CVE-2021-43980
unknown
CVSS v3
—
CVSS v2
—
VIR risk
—
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.
Predictions
Exploit likelihood
30%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2021-43980
Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2021-43980.html
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| sles | affected | | |
| debian | bookworm | fixed | 9.0.62-1 |
| debian | bullseye | fixed | 9.0.43-2~deb11u4 |
| debian | forky | fixed | 9.0.62-1 |
| debian | sid | fixed | 9.0.62-1 |
| debian | trixie | fixed | 9.0.62-1 |
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| Maven | org.apache.tomcat:tomcat | >=8.5.0,<8.5.78 | 8.5.78 |
| Maven | org.apache.tomcat:tomcat | >=9.0.0-M1,<9.0.62 | 9.0.62 |
| Maven | org.apache.tomcat:tomcat | >=10.0.0-M1,<10.0.20 | 10.0.20 |
| Maven | org.apache.tomcat:tomcat | >=10.1.0-M1,<10.1.0-M14 | 10.1.0-M14 |
References
- https://www.suse.com/security/cve/CVE-2021-43980.html
- https://nvd.nist.gov/vuln/detail/CVE-2021-43980
- https://github.com/apache/tomcat/commit/170e0f792bd18ff031677890ba2fe50eb7a376c1
- https://github.com/apache/tomcat/commit/17f177eeb7df5938f67ef9ea580411b120195f13
- https://github.com/apache/tomcat/commit/4a00b0c0890538b9d3107eef8f2e0afadd119beb
- https://github.com/apache/tomcat/commit/9651b83a1d04583791525e5f0c4c9089f678d9fc
- https://github.com/apache/tomcat
- https://lists.apache.org/thread/3jjqbsp6j88b198x5rmg99b1qr8ht3g3
- https://lists.debian.org/debian-lts-announce/2022/10/msg00029.html
- https://tomcat.apache.org/security-10.html
- https://tomcat.apache.org/security-8.html
- https://tomcat.apache.org/security-9.html
- https://www.debian.org/security/2022/dsa-5265
- http://www.openwall.com/lists/oss-security/2022/09/28/1
- https://security-tracker.debian.org/tracker/CVE-2021-43980
Verify integrity in audit chain (admin only). AS-IS.