Some mod_proxy configurations on Apache HTTP Server versions 2.4.0 through 2.4.55 allow a HTTP Request Smuggling attack.
Configurations are affected when mod_proxy is enabled along with some form of RewriteRule or ProxyPassMatch in which a non-specific pattern matches some portion of the user-supplied request-target (URL) data and is then re-inserted into the proxied request-target using variable substitution. For example, something like:
RewriteEngine on RewriteRule "^/here/(.*)" "http://example.com:8080/elsewhere?$1"; [P] ProxyPassReverse /here/ http://example.com:8080/
Request splitting/smuggling could result in bypass of access controls in the proxy server, proxying unintended URLs to existing origin servers, and cache poisoning. Users are recommended to update to at least version 2.4.56 of Apache HTTP Server.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade mod_ldapUpgrade mod_sslUpgrade mod_proxy_htmlUpgrade mod_mdUpgrade httpd-filesystemUpgrade mod_http2Upgrade httpd-manualUpgrade httpd-toolsUpgrade httpd-coreUpgrade httpd-develUpgrade mod_luaUpgrade httpdUpgrade mod_session | Apr 21, 2023 | Mar 7, 2023 |
| Alpine Linux | — | Upgrade apache2 | Mar 26, 2024 | Mar 7, 2023 |
| Amazon Linux Ami 2 | — | Upgrade mod_mdUpgrade mod_sessionUpgrade mod_sslUpgrade httpd-debuginfoUpgrade httpdUpgrade httpd-filesystemUpgrade mod_proxy_htmlUpgrade httpd-develUpgrade httpd-manualUpgrade httpd-toolsUpgrade mod_ldap | Mar 22, 2023 | Mar 7, 2023 |
| Amazon_linux | — | Upgrade httpd24 | Mar 23, 2023 | Mar 7, 2023 |
| Amazon_linux_2023 | — | Upgrade mod_session-debuginfoUpgrade httpd-filesystemUpgrade mod_sslUpgrade httpd-manualUpgrade mod_proxy_htmlUpgrade mod_proxy_html-debuginfoUpgrade mod_lua-debuginfoUpgrade httpd-debugsourceUpgrade httpd-tools-debuginfoUpgrade mod_sessionUpgrade mod_ldapUpgrade httpd-debuginfoUpgrade mod_ldap-debuginfoUpgrade httpdUpgrade mod_ssl-debuginfoUpgrade httpd-develUpgrade httpd-toolsUpgrade httpd-coreUpgrade mod_luaUpgrade httpd-core-debuginfo | Feb 17, 2025 | Mar 7, 2023 |
| Apache Httpd | — | Upgrade to the latest version of Apache HTTPD | Nov 29, 2023 | Mar 7, 2023 |
| Centos_linux | — | Upgrade httpd-develUpgrade httpd-debuginfoUpgrade httpdUpgrade mod_sslUpgrade mod_ldapUpgrade mod_sessionUpgrade mod_proxy_htmlUpgrade httpd-toolsUpgrade httpd-manual | Apr 6, 2023 | Mar 7, 2023 |
| Debian | — | Upgrade apache2 | Mar 22, 2023 | Mar 7, 2023 |
| Freebsd | — | Upgrade apache24 | Mar 23, 2023 | Mar 11, 2023 |
| Gentoo Linux | — | Upgrade www-servers/apache. | Sep 11, 2023 | Mar 7, 2023 |
| Huawei Euleros 2_0_sp10 | — | Upgrade mod_sslUpgrade httpdUpgrade httpd-filesystemUpgrade httpd-tools | May 9, 2023 | Mar 7, 2023 |
| Huawei Euleros 2_0_sp11 | — | Upgrade httpd-filesystemUpgrade mod_sslUpgrade httpd-toolsUpgrade httpd | Jul 5, 2023 | Mar 7, 2023 |
