How the CVE Works:
CVE-2025-2152 is a critical heap-based buffer overflow vulnerability in Open Asset Import Library (Assimp) version 5.4.3. The flaw resides in the `Assimp::BaseImporter::ConvertToUTF8` function within the `BaseImporter.cpp` file, which is part of the File Handler component. This function is responsible for converting input data to UTF-8 encoding. Due to improper bounds checking, an attacker can craft a malicious file that, when processed by Assimp, triggers a heap-based buffer overflow. This allows the attacker to overwrite adjacent memory, potentially leading to arbitrary code execution or a crash. The vulnerability is remotely exploitable, meaning an attacker can deliver the malicious file via network protocols or user-uploaded content.
DailyCVE Form:
Platform: Assimp
Version: 5.4.3
Vulnerability: Heap-based Buffer Overflow
Severity: Critical
Date: 03/10/2025
What Undercode Say:
Exploitation:
- Crafting Malicious Files: Attackers can create specially crafted 3D model files (e.g., OBJ, FBX) that exploit the buffer overflow in the `ConvertToUTF8` function.
- Remote Delivery: The malicious file can be delivered via email, web uploads, or network shares.
- Payload Execution: Successful exploitation can lead to arbitrary code execution under the context of the application using Assimp.
Protection:
- Patch Application: Update to the latest version of Assimp if a patch is available.
- Input Validation: Implement strict input validation for file uploads and processing.
- Memory Sanitizers: Use tools like AddressSanitizer to detect and mitigate buffer overflows during development.
Commands:
1. Check Assimp Version:
assimp version
2. Compile with AddressSanitizer:
gcc -fsanitize=address -o your_program your_program.c -lassimp
Code Snippets:
1. Input Validation Example:
if (fileSize > MAX_ALLOWED_SIZE) {
throw std::runtime_error("File size exceeds allowed limit");
}
2. Safe UTF-8 Conversion:
std::string safeConvertToUTF8(const std::string& input) {
if (input.size() > MAX_UTF8_SIZE) {
throw std::runtime_error("Input exceeds maximum UTF-8 size");
}
// Perform conversion
return convertedString;
}
Analytics:
1. CVSS 4.0 Score: 5.3 (Medium)
2. Attack Vector: Network (AV:N)
- Impact: Low confidentiality, integrity, and availability (VC:L, VI:L, VA:L)
4. Exploitability: High (UI:P, PR:N)
References:
References:
Reported By: https://nvd.nist.gov/vuln/detail/CVE-2025-2152
Extra Source Hub:
Undercode
