What we found

• AppSecAI Vulnerability ID: 69c734eb
• Vulnerability: CWE-89: SQL Injection
• Severity: Medium
• File: src/main/java/org/owasp/benchmark/testcode/BenchmarkTest02177.java:50
• Detected By: OpenGrep
• Detection Rule: Tainted Sql From Http Request

Description: User-controlled input from HTTPServletRequest flows directly into a SQL query via string concatenation with no parameterization or sanitization. An attacker can inject arbitrary SQL commands into the PASSWORD clause of an authentication query, potentially bypassing authentication or accessing unauthorized data.

Why this matters

Risk if not fixed: SQL injection on an authentication query creates a critical attack surface. An attacker could:

• Bypass authentication by injecting SQL logic (e.g., ' OR '1'='1)
• Extract sensitive user data from the USERS table
• Modify or delete database records
• Execute administrative database operations
• In some database configurations, execute operating system commands

Risk level: Direct database access with no input validation layer

Why we're changing it

The vulnerability stems from a deterministic data flow:

1. Line 43: param = request.getParameter("BenchmarkTest02177") — attacker-controlled HTTP parameter
2. Lines 89-90: guess = "ABC"; switchTarget = guess.charAt(2) — evaluates to 'C' at compile time
3. Lines 100-103: case 'C': bar = param — user input assigned to bar unconditionally
4. Line 48: sql = "SELECT * from USERS where USERNAME='foo' and PASSWORD='" + bar + "'" — raw string concatenation with no escaping
5. Lines 50-52: JDBCtemplate.query(sql, ...) — unparameterized SQL executed against the database

The switch statement's compile-time constant ensures bar always receives the raw HTTP parameter value, which is then concatenated directly into the SQL string. No ESAPI encoding, PreparedStatement, or bind variable usage protects the query construction.

How we confirmed

Vulnerability Flow Diagram

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flowchart TD
    A["HTTPServletRequest.getParameter<br/>BenchmarkTest02177"] -->|attacker input| B["param variable"]
    B -->|switchTarget='C'<br/>case 'C': bar=param| C["bar variable<br/>unvalidated"]
    C -->|string concatenation| D["SQL: SELECT * FROM USERS<br/>WHERE PASSWORD='" + bar + "'"]
    D -->|JDBCtemplate.query<br/>unparameterized| E["❌ SQL Injection<br/>Attacker can modify query logic"]
    
    style A fill:#EDE9FE,stroke:#7C3AED
    style B fill:#EDE9FE,stroke:#7C3AED
    style C fill:#FFE5E5,stroke:#F65A5A
    style D fill:#FFE5E5,stroke:#F65A5A
    style E fill:#FEF3C7,stroke:#F59E0B

Manual Verification Steps

1. Locate the vulnerable code in src/main/java/org/owasp/benchmark/testcode/BenchmarkTest02177.java at line 48-52
2. Confirm the SQL query string contains a ? placeholder instead of string concatenation
3. Verify that JDBCtemplate.query() uses a PreparedStatementSetter to bind the bar variable via ps.setString(1, bar)
4. Confirm no raw string concatenation with user input remains in the SQL construction
5. Run the test suite to ensure no functionality regression

#!/bin/bash
# Verification script for CWE-89 fix in BenchmarkTest02177.java
set -e

echo "=== Verification: SQL Injection Fix ==="

# Step 1: Check that the SQL query uses a placeholder
echo "Step 1: Verifying SQL query uses parameterized placeholder..."
if grep -q "SELECT \* from USERS where USERNAME='foo' and PASSWORD=?" src/main/java/org/owasp/benchmark/testcode/BenchmarkTest02177.java; then
    echo "✓ SQL query contains '?' placeholder"
else
    echo "✗ SQL query does not use parameterized placeholder"
    exit 1
fi

# Step 2: Check that PreparedStatementSetter is used
echo "Step 2: Verifying PreparedStatementSetter is used for binding..."
if grep -q "PreparedStatementSetter" src/main/java/org/owasp/benchmark/testcode/BenchmarkTest02177.java; then
    echo "✓ PreparedStatementSetter found"
else
    echo "✗ PreparedStatementSetter not found"
    exit 1
fi

# Step 3: Check that ps.setString is used to bind the parameter
echo "Step 3: Verifying ps.setString() is used for parameter binding..."
if grep -q "ps.setString(1, bar)" src/main/java/org/owasp/benchmark/testcode/BenchmarkTest02177.java; then
    echo "✓ Parameter binding with ps.setString() found"
else
    echo "✗ Parameter binding not found"
    exit 1
fi

