CVE-2019-11043 log

Source
Severity Critical
Remote Yes
Type Arbitrary code execution
Description
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.
Group Package Affected Fixed Severity Status Ticket
AVG-1052 php 7.3.10-1 7.3.11-1 Critical Fixed
Date Advisory Group Package Severity Description
25 Oct 2019 ASA-201910-14 AVG-1052 php Critical arbitrary code execution
References
https://bugs.php.net/bug.php?id=78599
https://git.php.net/?p=php-src.git;a=commitdiff;h=19e17d3807e6cc0b1ba9443ec5facbd33a61f8fe
https://github.com/neex/phuip-fpizdam
Notes
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.