The simplified implementation of blocking reads and writes introduced in Tomcat 10 and back-ported to Tomcat 9.0.47 onwards exposed a long standing (but extremely hard to trigger) concurrency bug in Apache Tomcat 10.1.0 to 10.1.0-M12, 10.0.0-M1 to 10.0.18, 9.0.0-M1 to 9.0.60 and 8.5.0 to 8.5.77 that could cause client connections to share an Http11Processor instance resulting in responses, or part responses, to be received by the wrong client.
CVE-2021-43980 - Low Severity Vulnerability
Vulnerable Library - tomcat-embed-core-8.5.34.jar
Core Tomcat implementation
Library home page: https://tomcat.apache.org/
Path to dependency file: /t/sub1/pom.xml
Path to vulnerable library: /2/repository/org/apache/tomcat/embed/tomcat-embed-core/8.5.34/tomcat-embed-core-8.5.34.jar
Dependency Hierarchy: - :x: **tomcat-embed-core-8.5.34.jar** (Vulnerable Library)
Found in HEAD commit: 37c7d89138d443bae9926a0184046f8d8c7dda51
Found in base branch: master
Vulnerability Details
The simplified implementation of blocking reads and writes introduced in Tomcat 10 and back-ported to Tomcat 9.0.47 onwards exposed a long standing (but extremely hard to trigger) concurrency bug in Apache Tomcat 10.1.0 to 10.1.0-M12, 10.0.0-M1 to 10.0.18, 9.0.0-M1 to 9.0.60 and 8.5.0 to 8.5.77 that could cause client connections to share an Http11Processor instance resulting in responses, or part responses, to be received by the wrong client.
Publish Date: 2022-09-28
URL: CVE-2021-43980
CVSS 3 Score Details (3.7)
Base Score Metrics: - Exploitability Metrics: - Attack Vector: Network - Attack Complexity: High - Privileges Required: None - User Interaction: None - Scope: Unchanged - Impact Metrics: - Confidentiality Impact: Low - Integrity Impact: None - Availability Impact: None
For more information on CVSS3 Scores, click here.Suggested Fix
Type: Upgrade version
Origin: https://lists.apache.org/thread/3jjqbsp6j88b198x5rmg99b1qr8ht3g3
Release Date: 2022-09-28
Fix Resolution: 8.5.78
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