# TASK_120: S607 Process Security Resolution - System Command Hardening
**Created By**: Quality_Guardian (Hook Feedback Analysis) | **Priority**: HIGH | **Duration**: 2 hours
**Technique Focus**: Security Hardening + Defensive Programming + Process Execution Safety
**Size Constraint**: Target <250 lines/module, Max 400 if splitting awkward
## 🚦 Status & Assignment
**Status**: COMPLETED ✅
**Assigned**: Quality_Guardian
**Dependencies**: TASK_119 COMPLETED (Critical infrastructure fixed)
**Blocking**: None - Security enhancement for production hardening
## 📖 Required Reading (Complete before starting)
- [x] **TODO.md Status**: ✅ COMPLETED - Task assigned to Quality_Guardian
- [x] **Hook Feedback**: ✅ COMPLETED - S607 violations in src/commands/application.py (6+ instances)
- [x] **Security Context**: ✅ COMPLETED - Process execution with partial executable paths creates security risks
- [x] **Current Suppressions**: ✅ COMPLETED - Violations resolved with secure subprocess wrapper
## 🎯 Problem Analysis
**Classification**: Security/Process Execution Safety
**Location**: src/commands/application.py lines 452, 466, 497, 503, 518, 522
**Impact**: Process execution security - partial paths could lead to command injection
<thinking>
S607 Analysis - Starting a process with partial executable path:
Current Issues:
1. `pgrep` - Line 452: subprocess.run(['pgrep', ...])
2. `tasklist` - Line 466: subprocess.run(['tasklist', ...])
3. Multiple other subprocess calls with partial paths
Security Risks:
- PATH injection attacks if malicious directories are in PATH
- Command substitution attacks
- Privilege escalation through process hijacking
Solutions:
1. Use full absolute paths to system binaries
2. Implement path validation and sanitization
3. Use shutil.which() to resolve safe executable paths
4. Add comprehensive input validation for process arguments
5. Implement secure subprocess execution wrapper
Best Practice: Create secure process execution utility with:
- Full path resolution
- Input sanitization
- Error handling
- Logging for security audit
</thinking>
## ✅ Resolution Subtasks (Sequential completion)
### Phase 1: Security Analysis & Design
- [x] **Agent Assignment**: ✅ COMPLETED - Quality_Guardian continues (perfect security domain match)
- [x] **TODO.md Assignment**: ✅ COMPLETED - TASK_120 assigned to Quality_Guardian
- [x] **Vulnerability Assessment**: ✅ COMPLETED - All S607 violations in application.py analyzed
- [x] **Security Solution Design**: ✅ COMPLETED - Secure process execution wrapper designed
- [x] **Path Resolution Strategy**: ✅ COMPLETED - Safe executable path resolution implemented
### Phase 2: Secure Implementation
- [x] **Secure Process Wrapper**: ✅ COMPLETED - secure_subprocess_run utility implemented
- [x] **Path Validation**: ✅ COMPLETED - Full path resolution with trusted location validation
- [x] **Input Sanitization**: ✅ COMPLETED - Comprehensive argument sanitization added
- [x] **Error Handling**: ✅ COMPLETED - Secure error handling with SecurityError exception
- [x] **S607 Violations**: ✅ COMPLETED - All 6+ process security violations fixed
### Phase 3: Security Validation & Testing
- [x] **Security Testing**: ✅ COMPLETED - No command injection vulnerabilities confirmed
- [x] **Path Resolution Test**: ✅ COMPLETED - Secure executable path resolution confirmed
- [x] **Regression Check**: ✅ COMPLETED - Application functionality preserved
- [x] **Linter Validation**: ✅ COMPLETED - All S607 violations resolved (ruff check passed)
### Phase 4: Quality Gate & Completion
- [x] **Security Audit**: ✅ COMPLETED - Process execution security validated
- [x] **TASK_120.md Completion**: ✅ COMPLETED - All subtasks marked complete
- [x] **TODO.md Update**: ✅ COMPLETED - Task status updated with Quality_Guardian
- [x] **Security Documentation**: ✅ COMPLETED - Secure process execution patterns documented
## 🔧 Implementation Files & Specifications
**Primary File**: `src/commands/application.py`
- **S607 Violations**: Lines 452, 466, 497, 503, 518, 522
- **Security Pattern**: Replace `subprocess.run(['command', ...])` with secure wrapper
- **Path Resolution**: Use `shutil.which()` for full path resolution
**Secure Process Execution Wrapper**:
```python
def secure_subprocess_run(command: str, args: list[str], **kwargs) -> subprocess.CompletedProcess:
"""Secure subprocess execution with full path resolution and validation."""
# Resolve full executable path
full_path = shutil.which(command)
if not full_path:
raise SecurityError(f"Executable not found in PATH: {command}")
# Validate path is in trusted locations
if not _is_trusted_executable(full_path):
raise SecurityError(f"Untrusted executable path: {full_path}")
# Sanitize arguments
sanitized_args = [_sanitize_argument(arg) for arg in args]
# Execute with full path
return subprocess.run([full_path] + sanitized_args, **kwargs)
```
## 🏗️ Modularity Strategy
- **Security First**: Prioritize command injection prevention
- **Centralized Security**: Create reusable secure process execution utility
- **Input Validation**: Comprehensive argument sanitization
- **Audit Trail**: Logging for security monitoring
## ✅ Success Criteria
- All S607 violations in application.py resolved
- Secure process execution wrapper implemented
- Full executable path resolution functional
- No command injection vulnerabilities
- Application functionality preserved
- Security audit trail established
- **TODO.md updated with completion status and security metrics**
