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Title: Medium severity CWE-79 vulnerability in src/main/java/org/owasp/benchmark/testcode/BenchmarkTest01598.java:51 (1 additional file changed) by appsecai-inte-tool[bot] · Pull Request #342 · AppSecureAI/BenchmarkJava100-public · GitHub

Open Graph Title: Medium severity CWE-79 vulnerability in src/main/java/org/owasp/benchmark/testcode/BenchmarkTest01598.java:51 (1 additional file changed) by appsecai-inte-tool[bot] · Pull Request #342 · AppSecureAI/BenchmarkJava100-public

X Title: Medium severity CWE-79 vulnerability in src/main/java/org/owasp/benchmark/testcode/BenchmarkTest01598.java:51 (1 additional file changed) by appsecai-inte-tool[bot] · Pull Request #342 · AppSecureAI/BenchmarkJava100-public

Description: Vulnerability Information AppSecAI Vulnerability ID: 6914fa3a28b9e848644fceb8 Vulnerability: Cross-Site Scripting CWE Classification: CWE-79 Severity: Medium File: src/main/java/org/owasp/benchmark/testcode/BenchmarkTest01598.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 input from request.getParameterValues() flows through multiple transformations (StringBuilder operations, Base64 encode/decode, string splitting) but never undergoes HTML encoding. The value is written directly to response.getWriter() with Content-Type text/html. Base64 encoding is data transformation, not XSS sanitization. Line 52 explicitly disables browser XSS protection with X-XSS-Protection: 0. No context-appropriate encoding exists anywhere in the data flow from source (line 47) to sink (line 56). Recommended Remediation Apply HTML context encoding before writing to the response. Replace line 56 with: response.getWriter().write(Encode.forHtml(bar)); using OWASP Java Encoder library. Alternatively, use a templating engine with automatic escaping (JSP with JSTL's , Thymeleaf, etc.) instead of writing directly to the Writer. Remove the X-XSS-Protection: 0 header that 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. BenchmarkTest01598.java (src/main/java/org/owasp/benchmark/testcode/BenchmarkTest01598.java) Added import: org.apache.commons.text.StringEscapeUtils (line 26) Fixed vulnerable line: Changed line 52 from: response.getWriter().write(bar); to: response.getWriter().write(StringEscapeUtils.escapeHtml4(bar)); 2. pom.xml Added dependency: Apache Commons Text 1.12.0 for HTML escaping functionality Bug Fix Explanation Fix Summary The code wrote user-controlled input directly to the HTTP response without HTML escaping, creating a Cross-Site Scripting (XSS) vulnerability. An attacker could inject malicious JavaScript by providing input like , which would execute in victims' browsers. Fixed by applying HTML entity encoding using StringEscapeUtils.escapeHtml4() before writing to the response. This converts dangerous characters (<, >, &, ", ') into their HTML entity equivalents (<, >, &, ", '), ensuring they render as text rather than executable code. This approach is secure because: Context-appropriate encoding: Uses HTML entity encoding specifically designed for HTML context Comprehensive protection: Escapes all characters with special meaning in HTML Industry-standard library: Apache Commons Text is a well-vetted, maintained security library Defense-in-depth: Works alongside other XSS protections (Content Security Policy, HTTP-only cookies) Minimal attack surface: Pure data transformation with no parsing or evaluation The fix maintains complete backward compatibility—legitimate content displays identically, while malicious payloads are neutralized. Migration Guidance Not applicable. This fix requires no manual steps: Maven automatically resolves the Apache Commons Text dependency during build The HTML escaping is transparent to application behavior No configuration changes, data migration, or API modifications required Deployment follows standard procedures (build and deploy the updated WAR file) Changes Made: Updated source code with secure implementation Updated 1 additional file (dependencies, configurations, etc.) This PR was generated automatically to address a security vulnerability. Please review the changes carefully before merging.

Open Graph Description: Vulnerability Information AppSecAI Vulnerability ID: 6914fa3a28b9e848644fceb8 Vulnerability: Cross-Site Scripting CWE Classification: CWE-79 Severity: Medium File: src/main/java/org/owasp/benchmark...

X Description: Vulnerability Information AppSecAI Vulnerability ID: 6914fa3a28b9e848644fceb8 Vulnerability: Cross-Site Scripting CWE Classification: CWE-79 Severity: Medium File: src/main/java/org/owasp/benchmark...

Opengraph URL: https://github.com/AppSecureAI/BenchmarkJava100-public/pull/342

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