CVE-2019-0199 Apache Tomcat Denial of Service vulnerability
Attackers can cause thread exhaustion and denial of service in Apache Tomcat by sending excessive HTTP/2 SETTINGS frames and keeping streams open.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2019-0199?
CVE-2019-0199 is a high-severity denial of service vulnerability in Apache Tomcat, published on 10 Apr 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-400
Which versions are affected by CVE-2019-0199?
8 open source packages ship an affected version, including org.apache.tomcat.embed:tomcat-embed-core and org.apache.tomcat:tomcat-coyote. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
org.apache.tomcat.embed:tomcat-embed-core Maven | From 8.0.0 | 8.5.38 |
org.apache.tomcat.embed:tomcat-embed-core Maven | From 8.0.0 | 8.5.38 |
org.apache.tomcat.embed:tomcat-embed-core Maven | From 9.0.0 | 9.0.16 |
org.apache.tomcat.embed:tomcat-embed-core Maven | From 9.0.0 | 9.0.16 |
org.apache.tomcat:tomcat-coyote Maven | From 8.0.0 | 8.5.38 |
org.apache.tomcat:tomcat-coyote Maven | From 8.0.0 | 8.5.38 |
2 more packages
org.apache.tomcat:tomcat-coyote Maven | From 9.0.0 | 9.0.16 |
org.apache.tomcat:tomcat-coyote Maven | From 9.0.0 | 9.0.16 |
Linux distribution packages (2)
tomcat SUSE:Linux Enterprise Module for Web and Scripting 15 | All versions | 9.0.21-3.27.1 |
tomcat openSUSE:Leap 15.0 | All versions | 9.0.21-lp150.2.22.1 |
Products include Apache Tomcat.
How do I fix CVE-2019-0199?
Upgrade org.apache.tomcat.embed:tomcat-embed-core to a fixed version for your release line: 8.5.38 or 9.0.16.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2019-0199 being exploited?
There is no known exploitation of CVE-2019-0199 in the wild and no public exploit code.
Other vulnerabilities in Apache Tomcat
Sources
Also known as DEBIAN-CVE-2019-0199, GHSA-qcxh-w3j9-58qr, SUSE-SU-2019:1825-1, UBUNTU-CVE-2019-0199, openSUSE-SU-2019:1723-1.