In Apache Tomcat 9.0.0.M1 to 9.0.30, 8.5.0 to 8.5.50 and 7.0.0 to 7.0.99 the HTTP header parsing code used an approach to end-of-line parsing that allowed some invalid HTTP headers to be parsed as valid

Overview

In Apache Tomcat 9.0.0.M1 to 9.0.30, 8.5.0 to 8.5.50 and 7.0.0 to 7.0.99 the HTTP header parsing code used an approach to end-of-line parsing that allowed some invalid HTTP headers to be parsed as valid. This led to a possibility of HTTP Request Smuggling if Tomcat was located behind a reverse proxy that incorrectly handled the invalid Transfer-Encoding header in a particular manner. Such a reverse proxy is considered unlikely.

Affected

• tomcat >= 7.0.0, <= 7.0.99
• tomcat >= 8.5.0, <= 8.5.50
• tomcat >= 9.0.0, <= 9.0.30
• tomcat = 9.0.0
• debian_linux = 8.0
• debian_linux = 9.0
• debian_linux = 10.0
• ubuntu_linux = 16.04
• leap = 15.1
• data_availability_services
• oncommand_system_manager >= 3.0.0, <= 3.1.3
• agile_engineering_data_management = 6.2.1.0
• agile_product_lifecycle_management = 9.3.3
• agile_product_lifecycle_management = 9.3.5
• agile_product_lifecycle_management = 9.3.6
• communications_element_manager = 8.1.1
• communications_element_manager = 8.2.0
• communications_element_manager = 8.2.1
• communications_instant_messaging_server = 10.0.1.4.0
• health_sciences_empirica_inspections = 1.0.1.2
• health_sciences_empirica_signal = 7.3.3
• hospitality_guest_access = 4.2.0
• hospitality_guest_access = 4.2.1
• hyperion_infrastructure_technology = 11.1.2.4
• instantis_enterprisetrack >= 17.1, <= 17.3
• mysql_enterprise_monitor >= 4.0.0, <= 4.0.12
• mysql_enterprise_monitor >= 8.0.0, <= 8.0.20
• retail_order_broker = 15.0
• siebel_ui_framework <= 20.5
• transportation_management = 6.3.7
• workload_manager = 12.2.0.1
• workload_manager = 18c
• workload_manager = 19c

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.