CVE-2021-43980

NameCVE-2021-43980
DescriptionThe 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub advisories/code/issues, web search, more)
ReferencesDLA-3160-1, DSA-5265-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
tomcat9 (PTS)buster9.0.31-1~deb10u6vulnerable
buster (security)9.0.31-1~deb10u7fixed
bullseye9.0.43-2~deb11u3vulnerable
bullseye (security)9.0.43-2~deb11u4fixed
bookworm9.0.68-1.1fixed
sid9.0.70-1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
tomcat8source(unstable)(unfixed)
tomcat9sourcebuster9.0.31-1~deb10u7DLA-3160-1
tomcat9sourcebullseye9.0.43-2~deb11u4DSA-5265-1
tomcat9source(unstable)9.0.62-1

Notes

https://lists.apache.org/thread/3jjqbsp6j88b198x5rmg99b1qr8ht3g3
https://github.com/apache/tomcat/commit/170e0f792bd18ff031677890ba2fe50eb7a376c1 (9.0.61)
https://github.com/apache/tomcat/commit/4a00b0c0890538b9d3107eef8f2e0afadd119beb (8.5.78)

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