# Step 4: Verify no string concatenation with bar in SQL
echo "Step 4: Verifying no string concatenation with user input in SQL..."
if grep -q "PASSWORD='\" + bar + "'" src/main/java/org/owasp/benchmark/testcode/BenchmarkTest02177.java; then
    echo "✗ Vulnerable string concatenation still present"
    exit 1
else
    echo "✓ No vulnerable string concatenation found"
fi

echo ""
echo "=== All verification checks passed ==="

Vulnerable flow: src/main/java/org/owasp/benchmark/testcode/BenchmarkTest02177.java:50

SQL Injection

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flowchart TD
    subgraph Vulnerable["❌ Vulnerable Flow"]
        direction LR
        A1["Project"] --> A2["SQL string concatenation with user input"]
        A2 --> A3["💥 Database Compromised"]
    end

    Vulnerable ~~~ Fixed

    subgraph Fixed["✅ Fixed Flow"]
        direction LR
        B1["Project"] --> B2["The fix is in place"]
        B3["🛡️ Attack Blocked"]
        B2 --> B3
    end

    style A2 fill:#FFE5E5,color:#000
    style A3 fill:#ffa94d,color:#000
    style B2 fill:#74c0fc,color:#000
    style B3 fill:#DCFCE7,color:#000

How we fixed it

Fix Description

Root cause: User-controlled input from HTTPServletRequest flows through the doSomething() method into the bar variable (the switch statement's compile-time constant switchTarget evaluates to 'C', assigning param directly to bar). This attacker-controlled value was previously passed into a SQL query via string concatenation, allowing arbitrary SQL to be injected into the PASSWORD clause.

Fix approach: The fix replaces string concatenation with Spring JdbcTemplate's parameterized query mechanism. The SQL string now contains a ? placeholder, and an explicit PreparedStatementSetter binds the bar variable via ps.setString(1, bar). The JDBC driver treats the bound value strictly as data, never as executable SQL syntax, completely eliminating the injection vector regardless of input content. PreparedStatementSetter makes the parameterization unambiguous to both static analysis tools and human reviewers.

Alternatives considered:

• Object[] varargs binding (JDBCtemplate.query(sql, new Object[]{bar}, rowMapper)) — functionally correct but deprecated in Spring 5.3+ and potentially misread by SAST tools as tainted data flowing alongside the SQL string
• Raw PreparedStatement via JDBC connection — functionally equivalent but would require manual connection/statement lifecycle management and diverge significantly from the existing Spring JdbcTemplate idiom used throughout the codebase
• Input sanitization/escaping — rejected because escaping is error-prone and dialect-dependent; parameterized queries are the authoritative defense per CWE-89 guidance

Vulnerabilities Addressed

• Grouped findings in scope: 1
• Findings fixed in this PR: 1
• Primary CWE family: CWE-89
• Files covered: src/main/java/org/owasp/benchmark/testcode/BenchmarkTest02177.java

How we validated it

The fix was validated by:

1. Confirming the SQL query string uses a ? placeholder instead of string concatenation
2. Verifying that PreparedStatementSetter explicitly binds the user input as a data parameter
3. Running the test suite to ensure no functionality regression
4. Confirming that static analysis tools no longer flag the query construction as vulnerable

How to verify

Reviewers can verify the fix by:

1. Examining lines 48-52 in BenchmarkTest02177.java to confirm the parameterized query structure
2. Running the verification script above to automatically check all fix requirements
3. Executing the test suite: mvn test -Dtest=BenchmarkTest02177
4. Confirming that SAST tools no longer report SQL injection on this code path

Before you merge

• Fix addresses the root cause (parameterized query replaces string concatenation)
• No new security vulnerabilities introduced
• Code follows project conventions (Spring JdbcTemplate idiom)
• Edge cases handled (null input, empty strings, special characters all treated as data)
• No functionality regression (authentication query behavior unchanged)
• All SQL queries in this file use parameterized statements
• Static analysis tools confirm vulnerability is resolved

Learn more

• CWE-89: SQL Injection
• OWASP SQL Injection Prevention Cheat Sheet
• OWASP SQL Injection Attack Description
• Spring JdbcTemplate Documentation

This fix was generated by AppSecAI. Please review before merging.