HTTP Response Splitting in Apache Juneau

Executive Summary

This is an HTTP Response Splitting vulnerability in Apache Juneau where response header values or redirect targets are passed to the servlet container without proper sanitization. If an application uses request data to set these values, a remote attacker could inject CR/LF characters to manipulate HTTP headers or redirect users to malicious sites.

Useful 0 Not Useful 0

Detection Guidance

To detect this vulnerability, inspect Apache Juneau applications for improper handling of HTTP headers or redirects built from user input. Check if applications use sendRedirect() with untrusted data. Review server logs for unusual header values or redirects. No specific commands are provided in the context.

Useful 0 Not Useful 0

Impact Analysis

An attacker could exploit this to inject malicious headers, perform phishing attacks via crafted redirects, or manipulate responses to deceive users or bypass security controls. The impact depends on how the vulnerable application processes user input.

Useful 0 Not Useful 0

Compliance Impact

This vulnerability could potentially impact compliance with GDPR and HIPAA by enabling HTTP Response Splitting attacks. Such attacks may lead to unauthorized data exposure, session hijacking, or phishing attacks, which could violate data protection requirements under GDPR (e.g., Article 32 on security of processing) and HIPAA (e.g., safeguards for protected health information).

Useful 0 Not Useful 0

Mitigation Strategies

Upgrade Apache Juneau to version 9.2.1 or later. Ensure header values are sanitized by default and applications using request data for redirects switch from sendRedirect() to sendSafeRedirect().

Useful 0 Not Useful 0