CVE-2025-48593 PoC — Google Android 安全漏洞

介绍

# CVE-2025-48593: Zero-Click Remote Code Execution in Android System

**Author:** LAKSHMIKANTHAN K (letchupkt)  
**Date:** November 2025  
**Severity:** Critical

> A critical zero-click remote code execution vulnerability affecting Android 13-16 devices.

## Vulnerability Overview

| Attribute | Details |
|-----------|---------|
| CVE ID | CVE-2025-48593 |
| Severity | Critical (Remote Code Execution, Zero-Click) |
| CVSS Score | 9.8 (Estimated, pending NVD confirmation) |
| Attack Vector | Network (Remote) |
| User Interaction | None Required |
| Privileges Required | None |
| Exploit Status | No public PoC available (as of Nov 4, 2025) |

## Affected Versions

The following Android versions are vulnerable if not patched:

- **Android 13**: All builds from October 2023 to October 2025
- **Android 14**: All builds from October 2023 to October 2025
- **Android 15**: All builds up to October 2025
- **Android 16**: Builds from July 2025 to October 2025

**Warning:** Unpatched devices remain fully exposed to this vulnerability.

## Technical Details

### Root Cause

The vulnerability exists due to improper input validation in the Android System component. This flaw allows remote attackers to overflow buffers and inject executable code without any user interaction.

### Vulnerable Code Pattern

```c
// Simplified pseudocode showing the vulnerability
void process_system_packet(Packet *p) {
    if (p->type == MALICIOUS_TYPE) {
        // Missing bounds check allows buffer overflow
        memcpy(kernel_buffer, p->payload, p->size);  // CVE-2025-48593
        execute_payload(); // Remote code execution achieved
    }
}
```

The lack of bounds checking on the `memcpy()` operation allows an attacker to write beyond the allocated buffer, leading to arbitrary code execution in kernel context.

## Mitigation and Remediation

### Check Your Patch Level

```bash
# Verify your device's security patch level
adb shell getprop ro.build.version.security_patch
# Expected output: 2025-11-01 or 2025-11-05
```

### For End Users

1. **Install Security Updates Immediately**
   - Navigate to: Settings → System → System Update
   - Install the November 2025 security patch

2. **Enable Google Play Protect**
   - Open Google Play Store
   - Go to: Play Protect → Scan

3. **Network Security Precautions**
   - Avoid untrusted Wi-Fi networks
   - Disable Wi-Fi and Bluetooth when not in use, especially in public spaces

### For Enterprise and OEMs

- Deploy the 2025-11-05 security patch from AOSP immediately
- Monitor the official Android Security Bulletin: [November 2025](https://source.android.com/docs/security/bulletin/2025-11-01)
- Implement network-level protections to filter malicious packets
- Conduct security audits on affected devices

## Related Vulnerabilities

Other CVEs disclosed in the same security bulletin:

| CVE ID | Severity | Type | Affected Versions |
|--------|----------|------|-------------------|
| CVE-2025-48581 | High | Elevation of Privilege | Android 16 only |

## References and Resources

- **NVD Entry**: [nvd.nist.gov/vuln/detail/CVE-2025-48593](https://nvd.nist.gov/vuln/detail/CVE-2025-48593)
- **Android Security Bulletin**: [source.android.com/security/bulletin](https://source.android.com/docs/security/bulletin/2025-11-01)
- **AOSP Patch**: Search for `CVE-2025-48593` in [Android Git](https://android.googlesource.com)

## Attack Flow Visualization

### Exploitation Sequence

```mermaid
%%{init: {'theme': 'base', 'themeVariables': {'fontSize': '13px', 'fontFamily': 'Arial', 'primaryColor': '#d32f2f', 'primaryTextColor': '#fff', 'primaryBorderColor': '#b71c1c', 'lineColor': '#ef5350', 'secondaryColor': '#1976d2', 'secondaryTextColor': '#fff', 'tertiaryColor': '#388e3c', 'tertiaryTextColor': '#fff'}}}%%
sequenceDiagram
    participant A as 🎯 Attacker
    participant N as 🌐 Network
    participant D as 📱 Device
    participant S as ⚙️ System
    participant K as 🔒 Kernel

    A->>N: 1. Send malicious packet
    Note over N: Wi-Fi/Bluetooth/Cellular
    N->>D: 2. Packet delivered
    Note over D: ⚠️ Zero user interaction
    D->>S: 3. process_system_packet()
    Note over S: ❌ Missing validation
    S->>S: 4. memcpy() overflow
    S->>K: 5. Overwrite kernel memory
    K->>K: 6. Execute shellcode
    Note over K: 🚨 Full compromise
    K-->>A: 7. Establish reverse shell
    A->>K: 8. Execute commands
```

## Attack Chain Analysis

```mermaid
%%{init: {'theme': 'base', 'themeVariables': {'fontSize': '12px', 'primaryColor': '#c62828', 'primaryTextColor': '#fff'}}}%%
graph LR
    A["1️⃣ Packet<br/>Crafting"] --> B["2️⃣ Network<br/>Transmission"]
    B --> C["3️⃣ Device<br/>Reception"]
    C --> D["4️⃣ System<br/>Processing"]
    D --> E["5️⃣ Buffer<br/>Overflow"]
    E --> F["6️⃣ Kernel<br/>Execution"]
    F --> G["7️⃣ Full<br/>Compromise"]
    
    style A fill:#ff5252,stroke:#d32f2f,color:#fff
    style B fill:#ff6e40,stroke:#e64a19,color:#fff
    style C fill:#ffb74d,stroke:#f57c00,color:#fff
    style D fill:#ffa726,stroke:#f57f00,color:#fff
    style E fill:#ffca28,stroke:#fbc02d,color:#333
    style F fill:#ff7043,stroke:#e64a19,color:#fff
    style G fill:#c62828,stroke:#b71c1c,color:#fff
```

## Defense Strategy

### Defense-in-Depth Framework

```mermaid
%%{init: {'theme': 'base', 'themeVariables': {'fontSize': '11px'}}}}%%
graph TD
    Start["🛡️ CVE-2025-48593<br/>Defense Strategy"] 
    
    subgraph Prevention["Prevention Layer"]
        P1["✅ Security Patch<br/>November 2025"]
        P2["🔌 Disable Unused<br/>Interfaces"]
        P3["🛡️ Enable Play<br/>Protect"]
    end
    
    subgraph Detection["Detection Layer"]
        D1["📊 Monitor<br/>Network Traffic"]
        D2["📝 Track System<br/>Logs"]
        D3["🔍 Deploy EDR/MDM"]
    end
    
    subgraph Response["Response Layer"]
        R1["🚨 Isolate<br/>Devices"]
        R2["⚡ Force Update"]
        R3["🔬 Analyze<br/>Forensics"]
    end
    
    Start --> Prevention
    Prevention --> Detection
    Detection --> Response
    
    P1 --> D1
    P2 --> D2
    P3 --> D3
    
    D1 --> R1
    D2 --> R2
    D3 --> R3
    
    style Start fill:#1565c0,stroke:#0d47a1,color:#fff
    style P1 fill:#00897b,stroke:#004d40,color:#fff
    style P2 fill:#00897b,stroke:#004d40,color:#fff
    style P3 fill:#00897b,stroke:#004d40,color:#fff
    style D1 fill:#f57f17,stroke:#e65100,color:#fff
    style D2 fill:#f57f17,stroke:#e65100,color:#fff
    style D3 fill:#f57f17,stroke:#e65100,color:#fff
    style R1 fill:#d32f2f,stroke:#b71c1c,color:#fff
    style R2 fill:#d32f2f,stroke:#b71c1c,color:#fff
    style R3 fill:#d32f2f,stroke:#b71c1c,color:#fff
```

## Patch Deployment Process

### Security Update Distribution

```mermaid
%%{init: {'theme': 'base', 'themeVariables': {'fontSize': '11px'}}}}%%
graph TD
    Start["📋 Google Security<br/>Team"] --> A["🔧 Develop &<br/>Test Patch"]
    A --> B["📤 Release to AOSP<br/>Nov 1-5, 2025"]
    
    B --> C{"Distribution<br/>Channels"}
    
    C -->|Direct Push| D1["Pixel<br/>Devices"]
    C -->|OEM Update| D2["Samsung"]
    C -->|OEM Update| D3["OnePlus"]
    C -->|OEM Update| D4["Others"]
    
    D1 --> E1["⚡ Week 1<br/>OTA"]
    D2 --> E2["📅 Week 2-4<br/>Monthly"]
    D3 --> E3["📅 Week 2-4<br/>Monthly"]
    D4 --> E4["📅 Week 2-6<br/>Monthly"]
    
    E1 --> F["👤 End User<br/>Installation"]
    E2 --> F
    E3 --> F
    E4 --> F
    
    F --> G{"✔️ Success?"}
    
    G -->|Yes| H["✅ Patch Level<br/>2025-11-01+"]
    G -->|No| I["🔄 Retry/<br/>Manual Update"]
    
    H --> J["🔐 Device<br/>Protected"]
    I --> F
    
    J --> K["✨ Vulnerability<br/>Mitigated"]
    
    style Start fill:#1976d2,stroke:#0d47a1,color:#fff
    style A fill:#1976d2,stroke:#0d47a1,color:#fff
    style B fill:#0288d1,stroke:#01579b,color:#fff
    style C fill:#424242,stroke:#212121,color:#fff
    style D1 fill:#0097a7,stroke:#006064,color:#fff
    style D2 fill:#0097a7,stroke:#006064,color:#fff
    style D3 fill:#0097a7,stroke:#006064,color:#fff
    style D4 fill:#0097a7,stroke:#006064,color:#fff
    style E1 fill:#00acc1,stroke:#00838f,color:#fff
    style E2 fill:#00acc1,stroke:#00838f,color:#fff
    style E3 fill:#00acc1,stroke:#00838f,color:#fff
    style E4 fill:#00acc1,stroke:#00838f,color:#fff
    style F fill:#26c6da,stroke:#00acc1,color:#000
    style G fill:#616161,stroke:#424242,color:#fff
    style H fill:#00897b,stroke:#00695c,color:#fff
    style I fill:#d32f2f,stroke:#b71c1c,color:#fff
    style J fill:#388e3c,stroke:#1b5e20,color:#fff
    style K fill:#1b5e20,stroke:#0d3817,color:#fff
```

## Summary

**Key Takeaway:** Unpatched devices remain exposed to zero-click remote code execution. Install the November 2025 security patch immediately.

---

**Document Information:**
- **Author:** LAKSHMIKANTHAN K (letchupkt)
- **Version:** 1.0

For AOSP patch details, search `CVE-2025-48593` in the Android Git repository.

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