CVE-2021-43980

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.

Affected packages (5)

• Bitnami/tomcat>= 8.5.0, < 8.5.78, >= 9.0.0, < 9.0.61, >= 10.0.0, < 10.0.19
• Debian/tomcat9from 0, < 9.0.43-2~deb11u4
• Debian/tomcat9from 0, < 9.0.31-1~deb10u7
• Debian/tomcat9from 0, < 9.0.43-2~deb11u4
• Maven/org.apache.tomcat:tomcat>= 8.5.0, < 8.5.78

CVSS scores

References (14)

• ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2021-43980
• ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2021-43980
• PATCHhttps://github.com/apache/tomcat
• WEBhttps://github.com/apache/tomcat/commit/170e0f792bd18ff031677890ba2fe50eb7a376c1
• WEBhttps://github.com/apache/tomcat/commit/17f177eeb7df5938f67ef9ea580411b120195f13
• WEBhttps://github.com/apache/tomcat/commit/4a00b0c0890538b9d3107eef8f2e0afadd119beb
• WEBhttps://github.com/apache/tomcat/commit/9651b83a1d04583791525e5f0c4c9089f678d9fc
• WEBhttps://lists.apache.org/thread/3jjqbsp6j88b198x5rmg99b1qr8ht3g3
• WEBhttps://lists.debian.org/debian-lts-announce/2022/10/msg00029.html
• WEBhttps://tomcat.apache.org/security-10.html
• WEBhttps://tomcat.apache.org/security-8.html
• WEBhttps://tomcat.apache.org/security-9.html
• WEBhttps://www.debian.org/security/2022/dsa-5265
• WEBhttp://www.openwall.com/lists/oss-security/2022/09/28/1