| Huawei Euleros 2_0_sp5 | — | Upgrade mod_sslUpgrade httpdUpgrade mod_sessionUpgrade httpd-manualUpgrade httpd-develUpgrade httpd-tools | Jun 9, 2023 | Mar 7, 2023 |
| Huawei Euleros 2_0_sp8 | — | Upgrade httpd-filesystemUpgrade httpd-develUpgrade mod_sessionUpgrade mod_sslUpgrade httpd-manualUpgrade httpd-toolsUpgrade httpd | Jun 9, 2023 | Mar 7, 2023 |
| Huawei Euleros 2_0_sp9 | — | Upgrade mod_sslUpgrade httpd-filesystemUpgrade httpd-toolsUpgrade httpd | May 10, 2023 | Mar 7, 2023 |
| Ibm Http_server | — | Apply IBM HTTP Server version 9.0.5.16 or laterApply IBM HTTP Server version 8.5.5.24 or laterApply IBM HTTP Server Interim Fix PH53014 | May 16, 2024 | Apr 4, 2023 |
| Oracle_linux | — | Upgrade mod_http2Upgrade mod_luaUpgrade httpd-toolsUpgrade httpd-filesystemUpgrade mod_proxy_htmlUpgrade mod_mdUpgrade httpd-develUpgrade httpd-coreUpgrade mod_sslUpgrade mod_sessionUpgrade httpd-manualUpgrade httpdUpgrade mod_ldap | Apr 5, 2023 | Mar 7, 2023 |
| Redhat_linux | — | Upgrade httpd-debuginfoUpgrade httpd-toolsUpgrade httpd-develUpgrade mod_http2-debugsourceUpgrade httpdUpgrade mod_sslUpgrade mod_mdUpgrade mod_proxy_htmlUpgrade mod_http2-debuginfoUpgrade mod_ssl-debuginfoUpgrade mod_md-debugsourceUpgrade mod_ldap-debuginfoUpgrade mod_luaUpgrade mod_sessionUpgrade httpd-debugsourceUpgrade mod_ldapUpgrade mod_lua-debuginfoUpgrade httpd-filesystemUpgrade mod_md-debuginfoUpgrade httpd-core-debuginfoUpgrade mod_http2Upgrade httpd-tools-debuginfoUpgrade httpd-manualUpgrade httpd-coreUpgrade mod_session-debuginfoUpgrade mod_proxy_html-debuginfo | Apr 6, 2023 | Mar 7, 2023 |
| Rocky_linux | — | Upgrade mod_luaUpgrade mod_proxy_htmlUpgrade mod_http2-debugsourceUpgrade mod_http2Upgrade mod_md-debugsourceUpgrade mod_ssl-debuginfoUpgrade httpd-core-debuginfoUpgrade httpd-toolsUpgrade httpd-coreUpgrade httpdUpgrade httpd-develUpgrade httpd-debugsourceUpgrade mod_md-debuginfoUpgrade mod_sessionUpgrade mod_sslUpgrade mod_ldapUpgrade mod_lua-debuginfoUpgrade httpd-debuginfoUpgrade mod_session-debuginfoUpgrade mod_http2-debuginfoUpgrade mod_proxy_html-debuginfoUpgrade httpd-tools-debuginfoUpgrade mod_mdUpgrade mod_ldap-debuginfo | Mar 12, 2024 | Mar 7, 2023 |
| Suse | — | Upgrade apache2-workerUpgrade apache2-preforkUpgrade apache2-example-pagesUpgrade apache2Upgrade apache2-docUpgrade apache2-utilsUpgrade apache2-develUpgrade apache2-event | Mar 20, 2023 | Mar 7, 2023 |
| Ubuntu | — | Upgrade apache2Upgrade apache2 (Ubuntu Pro) | Mar 22, 2023 | Mar 7, 2023 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jan 20, 2025 | Mar 7, 2023 |
| Zimbra Collaboration | — | Upgrade Zimbra Collaboration to the latest version | Jan 20, 2025 | Mar 7, 2023 |
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