The Apache HTTP Server 2.4.18 through 2.4.20, when mod_http2 and mod_ssl are enabled, does not properly recognize the SSLVerifyClient require directive for HTTP/2 request authorization, which allows remote attackers to bypass intended access restrictions by leveraging the ability to send multiple requests over a single connection and aborting a renegotiation.
The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Http_server | Apache | 2.4.18 (including) | 2.4.18 (including) |
| Http_server | Apache | 2.4.19 (including) | 2.4.19 (including) |
| Http_server | Apache | 2.4.20 (including) | 2.4.20 (including) |
| Red Hat Software Collections for Red Hat Enterprise Linux 6 | RedHat | httpd24-httpd-0:2.4.18-11.el6 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 6.6 EUS | RedHat | httpd24-httpd-0:2.4.18-11.el6 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 6.7 EUS | RedHat | httpd24-httpd-0:2.4.18-11.el6 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7 | RedHat | httpd24-httpd-0:2.4.18-11.el7 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.1 EUS | RedHat | httpd24-httpd-0:2.4.18-11.el7 | * |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.2 EUS | RedHat | httpd24-httpd-0:2.4.18-11.el7 | * |
| Apache2 | Ubuntu | upstream | * |
Access control involves the use of several protection mechanisms such as:
When any mechanism is not applied or otherwise fails, attackers can compromise the security of the product by gaining privileges, reading sensitive information, executing commands, evading detection, etc. There are two distinct behaviors that can introduce access control weaknesses: