In Apache HTTP Server 2.4.18-2.4.39, using fuzzed network input, the http/2 session handling could be made to read memory after being freed, during connection shutdown.
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory “belongs” to the code that operates on the new pointer.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Http_server | Apache | 2.4.18 (including) | 2.4.39 (including) |
| JBoss Core Services Apache HTTP Server 2.4.37 SP2 | RedHat | httpd | * |
| JBoss Core Services on RHEL 6 | RedHat | jbcs-httpd24-apr-0:1.6.3-86.jbcs.el6 | * |
| JBoss Core Services on RHEL 6 | RedHat | jbcs-httpd24-brotli-0:1.0.6-21.jbcs.el6 | * |
| JBoss Core Services on RHEL 6 | RedHat | jbcs-httpd24-httpd-0:2.4.37-52.jbcs.el6 | * |
| JBoss Core Services on RHEL 6 | RedHat | jbcs-httpd24-mod_cluster-native-0:1.3.12-41.Final_redhat_2.jbcs.el6 | * |
| JBoss Core Services on RHEL 6 | RedHat | jbcs-httpd24-mod_http2-0:1.11.3-22.jbcs.el6 | * |
| JBoss Core Services on RHEL 6 | RedHat | jbcs-httpd24-openssl-1:1.1.1c-16.jbcs.el6 | * |
| JBoss Core Services on RHEL 7 | RedHat | jbcs-httpd24-apr-0:1.6.3-86.jbcs.el7 | * |
| JBoss Core Services on RHEL 7 | RedHat | jbcs-httpd24-brotli-0:1.0.6-21.jbcs.el7 | * |
| JBoss Core Services on RHEL 7 | RedHat | jbcs-httpd24-httpd-0:2.4.37-52.jbcs.el7 | * |
| JBoss Core Services on RHEL 7 | RedHat | jbcs-httpd24-mod_cluster-native-0:1.3.12-41.Final_redhat_2.jbcs.el7 | * |
| JBoss Core Services on RHEL 7 | RedHat | jbcs-httpd24-mod_http2-0:1.11.3-22.jbcs.el7 | * |
| JBoss Core Services on RHEL 7 | RedHat | jbcs-httpd24-openssl-1:1.1.1c-16.jbcs.el7 | * |
| Red Hat Enterprise Linux 8 | RedHat | httpd:2.4-8030020200818000036.30b713e6 | * |
| Apache2 | Ubuntu | bionic | * |
| Apache2 | Ubuntu | disco | * |
| Apache2 | Ubuntu | esm-infra/bionic | * |
| Apache2 | Ubuntu | trusty | * |
| Apache2 | Ubuntu | upstream | * |