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How CVE-2025-31246 Works
This vulnerability resides in macOS’s Apple Filing Protocol (AFP) client implementation. When connecting to a malicious AFP server, improper memory handling during file operations triggers kernel memory corruption. Attackers craft malicious AFP responses containing oversized or malformed directory metadata, causing a heap-based buffer overflow. The kernel fails to validate memory bounds, leading to arbitrary code execution with kernel privileges. Exploiting this requires luring a victim into mounting a rogue AFP share. Successful exploitation grants full system control due to the flaw’s kernel-level impact.
DailyCVE Form
Platform: macOS
Version: <14.7.6, <15.5
Vulnerability: Kernel memory corruption
Severity: Critical
Date: 05/27/2025
Prediction: Patch expected by 06/10/2025
What Undercode Say:
Analytics:
- Exploitability: High (network-accessible, low user interaction).
- Attack Vector: Malicious AFP server.
- Mitigation: Disable AFP, use SMB.
Exploit (PoC Concept):
import socket
def craft_malicious_afp_response():
payload = b"\x41" 1024 Overflow trigger
return payload
Simulate rogue AFP server
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.bind(("0.0.0.0", 548))
sock.listen(1)
conn, addr = sock.accept()
conn.send(craft_malicious_afp_response())
Protection Commands:
1. Disable AFP:
sudo launchctl unload -w /System/Library/LaunchDaemons/com.apple.AppleFileServer.plist
2. Update Check:
softwareupdate --list --all
Kernel Hardening:
// Hypothetical patch: Bounds check in AFP kernel module
if (data_len > MAX_AFP_ENTRY_SIZE) {
panic("AFP: Invalid entry size");
}
Network Mitigation:
sudo pfctl -e -f /etc/pf.conf Block AFP port (548)
Log Monitoring:
log stream --predicate 'eventMessage contains "AFP"' --debug
References:
- Apple Security Advisory: APSA-2025-003
- NVD: CVE-2025-31246
End of Report.
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
