CVE-2021-43980

Summary

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.

Affected Software

Weaknesses

• CWE-362: CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

ADP Enrichment

CVE Program Container

Additional References

• https://lists.apache.org/thread/3jjqbsp6j88b198x5rmg99b1qr8ht3g3
• http://www.openwall.com/lists/oss-security/2022/09/28/1
• https://lists.debian.org/debian-lts-announce/2022/10/msg00029.html
• https://www.debian.org/security/2022/dsa-5265

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: partial

References

• https://lists.apache.org/thread/3jjqbsp6j88b198x5rmg99b1qr8ht3g3
• http://www.openwall.com/lists/oss-security/2022/09/28/1
• https://lists.debian.org/debian-lts-announce/2022/10/msg00029.html
• https://www.debian.org/security/2022/dsa-5265

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