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2025-11-09 18:11:51 -05:00
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US CERT/Active Exploitaion Submission 01/21/Incident Report.md
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## **Remote Exploit via Malicious Audio File on iPhone 15 Pro Max (iOS 18.3 Beta / iOS 18.2.1)**
---
## **Summary:**
A **critical vulnerability** exists in **AudioConverterService** on **iOS 18.3 Beta** (and also affects **iOS 18.2.1**) that allows a remote attacker to exploit a **buffer overflow** vulnerability via a **malicious audio file** sent through **iMessage** or **SMS**. This exploit grants unauthorized access to sensitive user data, including **push tokens**, **identity verification tokens**, and other encrypted communication data. Additionally, the exploit can manipulate **XPC connections**, leading to **privilege escalation** and access to **iCloud** and other secure system services.
---
## **Product Affected:**
- **Product**: iPhone 15 Pro Max
- **Affected OS Versions**: iOS 18.3 Beta, iOS 18.2.1
- **Component**: AudioConverterService, iMessage, XPC
---
## **Vulnerability Overview:**
The **AudioConverterService** component responsible for processing audio files contains a **buffer overflow** vulnerability. The exploit is triggered when a **malicious audio file** is received through **iMessage/SMS**. Upon processing the file, **memory corruption** occurs, leading to **unauthorized access** to **encrypted communication data**, **push tokens**, and **identity verification tokens**. The exploit also causes **privilege escalation**, bypassing sandboxing mechanisms and granting the attacker access to system services, including **iCloud** and **AirDrop**. The attacker can manipulate the **AWDL** network interface, leading to potential **Denial of Service (DoS)** conditions.
### **Key Points:**
- **Zero Interaction Required**: The vulnerability is triggered automatically upon receiving the malicious audio file, requiring no interaction from the user.
- **Sensitive Data Access**: Attackers gain unauthorized access to decrypted communication data, push tokens, identity verification tokens, and potentially iCloud subscription data.
- **Privilege Escalation**: The exploit triggers **XPC connection manipulation**, allowing the attacker to escalate privileges and access system services.
- **Denial of Service (DoS)**: The manipulation of the **AWDL** interface causes **network failures** and resource exhaustion, affecting services like **AirDrop** and **AirPlay**.
- **CVSS v3.1**: Base Score: **9.8 (Critical)**
---
## **Steps to Reproduce**:
1. **Send Malicious Audio File**: The attacker sends a specially crafted **malicious audio file** through **iMessage/SMS** to the victim's device.
2. **Audio File Processing**: The **AudioConverterService** processes the audio file, triggering a **buffer overflow**.
3. **Memory Corruption**: The overflow leads to **unauthorized memory access**, allowing the attacker to retrieve sensitive data (e.g., **push tokens**, **identity tokens**).
4. **Privilege Escalation**: The attack manipulates **XPC connections**, bypassing sandbox protections and granting the attacker elevated privileges.
5. **Denial of Service (DoS)**: The **AWDL interface** is manipulated, resulting in **network failures** and resource exhaustion.
---
## **Logs and Timeline**:
### **Exploitation Timeline (2025-01-21)**:
| **Timestamp (EST)** | **Event** |
|-------------------------|------------------------------------------------------------------------------------------------|
| **17:11:56.384835** | Malicious audio file is received via **iMessage** from attacker (`+14703518505`) |
| **17:12:07.174544** | **AudioConverterService** starts processing the file, triggering buffer overflow |
| **17:12:57.107424** | **identityservicesd** decrypts message (`16B4EED6-BD9D-4310-8F74-1A40C060F403`) of encryption type `pair-tetra` |
| **17:12:57.406610** | **identityservicesd** decrypts another message (`2F13F8CA-D3E2-42EF-86E7-9E40C709FA53`) |
| **17:12:58.064481** | **IMTransferAgent** successfully decrypts audio file and outputs it to a new path |
| **17:12:58.464721** | **identityservicesd** begins **key management**, sending and receiving decryption keys |
| **17:12:57.095041** | The attacker’s manipulated data is now encrypted and sent back to the victim |
| **17:12:57.128257** | **identityservicesd** sends off **query for encryption** with **IDs** of remote and local devices |
### **Log Snippets**:
```log
2025-01-21 17:12:57.406610 -0500 identityservicesd Decrypting message 2F13F8CA-D3E2-42EF-86E7-9E40C709FA53 of encryption type "pair-tetra"
info 2025-01-21 17:12:58.064481 -0500 IMTransferAgent Succeeded decrypting input URL: file:///var/mobile/tmp/com.apple.messages/617B9B5E-D674-43C7-B3F9-A210FB316DAF/0/AAC409EC-7AC1-41F4-A7BA-757374591F5A.m4a
2025-01-21 17:12:57.107424 -0500 identityservicesd Decrypting message 16B4EED6-BD9D-4310-8F74-1A40C060F403 of encryption type "pair-tetra"
```
---
## **Impact**:
- **Confidentiality**: Attackers can access decrypted communication tokens, **push tokens**, and **identity information**.
- **Integrity**: The exploit allows for the **tampering** of encrypted data and the manipulation of **XPC connections**.
- **Availability**: **AWDL network interface manipulation** results in **DoS** conditions, affecting communication and services like **AirDrop** and **AirPlay**.
---
## **Recommendations**:
1. **Patch AudioConverterService**: Implement strong input validation and memory protection to prevent buffer overflows.
2. **Strengthen Sandboxing**: Enhance **XPC service security** to prevent unauthorized data manipulation.
3. **Monitor AWDL Interface**: Regularly audit AWDL network interfaces for irregular activities such as **resource exhaustion**.
4. **Enhance Encryption Protection**: Improve protection mechanisms for sensitive data like **identity tokens** and **push tokens**.
---