CVE-2020-17527 : Vulnerability Insights and Analysis

Apache Tomcat: Request header mix-up between HTTP/2 streams

Understanding CVE-2020-17527

This CVE involves a vulnerability in Apache Tomcat that could allow the re-use of an HTTP request header value from a previous stream on an HTTP/2 connection, potentially leading to information leakage between requests.

What is CVE-2020-17527?

Apache Tomcat versions 10.0.0-M1 to 10.0.0-M9, 9.0.0-M1 to 9.0.39, and 8.5.0 to 8.5.59 are affected.
The vulnerability could result in the reuse of HTTP request header values, potentially leaking information between requests.

The Impact of CVE-2020-17527

The vulnerability could lead to errors and the closure of HTTP/2 connections.
Information leakage between requests is possible, posing a risk to data confidentiality.

Technical Details of CVE-2020-17527

This section provides more in-depth technical information about the CVE.

Vulnerability Description

The vulnerability allows the reuse of HTTP request header values from previous streams on an HTTP/2 connection.
This could potentially lead to information leakage between requests.

Affected Systems and Versions

Apache Tomcat 10.0.0-M1 to 10.0.0-M9
Apache Tomcat 9.0.0-M1 to 9.0.39
Apache Tomcat 8.5.0 to 8.5.59

Exploitation Mechanism

Attackers could exploit this vulnerability to access sensitive information by reusing HTTP request header values.

Mitigation and Prevention

Protecting systems from CVE-2020-17527 requires immediate action and long-term security practices.

Immediate Steps to Take

Update Apache Tomcat to the latest patched version.
Monitor network traffic for any unusual activity that could indicate exploitation.

Long-Term Security Practices

Regularly update and patch software to address known vulnerabilities.
Implement network segmentation to limit the impact of potential attacks.

Patching and Updates

Stay informed about security advisories and updates from Apache Software Foundation.
Apply patches promptly to mitigate the risk of exploitation.