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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.

Common Vulnerabilities and Exposures (CVE)