CVE-2025-20804

// CVE-2025-20804 PoC - MediaTek dpe Use After Free (Conceptual) // This is a conceptual PoC for educational purposes only #include <stdio.h> #include <stdlib.h> #include <string.h> // Simulated vulnerable function structure typedef struct { void (*callback)(void*); char* buffer; size_t size; } dpe_context_t; // Vulnerable function simulating dpe component behavior void vulnerable_dpe_operation(dpe_context_t* ctx) { // Free the buffer (simulating the vulnerable free operation) if (ctx->buffer) { free(ctx->buffer); ctx->buffer = NULL; // Missing: should prevent use after free } // VULNERABILITY: Use after free - accessing freed memory if (ctx->buffer != NULL) { // Check bypassed memset(ctx->buffer, 0, ctx->size); // Use after free occurs here } // Callback could be hijacked if attacker controls freed memory if (ctx->callback) { ctx->callback(ctx->buffer); } } // Trigger function for local privilege escalation int trigger_cve_2025_20804(void) { dpe_context_t* ctx = (dpe_context_t*)malloc(sizeof(dpe_context_t)); if (!ctx) return -1; ctx->buffer = (char*)malloc(256); ctx->size = 256; ctx->callback = NULL; // Attacker with system privileges could: // 1. Allocate memory at freed location // 2. Place shellcode or ROP chain // 3. Trigger the use-after-free // 4. Achieve privilege escalation vulnerable_dpe_operation(ctx); free(ctx); return 0; } // Note: Actual exploitation requires system-level access and // specific MediaTek dpe component interaction via device interfaces

{"cve": {"id": "CVE-2025-20804", "sourceIdentifier": "[email protected]", "published": "2026-01-06T02:15:44.593", "lastModified": "2026-01-08T19:22:55.840", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In dpe, 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 needed for exploitation. Patch ID: ALPS10198951; Issue ID: MSV-4503."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H", "baseScore": 6.7, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "HIGH", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 0.8, "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: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"}]}]}], "references": [{"url": "https://corp.mediatek.com/product-security-bulletin/January-2026", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}