CVE-2019-18838: Null Pointer Dereference
An issue was discovered in Envoy 1.12.0. Upon receipt of a malformed HTTP request without a Host header, it sends an internally generated "Invalid request" response. This internally generated response is dispatched through the configured encoder filter chain before being sent to the client. An encoder filter that invokes route manager APIs that access a request's Host header causes a NULL pointer dereference, resulting in abnormal termination of the Envoy process.
Other sources
Malformed HTTP request without the Host header may cause abnormal termination of the Envoy process
— Red Hat
Affected Software
Remediation
Patch Available
Event History
Frequently Asked Questions
What is CVE-2019-18838?
CVE-2019-18838 is a vulnerability in Envoy, versions up to and including 1.12.0.
What is the severity of CVE-2019-18838?
CVE-2019-18838 has a severity rating of 7.5 (High).
How does CVE-2019-18838 affect Envoy?
CVE-2019-18838 affects Envoy versions up to and including 1.12.1.
How can I fix CVE-2019-18838?
To fix CVE-2019-18838, update your Envoy installation to version 1.12.1 or later.
Is there any additional information about CVE-2019-18838?
For more information about CVE-2019-18838, you can refer to the following resources: - Envoy blog: https://blog.envoyproxy.io - Envoy GitHub repository: https://github.com/envoyproxy/envoy/commits/master - Envoy security advisories: https://github.com/envoyproxy/envoy/security/advisories/GHSA-f2rv-4w6x-rwhc