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How CVE-2025-3196 Works
The vulnerability resides in `Assimp::MD2Importer::InternReadFile` within MD2Loader.cpp. When processing a malformed MD2 file, the function fails to validate the length of the `Name` argument, leading to a stack-based buffer overflow. