Bug 2130599 (CVE-2021-43980) - CVE-2021-43980 Apache Tomcat: Information disclosure
Summary: CVE-2021-43980 Apache Tomcat: Information disclosure
Keywords:
Status: NEW
Alias: CVE-2021-43980
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Nobody
QA Contact:
URL:
Whiteboard:
Depends On: 2133649 2133650 2133652 2133653
Blocks: 2130601
TreeView+ depends on / blocked
 
Reported: 2022-09-28 15:08 UTC by Sage McTaggart
Modified: 2024-03-08 18:04 UTC (History)
19 users (show)

Fixed In Version: Tomcat 10.1.0-M14, Tomcat 10.0.20, Tomcat 9.0.62, Tomcat 8.5.78
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Description Sage McTaggart 2022-09-28 15:08:46 UTC 
Severity: important

Description:

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.

Credit:

Thanks to Adam Thomas, Richard Hernandez and Ryan Schmitt for 
discovering the issue and working with the Tomcat security team to 
identify the root cause and appropriate fix.

References:

https://lists.apache.org/thread/3jjqbsp6j88b198x5rmg99b1qr8ht3g3
Comment 3 TEJ RATHI 2022-10-11 05:20:27 UTC 
Created tomcat tracking bugs for this issue:

Affects: epel-all [bug 2133649]
Affects: fedora-all [bug 2133650]
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