CVE-2024-9026

A flaw was found in PHP-FPM, the FastCGI Process Manager. This vulnerability can allow an attacker to manipulate or remove up to 4 characters from log messages via crafted log content, potentially polluting or altering the final log. If PHP-FPM is configured to use syslog output, further log data manipulation is possible via the same vector.

In PHP versions 8.1.* before 8.1.30, 8.2.* before 8.2.24, 8.3.* before 8.3.12, when using PHP-FPM SAPI and it is configured to catch workers output through catch_workers_output = yes, it may be possible to pollute the final log or remove up to 4 characters from the log messages by manipulating log message content. Additionally, if PHP-FPM is configured to use syslog output, it may be possible to further remove log data using the same vulnerability.

It was discovered that PHP incorrectly handled parsing multipart form data. A remote attacker could possibly use this issue to inject payloads and cause PHP to ignore legitimate data. It was discovered that PHP incorrectly handled the cgi.force_redirect configuration option due to environment variable collisions. In certain configurations, an attacker could possibly use this issue bypass force_redirect restrictions.