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Apache Tomcat DoS Vulnerability - June19 (Linux)
Information
Severity
Severity
Medium
Family
Family
Web application abuses
CVSSv2 Base
CVSSv2 Base
5.0
CVSSv2 Vector
CVSSv2 Vector
AV:N/AC:L/Au:N/C:N/I:N/A:P
Solution Type
Solution Type
Vendor Patch
Created
Created
4 years ago
Modified
Modified
4 years ago
Summary
Apache Tomcat is prone to a denial of service vulnerability.
Insight
Insight
The fix for CVE-2019-0199 was incomplete and did not address HTTP/2 connection window exhaustion on write. By not sending WINDOW_UPDATE messages for the connection window (stream 0) clients are able to cause server-side threads to block eventually leading to thread exhaustion and a DoS.
Affected Software
Affected Software
Apache Tomcat versions 8.5.0 to 8.5.40 and 9.0.0.M1 to 9.0.19.
Detection Method
Detection Method
Checks if a vulnerable version is present on the target host.
Solution
Solution
Update to version 8.5.41, 9.0.20 or later.