Apache Tomcat HTTP/2 Implementation Denial of Service Vulnerability [CVE-2019-0199]
CVE Number – CVE-2019-0199
A vulnerability in Apache Tomcat could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on a targeted system.The vulnerability is due to a resource exhaustion condition in the HTTP/2 implementation of the affected software. An attacker could exploit this vulnerability by keeping streams that use the blocking I/O of the Servlet API open for requests. A successful exploit could result in a DoS condition on the targeted system. Apache has confirmed the vulnerability and released software updates.
Analysis
- To exploit this vulnerability, the attacker must keep a stream open for requests to a targeted system, making exploitation difficult in environments that restrict network access from untrusted sources.
Safeguards
- Administrators are advised to apply the appropriate updates.Administrators are advised to allow only trusted users to have network access.Administrators are advised to run both firewall and antivirus applications to minimize the potential of inbound and outbound threats.Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.Administrators can help protect affected systems from external attacks by using a solid firewall strategy.Administrators are advised to monitor affected systems.
Vendor Announcements
- Apache released a security advisory at the following link: CVE-2019-0199 Apache Tomcat HTTP/2 DoS
Fixed Software
- Apache Software has released software updates at the following links: Tomcat 8.5.38 or later and Tomcat 9.0.16 or later
Duncan is a technology professional with over 20 years experience of working in various IT roles. He has a interest in cyber security, and has a wide range of other skills in radio, electronics and telecommunications.