CVE-2025-27374

// CVE-2025-27374 PoC - Secure Boot Length Check Bypass // This PoC demonstrates the concept of the vulnerability #include <stdio.h> #include <stdint.h> #include <string.h> // Simulated Secure Boot header structure typedef struct { uint32_t magic; uint32_t image_size; uint32_t load_address; uint32_t entry_point; uint8_t signature[256]; uint8_t* image_data; } secure_boot_header_t; // Vulnerable function - missing length check void load_secure_image(secure_boot_header_t* header) { uint8_t buffer[1024]; // VULNERABILITY: Missing boundary check on image_size // Should check: if (header->image_size > sizeof(buffer)) memcpy(buffer, header->image_data, header->image_size); // If image_size > 1024, this causes OOB write } // Secure version with proper validation void load_secure_image_fixed(secure_boot_header_t* header) { uint8_t buffer[1024]; // FIX: Proper length check before copy if (header->image_size > sizeof(buffer)) { printf("[-] Error: Image size exceeds buffer boundary\n"); return; } memcpy(buffer, header->image_data, header->image_size); printf("[+] Secure image loaded successfully\n"); } // Exploit demonstration int main() { printf("[*] CVE-2025-27374 PoC - Secure Boot OOB Write\n"); // Create malicious header with oversized image_size secure_boot_header_t malicious_header; malicious_header.magic = 0xDEADBEEF; malicious_header.image_size = 2048; // Exceeds buffer size (1024) malicious_header.load_address = 0x10000; malicious_header.entry_point = 0x10000; // Allocate oversized data malicious_header.image_data = (uint8_t*)malloc(2048); memset(malicious_header.image_data, 0x41, 2048); printf("[*] Triggering vulnerable load function...\n"); load_secure_image(&malicious_header); // OOB write occurs printf("[+] PoC demonstrates buffer overflow in Secure Boot\n"); printf("[*] Mitigation: Apply Samsung security update\n"); free(malicious_header.image_data); return 0; }

{"cve": {"id": "CVE-2025-27374", "sourceIdentifier": "[email protected]", "published": "2025-11-04T21:15:36.523", "lastModified": "2025-11-07T13:00:04.273", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "An issue was discovered in the Secure Boot component in Samsung Mobile Processor and Wearable Processor Exynos 9820, 9825, 980, 990, 850, 1080, 1280, 2200, 1330, 1380, 1480, 2400. The lack of a length check leads to out-of-bounds writes."}], "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:N/I:N/A:L", "baseScore": 5.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "LOW"}, "exploitabilityScore": 3.9, "impactScore": 1.4}]}, "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_9825_firmware:-:*:*:*:*:*:*:*", "matchCriteriaId": "7584E423-2C8E-4576-AB84-BC3A8351B3F9"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:h:samsung:exynos_9825:-:*:*:*:*:*:*:*", "matchCriteriaId": "77A6027E-CD79-4DBD-B065-BE5AE7967F3B"}]}]}, {"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:samsung:exynos_9820_firmware:-:*:*:*:*:*:*:*", "matchCriteriaId": "1E582F31-BCC1-4276-BC34-A38EDCC4BB01"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:h:samsung:exynos_9820:-:*:*:*:*:*:*:*", "matchCriteriaId": "1B8C35DE-1C58-4C6E-BB15-0E3C2FECB8DA"}]}]}, {"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_2400_firmware:-:*:*:*:*:*:*:*", "matchCriteriaId": "16D9272E-1794-48FF-B6A4-8F48395BA38E"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:h:samsung:exynos_2400:-:*:*:*:*:*:*:*", "matchCriteriaId": "932F5FB3-5527-44D7-9DD9-EF03963E3CA3"}]}]}, {"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:samsung:exynos_1480_firmware:-:*:*:*:*:*:*:*", "matchCriteriaId": "64897B0D-EBF6-4BEB-BF54-ABCDBFAB45E0"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:h:samsung:exynos_1480:-:*:*:*:*:*:*:*", "matchCriteriaId": "F3F328B4-0442-4748-B5EE-DD1CEE50D6CF"}]}]}, {"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:-:*:*:*:*:*:*:*", "matchCriteriaId": "61E72146-72FE-4B54-AB79-3C665E7F016C"}]}]}, {"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_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"}]}]} ... 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