While investigating bug 64830 it was discovered that Apache Tomcat 10.0.0-M1 to 10.0.0-M9, 9.0.0-M1 to 9.0.39 and 8.5.0 to 8.5.59 could re-use an HTTP request header value from the previous stream received on an HTTP/2 connection for the request associated with the subsequent stream. While this would most likely lead to an error and the closure of the HTTP/2 connection, it is possible that information could leak between requests.
CVE-2020-17527 - High Severity Vulnerability
Core Tomcat implementation
Library home page: https://tomcat.apache.org/
Path to dependency file: /pom.xml
Path to vulnerable library: /20201127105057_JYADOJ/downloadResource_XKWWQX/20201127105927/tomcat-embed-core-9.0.27.jar
Dependency Hierarchy: - :x: **tomcat-embed-core-9.0.27.jar** (Vulnerable Library)
Found in HEAD commit: 26994796809a3a8687a975e3361495d457afe47c
Found in base branch: master
While investigating bug 64830 it was discovered that Apache Tomcat 10.0.0-M1 to 10.0.0-M9, 9.0.0-M1 to 9.0.39 and 8.5.0 to 8.5.59 could re-use an HTTP request header value from the previous stream received on an HTTP/2 connection for the request associated with the subsequent stream. While this would most likely lead to an error and the closure of the HTTP/2 connection, it is possible that information could leak between requests.
Publish Date: 2020-12-03
URL: CVE-2020-17527
Base Score Metrics: - Exploitability Metrics: - Attack Vector: Network - Attack Complexity: Low - Privileges Required: None - User Interaction: None - Scope: Unchanged - Impact Metrics: - Confidentiality Impact: High - Integrity Impact: None - Availability Impact: None
For more information on CVSS3 Scores, click here.Type: Upgrade version
Origin: https://lists.apache.org/thread/0nl7j4lr5j6jvwh45d2lhtjysqvnwnqx
Release Date: 2020-12-03
Fix Resolution: 9.0.40
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