Medium severity CWE-79 vulnerability in src/main/java/org/owasp/benchmark/testcode/BenchmarkTest01268.java:52 (1 additional file changed)

[appsecai-inte-tool]

Vulnerability Information

AppSecAI Vulnerability ID: 6914fa3928b9e848644fceaf
Vulnerability: Cross-Site Scripting
CWE Classification: CWE-79
Severity: Medium
File: src/main/java/org/owasp/benchmark/testcode/BenchmarkTest01268.java
Detection Rule: java.lang.security.audit.xss.no-direct-response-writer.no-direct-response-writer
Description: Detected a request with potential user-input going into a OutputStream or Writer object. This bypasses any view or template environments, including HTML escaping, which may expose this application to cross-site scripting (XSS) vulnerabilities. Consider using a view technology such as JavaServer Faces (JSFs) which automatically escapes HTML views.

Triage Analysis

Status: Confirmed vulnerability
Security Assessment:

Severity: High

Confidence: 100%

Analysis

User-controlled input from request parameter 'BenchmarkTest01268' flows through string transformations and outputs directly to HTTP response via response.getWriter().write() without HTML encoding. Content-Type is set to text/html, causing browsers to render and execute any embedded scripts. The code explicitly disables XSS protection with response.setHeader('X-XSS-Protection', '0'). An attacker can inject <script>alert('XSS')</script> or other malicious HTML/JavaScript that executes in victim browsers.

Recommended Remediation

Apply context-appropriate output encoding before writing to response. Use OWASP Java Encoder: String safe = Encode.forHtml(bar); response.getWriter().write(safe, 0, safe.length()); Alternatively, use a view technology (JSP/JSF with JSTL) that provides automatic escaping. Remove the X-XSS-Protection: 0 header which disables browser protections.

Remediation Details

Fix Description:

Perfect! The XSS vulnerability has been successfully fixed. Here's a summary of the changes:

Changes Made

1. BenchmarkTest01268.java (src/main/java/org/owasp/benchmark/testcode/BenchmarkTest01268.java:51-53)

• Added import: org.apache.commons.text.StringEscapeUtils
• Modified the output logic to HTML-escape user-controlled content before writing to the response:
  • Before: response.getWriter().write(bar, 0, length);
  • After:

    String escapedBar = StringEscapeUtils.escapeHtml4(bar);
    int length = escapedBar.length();
    response.getWriter().write(escapedBar, 0, length);

2. pom.xml (dependency addition)

• Added Apache Commons Text 1.13.0 dependency (latest version) to provide the HTML escaping functionality

Bug Fix Explanation

Fix Summary:

The code wrote user-controlled input directly to the HTTP response without HTML encoding, creating a Cross-Site Scripting (XSS) vulnerability. An attacker could inject malicious JavaScript by providing crafted input through the BenchmarkTest01268 request parameter, which would execute in the victim's browser.

The fix applies HTML entity encoding using StringEscapeUtils.escapeHtml4() before writing the content to the response. This converts dangerous HTML characters (<, >, &, ", ') into their HTML entity equivalents (<, >, &, ", '), ensuring that any injected script tags or HTML are rendered as plain text rather than executed. The approach is secure because it neutralizes all XSS attack vectors while preserving the application's display functionality, and it's maintainable as a standard industry practice supported by a well-tested Apache Commons library.

Migration Guidance:

No migration steps required. This fix is backward compatible and requires no configuration changes. The Apache Commons Text dependency will be automatically downloaded during the next Maven build (mvn clean install). The fix processes all output consistently and transparently without affecting the application's functional behavior or API contracts.

Changes Made:

• Updated source code with secure implementation
• Updated 1 additional file (dependencies, configurations, etc.)

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This PR was generated automatically to address a security vulnerability.
Please review the changes carefully before merging.

[kevinfealey]

Closing this PR as part of repository cleanup.