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A buffer underflow bug in PHP could allow remote code-execution (RCE) on targeted NGINX servers.
First discovered during a hCorem Capture the Flag competition in September, the bug (CVE-2019-11043) exists in the FastCGI directive used in some PHP implementations on NGINX servers, according to researchers at Wallarm.
PHP powers about 30 percent of modern websites, including popular web platforms like WordPress and Drupal – but NGINX servers are only vulnerable if they have PHP-FPM enabled (a non-default optimization feature that allows servers to execute scripts faster).
The issue is patched in PHP versions 7.3.11, 7.2.24 and 7.1.33, which were released last week.
 
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