nginx: HTTP request smuggling via error pages in http/ngx_http_special_response.c (CVE-2019-20372)
NGINX before 1.17.7, with certain error_page configurations, allows HTTP request smuggling, as demonstrated by the ability of an attacker to read unauthorized web pages in environments where NGINX is being fronted by a load balancer. The bug appeared in 0.7.12.
Fixed In Version:
nginx 1.17.7
References:
Patch:
https://github.com/nginx/nginx/commit/c1be55f97211d38b69ac0c2027e6812ab8b1b94e