CVE-2020-1935 : What You Need to Know

Apache Tomcat versions 7.0.0 to 9.0.30 had a vulnerability in HTTP header parsing, potentially allowing HTTP Request Smuggling.

Understanding CVE-2020-1935

Apache Tomcat versions 7.0.0 to 9.0.30 are affected by a potential HTTP Request Smuggling vulnerability due to improper handling of invalid HTTP headers.

What is CVE-2020-1935?

CVE-2020-1935 is a vulnerability in Apache Tomcat versions 7.0.0 to 9.0.30 that could lead to HTTP Request Smuggling if the server is behind a misconfigured reverse proxy.

The Impact of CVE-2020-1935

The vulnerability in Apache Tomcat's HTTP header parsing could be exploited to perform HTTP Request Smuggling attacks, potentially compromising the security and integrity of web servers.

Technical Details of CVE-2020-1935

Apache Tomcat 7.0.0 to 9.0.30 vulnerability details.

Vulnerability Description

The HTTP header parsing in affected versions allowed invalid HTTP headers to be treated as valid, creating a potential security loophole.

Affected Systems and Versions

Apache Tomcat versions 7.0.0 to 9.0.30 are impacted by this vulnerability.

Exploitation Mechanism

A reverse proxy mishandling the invalid Transfer-Encoding header could lead to successful HTTP Request Smuggling attacks.

Mitigation and Prevention

Steps to address and prevent CVE-2020-1935.

Immediate Steps to Take

Update Apache Tomcat to a patched version that addresses the HTTP header parsing issue.
Configure reverse proxies correctly to avoid mishandling of Transfer-Encoding headers.

Long-Term Security Practices

Conduct regular security assessments and audits to detect vulnerabilities early.
Stay informed about security advisories and updates from Apache and other relevant sources.

Patching and Updates

Apply patches and updates provided by Apache and other relevant vendors to mitigate the CVE-2020-1935 vulnerability.