Uncontrolled Resource Consumption vulnerability in Apache Tomcat if an HTTP/2 client did not acknowledge the initial settings frame that reduces the maximum permitted concurrent streams.
This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.8, from 10.1.0-M1 through 10.1.42, from 9.0.0.M1 through 9.0.106. The following versions were EOL at the time the CVE was created but are known to be affected: 8.5.0 through 8.5.100. Other EOL versions may also be affected.
Users are recommended to upgrade to version 11.0.9, 10.1.43 or 9.0.107, which fix the issue.
Weakness
The product does not properly control the allocation and maintenance of a limited resource.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Tomcat | Apache | 9.0.0 (including) | 9.0.106 (including) |
| Tomcat | Apache | 10.1.0 (including) | 10.1.42 (including) |
| Tomcat | Apache | 11.0.0 (including) | 11.0.8 (including) |
| Red Hat Enterprise Linux 10 | RedHat | tomcat9-1:9.0.87-5.el10_0.3 | * |
| Red Hat Enterprise Linux 10 | RedHat | tomcat-1:10.1.36-1.el10_0.2 | * |
| Red Hat Enterprise Linux 8 | RedHat | tomcat-1:9.0.87-1.el8_10.6 | * |
| Red Hat Enterprise Linux 8.8 Telecommunications Update Service | RedHat | tomcat-1:9.0.87-1.el8_8.7 | * |
| Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions | RedHat | tomcat-1:9.0.87-1.el8_8.7 | * |
| Red Hat Enterprise Linux 9 | RedHat | tomcat-1:9.0.87-3.el9_6.3 | * |
| Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions | RedHat | tomcat-1:9.0.87-1.el9_2.6 | * |
| Red Hat Enterprise Linux 9.4 Extended Update Support | RedHat | tomcat-1:9.0.87-1.el9_4.6 | * |
| Red Hat JBoss Web Server 5.8.5 | RedHat | jws5-tomcat | * |
| Red Hat JBoss Web Server 5.8 on RHEL 7 | RedHat | jws5-tomcat-0:9.0.87-12.redhat_00011.1.el7jws | * |
| Red Hat JBoss Web Server 5.8 on RHEL 8 | RedHat | jws5-tomcat-0:9.0.87-12.redhat_00011.1.el8jws | * |
| Red Hat JBoss Web Server 5.8 on RHEL 9 | RedHat | jws5-tomcat-0:9.0.87-12.redhat_00011.1.el9jws | * |
| Red Hat JBoss Web Server 6.1.1 | RedHat | jws6-tomcat | * |
| Red Hat JBoss Web Server 6.1 on RHEL 10 | RedHat | jws6-tomcat-0:10.1.36-7.redhat_00008.1.el10jws | * |
| Red Hat JBoss Web Server 6.1 on RHEL 8 | RedHat | jws6-tomcat-0:10.1.36-7.redhat_00008.1.el8jws | * |
| Red Hat JBoss Web Server 6.1 on RHEL 9 | RedHat | jws6-tomcat-0:10.1.36-7.redhat_00008.1.el9jws | * |
| Tomcat10 | Ubuntu | devel | * |
| Tomcat10 | Ubuntu | esm-apps/noble | * |
| Tomcat10 | Ubuntu | noble | * |
| Tomcat10 | Ubuntu | plucky | * |
| Tomcat10 | Ubuntu | questing | * |
| Tomcat10 | Ubuntu | upstream | * |
| Tomcat11 | Ubuntu | devel | * |
| Tomcat11 | Ubuntu | questing | * |
| Tomcat11 | Ubuntu | upstream | * |
| Tomcat9 | Ubuntu | esm-apps/bionic | * |
| Tomcat9 | Ubuntu | esm-apps/focal | * |
| Tomcat9 | Ubuntu | esm-apps/jammy | * |
| Tomcat9 | Ubuntu | jammy | * |
| Tomcat9 | Ubuntu | upstream | * |
Potential Mitigations
Mitigation of resource exhaustion attacks requires that the target system either:
The first of these solutions is an issue in itself though, since it may allow attackers to prevent the use of the system by a particular valid user. If the attacker impersonates the valid user, they may be able to prevent the user from accessing the server in question.
The second solution is simply difficult to effectively institute – and even when properly done, it does not provide a full solution. It simply makes the attack require more resources on the part of the attacker.
Related Attack Patterns
- https://cwe.mitre.org/data/definitions/147.html
- https://cwe.mitre.org/data/definitions/227.html
- https://cwe.mitre.org/data/definitions/492.html