CVE-2025-20799

''' CVE-2025-20799 PoC - MediaTek c2ps Use After Free Note: This is a conceptual PoC for demonstration purposes only. Actual exploitation requires specific device firmware and debugging environment. ''' import ctypes import os # Simulated vulnerable function interface class C2PSVulnerable: def __init__(self): self.handle = None self.heap_spray_buffer = None def initialize(self): '''Initialize c2ps service with vulnerable memory allocation''' print("[*] Initializing c2ps service...") # Simulated initialization that may have UAF condition self.handle = ctypes.c_void_p(0x1000) return True def trigger_uaf(self): '''Trigger use-after-free condition in c2ps component''' print("[*] Triggering Use After Free condition...") # Step 1: Allocate and hold reference to vulnerable object obj = self._allocate_object() print(f"[+] Allocated object at: {hex(obj) if obj else 0}") # Step 2: Free the object (without clearing reference) self._free_object(obj) print("[!] Object freed but reference retained (UAF condition)") # Step 3: Heap spray to control freed memory self._heap_spray() print("[+] Heap spray completed") # Step 4: Reuse freed memory through dangling pointer result = self._reuse_freed_memory() print(f"[*] Memory reuse result: {result}") return result def _allocate_object(self): '''Allocate memory object in c2ps context''' # Simulated allocation return id(ctypes.create_string_buffer(256)) def _free_object(self, obj_addr): '''Free object without clearing reference''' # Simulated free operation pass def _heap_spray(self): '''Spray heap to control freed memory region''' spray_data = b'\x41' * 1024 self.heap_spray_buffer = spray_data return True def _reuse_freed_memory(self): '''Attempt to reuse freed memory through dangling pointer''' if self.handle: # This would trigger the UAF in real scenario return "Privilege Escalation Triggered" return "Failed" def main(): print("="*60) print("CVE-2025-20799 MediaTek c2ps Use After Free PoC") print("="*60) poc = C2PSVulnerable() # Check prerequisites if os.geteuid() != 0: print("[!] Warning: This PoC requires elevated privileges") print("[!] System privileges needed for exploitation") poc.initialize() result = poc.trigger_uaf() print("\n[*] PoC execution completed") print(f"[*] Result: {result}") print("\n[!] Note: Apply MediaTek patch ALPS10274607 to remediate") if __name__ == "__main__": main()

{"cve": {"id": "CVE-2025-20799", "sourceIdentifier": "[email protected]", "published": "2026-01-06T02:15:43.937", "lastModified": "2026-01-08T19:23:51.350", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In c2ps, there is a possible memory corruption due to use after free. This could lead to local escalation of privilege if a malicious actor has already obtained the System privilege. User interaction is not needed for exploitation. Patch ID: ALPS10274607; Issue ID: MSV-5049."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "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-416"}]}], "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"}, {"vulnerable": true, "criteria": "cpe:2.3:o:google:android:16.0:-:*:*:*:*:*:*", "matchCriteriaId": "02882AB1-7993-47DD-84A0-8DF4272D85ED"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6899:-:*:*:*:*:*:*:*", "matchCriteriaId": "C6E9F80F-9AC9-41E0-BB14-9DB6F14B62CD"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6991:-:*:*:*:*:*:*:*", "matchCriteriaId": "CBBB30DF-E963-4940-B742-F6801F68C3FC"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6993:-:*:*:*:*:*:*:*", "matchCriteriaId": "57E92BE0-5E65-4770-8E1A-0E5D07A38164"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt8793:-:*:*:*:*:*:*:*", "matchCriteriaId": "2FBD3487-F8CE-406C-8BD7-DD57FF8CD60B"}]}]}], "references": [{"url": "https://corp.mediatek.com/product-security-bulletin/January-2026", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}