HTTP2: Apache Tomcat HTTP2 Denial of Service
This signature detects attempts to exploit a known vulnerability against Apache Tomcat. A successful attack can result in a denial-of-service condition.
Extended Description
The HTTP/2 implementation in Apache Tomcat 9.0.0.M1 to 9.0.14 and 8.5.0 to 8.5.37 accepted streams with excessive numbers of SETTINGS frames and also permitted clients to keep streams open without reading/writing request/response data. By keeping streams open for requests that utilised the Servlet API's blocking I/O, clients were able to cause server-side threads to block eventually leading to thread exhaustion and a DoS.
Affected Products
Apache tomcat
References
CVE: CVE-2019-0199
URL: https://tomcat.apache.org/security-8.html#fixed_in_apache_tomcat_8.5.38
Short Name
HTTP2:APACHE-CVE-2019-0199-DOS
Severity
Minor
Recommended
True
Recommended Action
Drop
Category
HTTP2
Keywords
Apache CVE-2019-0199 Denial HTTP2 Service Tomcat of
Release Date
06/04/2019
Supported Platforms
srx-branch-19.3
vsrx3bsd-19.2
srx-19.4
vsrx3bsd-19.4
srx-branch-19.4
vsrx-19.4
vsrx-19.2
srx-19.3
Sigpack Version
3552
False Positive
Unknown
Vendors
Apache
CVSS Score
5.0