The OWASP ModSecurity Core Rule Set (CRS) is affected by a response body bypass. A client can issue an HTTP Accept header field containing an optional charset parameter in order to receive the response in an encoded form. Depending on the charset, this response can not be decoded by the web application firewall. A restricted resource, access to which would ordinarily be detected, may therefore bypass detection. The legacy CRS versions 3.0.x and 3.1.x are affected, as well as the currently supported versions 3.2.1 and 3.3.2. Integrators and users are advised to upgrade to 3.2.2 and 3.3.3 respectively.
The product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Owasp_modsecurity_core_rule_set | Owasp | 3.0.0 (including) | 3.2.2 (excluding) |
| Owasp_modsecurity_core_rule_set | Owasp | 3.3.0 (including) | 3.3.3 (excluding) |
| Modsecurity-crs | Ubuntu | bionic | * |
| Modsecurity-crs | Ubuntu | kinetic | * |
| Modsecurity-crs | Ubuntu | lunar | * |
| Modsecurity-crs | Ubuntu | mantic | * |
| Modsecurity-crs | Ubuntu | trusty | * |
| Modsecurity-crs | Ubuntu | xenial | * |