bug in the error handling of the send file code for the NIO HTTP connector in Apache Tomcat leads to the same Processor object being added to the Processor cache multiple times. This can result in the same Processor being used for concurrent requests, leading to information leakage between requests.
Risk Assessment
Sharing a Processor can result in information leakage, including session IDs and response body, posing a serious threat to user data security.
Recommendation
It is recommended to upgrade to the latest version of Apache Tomcat to mitigate this vulnerability and to monitor logs for potential incidents related to information leakage.
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Original NVD description (English source)
A bug in the error handling of the send file code for the NIO HTTP connector in Apache Tomcat 9.0.0.M1 to 9.0.0.M13, 8.5.0 to 8.5.8, 8.0.0.RC1 to 8.0.39, 7.0.0 to 7.0.73 and 6.0.16 to 6.0.48 resulted in the current Processor object being added to the Processor cache multiple times. This in turn meant that the same Processor could be used for concurrent requests. Sharing a Processor can result in information leakage between requests including, not not limited to, session ID and the response body. The bug was first noticed in 8.5.x onwards where it appears the refactoring of the Connector code for 8.5.x onwards made it more likely that the bug was observed. Initially it was thought that the 8.5.x refactoring introduced the bug but further investigation has shown that the bug is present in all currently supported Tomcat versions.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

