NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_proxy_v2_module and ngx_http_grpc_module modules

Overview

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_proxy_v2_module and ngx_http_grpc_module modules. This vulnerability exists when the proxy_http_version to 2 or grpc_pass directives are used to proxy HTTP/2 traffic, the ignore_invalid_headers directive is set to off, and the large_client_header_buffers directive size is larger than 2 megabytes. A remote, unauthenticated attacker, along with conditions beyond their control, could send large headers while creating an upstream request. This may cause a heap-based buffer overflow in the NGINX worker process leading to a restart. Additionally, attackers can execute code on systems with Address Space Layout Randomization (ASLR) disabled or when the attacker can bypass ASLR.

Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Affected

• dos >= 4.3.0, <= 4.7.0
• dos = 4.9.0
• nginx_gateway_fabric >= 1.3.0, <= 1.6.2
• nginx_gateway_fabric >= 2.0.0, <= 2.6.3
• nginx_ingress_controller >= 3.5.0, <= 3.7.2
• nginx_ingress_controller >= 4.0.0, <= 4.0.1
• nginx_ingress_controller >= 5.0.0, <= 5.5.0
• nginx_instance_manager >= 2.17.0, <= 2.22.0
• nginx_open_source >= 1.0.0, <= 1.30.2
• nginx_open_source >= 1.31.0, <= 1.31.1
• nginx_plus >= 37.0.0.1, < 37.0.2.1
• nginx_plus >= r33, < r36
• nginx_plus = r36
• waf >= 4.10.0, <= 4.16.0
• waf >= 5.2.0, <= 5.8.0
• waf >= 5.9.0, <= 5.13.1
• discovery
• hardened_images
• update_infrastructure >= 5.0, < 5.2
• enterprise_linux = 8.0
• enterprise_linux = 9.0
• enterprise_linux = 10.0

Remediation

Upgrade past the affected range:

• nginx_plus r36
• update_infrastructure 5.2