|Type||Arbitrary code execution|
A buffer underflow issue has been found in the php-fpm component of php before 7.3.11, 7.2.24 and 7.1.33, leading to remote code execution in certain nginx + php-fpm configurations. This vulnerability can be exploited if the fastcgi_split_path_info directive contains a regexp that can be broken by an attacker by supplying %0a in the path info which results in the fastcgi_param PATH_INFO being empty.
|25 Oct 2019||ASA-201910-14||AVG-1052||php||Critical||arbitrary code execution|
Workaround: If nginx and php-fpm share the same filesystem, one can first check the script actually exists, so the malicious request will never make it to php-fpm (it is usually done using something like `try_files $uri =404`). Or there may be cgi.fix_pathinfo=0 which will also prevent exploitation.