Apache Tomcat reserveWindowSize Denial-Of-Service Vulnerability
June 21st, 2019
Vulnerability Details
This vulnerability allows remote attackers to create a denial-of-service condition on vulnerable installations of Apache Tomcat. Authentication is not required to exploit this vulnerability.
The specific flaw exists within the handling of HTTP2 requests. A crafted HTTP2 request can create a deadlock on a worker thread. An attacker can leverage this vulnerability to create a denial-of-service condition on the system.
Additional Details
Apache has issued an update to correct this vulnerability. More details can be found at:
http://tomcat.apache.org/security-9.html
Disclosure Timeline
- 2019-04-26 - Vulnerability reported to vendor
- 2019-06-21 - Coordinated public release of advisory
Credit
John Simpson of Trend Micro Security Research
