Summary
A zero-day exploit for a vulnerabilities in Apache versions less than 2.4.52 (CVE-2021-44790 & CVE-2021-44224) was publicly released on December 23rd, 2021. A detailed description of the vulnerabilities can be found here:
Centreon conducted an initial assessment across the codebase to determine the impact of this vulnerability.
Impact
CVE-2021-44790
A carefully crafted request body can cause a buffer overflow in the mod_lua multipart parser (r:parsebody() called from Lua scripts). The Apache httpd team is not aware of an exploit for the vulnerabilty though it might be possible to craft one. This issue affects Apache HTTP Server 2.4.51 and earlier.
Centreon does not use mod_lua for its default Apache configuration. If you have not added a third-party configuration, no impact is to be reported.
CVE-2021-44224
A crafted URI sent to httpd configured as a forward proxy (ProxyRequests on) can cause a crash (NULL pointer dereference) or, for configurations mixing forward and reverse proxy declarations, can allow for requests to be directed to a declared Unix Domain Socket endpoint (Server Side Request Forgery). This issue affects Apache HTTP Server 2.4.7 up to 2.4.51 (included).
Centreon does not use proxy declarations for its default Apache configuration. Centreon uses only LocationMatch in its configuration but this is part of Apache core sources. If you have not added a third-party configuration, no impact is to be reported.