Apache Tomcat Native Connector CVE-2018-8019 Remote Security Vulnerability
When using an OCSP responder Apache Tomcat Native 1.2.0 to 1.2.16 and 1.1.23 to 1.1.34 did not correctly handle invalid responses. This allowed for revoked client certificates to be incorrectly identified. It was therefore possible for users to authenticate with revoked certificates when using mutual TLS. Users not using OCSP checks are not affected by this vulnerability.
A vulnerability in the Online Certificate Status Protocol (OCSP) responder of Apache Tomcat Native could allow an authenticated, remote attacker to gain unauthorized access to a targeted system. The vulnerability exists because the affected software improperly handles invalid responses. As a result, revoked certificates may not be properly identified. An attacker could exploit this vulnerability by using a revoked certificate to authenticate to the affected application when using a mutual Transport Layer Security (TLS) connection. A successful exploit could allow the attacker to gain unauthorized access to the system, which could be used to conduct further attacks. Apache confirmed the vulnerability and released software updates.