CVE-2025-20789

# CVE-2025-20789 PoC - MediaTek GPU pdma Information Disclosure # This PoC demonstrates the concept of bounds check bypass in GPU PDMA import ctypes import struct class GPUPDMABoundsCheckBypass: """ Proof of Concept for CVE-2025-20789 MediaTek GPU PDMA Missing Bounds Check Information Disclosure """ def __init__(self): self.patch_id = "ALPS10117741" self.issue_id = "MSV-4538" def trigger_bounds_check_bypass(self, malicious_addr): """ Trigger the bounds check bypass in GPU PDMA Args: malicious_addr: Out-of-bounds memory address to access Returns: Leaked data if successful, None otherwise """ # Simulate GPU PDMA operation structure pdma_request = { 'src_addr': malicious_addr, 'dst_addr': 0x10000000, 'size': 0x1000, 'flags': 0x01 # PDMA flag } # Vulnerable: No bounds check on src_addr # In real scenario, this would access memory beyond intended region try: # Simulate memory read without bounds validation leaked_data = self._gpu_memory_read(pdma_request) return leaked_data except Exception as e: print(f"Error: {e}") return None def _gpu_memory_read(self, request): """ Simulated GPU memory read operation In vulnerable version: No bounds checking In patched version: Should validate address range """ # Vulnerable code pattern (DO NOT USE IN PRODUCTION) # if not self._validate_bounds(request['src_addr']): # raise SecurityException("Bounds check failed") # Simulate reading arbitrary memory print(f"[!] Reading from potentially out-of-bounds address: {hex(request['src_addr'])}") return b"LEAKED_DATA_SIMULATION" def check_vulnerability_status(self): """ Check if system is vulnerable to CVE-2025-20789 """ # In real implementation, this would check: # 1. MediaTek GPU driver version # 2. Patch level (ALPS10117741) # 3. System vulnerability status print(f"[*] Checking vulnerability status...") print(f"[*] Patch ID: {self.patch_id}") print(f"[*] Issue ID: {self.issue_id}") print("[*] Please update to patched version to mitigate this vulnerability") if __name__ == "__main__": poc = GPUPDMABoundsCheckBypass() poc.check_vulnerability_status() # Demonstrate potential exploit scenario # Target address beyond valid range malicious_address = 0xFFFFFFFF - 0x1000 result = poc.trigger_bounds_check_bypass(malicious_address) if result: print(f"[!] Successfully triggered information disclosure")

{"cve": {"id": "CVE-2025-20789", "sourceIdentifier": "[email protected]", "published": "2025-12-02T03:16:19.767", "lastModified": "2025-12-03T20:32:10.803", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In GPU pdma, there is a possible information disclosure due to a missing bounds check. This could lead to local information disclosure with no additional execution privileges needed. User interaction is needed for exploitation. Patch ID: ALPS10117741; Issue ID: MSV-4538."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N", "baseScore": 4.4, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 1.8, "impactScore": 2.5}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-201"}]}], "configurations": [{"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:google:android:15.0:*:*:*:*:*:*:*", "matchCriteriaId": "8538774C-906D-4B03-A3E7-FA7A55E0DA9E"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6781:-:*:*:*:*:*:*:*", "matchCriteriaId": "C4EEE021-6B2A-47A0-AC6B-55525A40D718"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6833:-:*:*:*:*:*:*:*", "matchCriteriaId": "9814939B-F05E-4870-90C0-7C0F6BAAEB39"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6853:-:*:*:*:*:*:*:*", "matchCriteriaId": "366F1912-756B-443E-9962-224937DD7DFB"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6877:-:*:*:*:*:*:*:*", "matchCriteriaId": "7CA9352F-E9BD-4656-9B7C-4AFEE2C78E58"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6893:-:*:*:*:*:*:*:*", "matchCriteriaId": "213B5C7F-D965-4312-9CDF-4F06FA77D401"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt8196:-:*:*:*:*:*:*:*", "matchCriteriaId": "FB0C4D80-28BC-4C4D-B522-AD9EC5222A2E"}]}]}], "references": [{"url": "https://corp.mediatek.com/product-security-bulletin/December-2025", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}