CVE-2021-43980: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

September 28, 2022 (updated November 10, 2022)

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.

References

www.openwall.com/lists/oss-security/2022/09/28/1
lists.apache.org/thread/3jjqbsp6j88b198x5rmg99b1qr8ht3g3
nvd.nist.gov/vuln/detail/CVE-2021-43980

Code Behaviors & Features

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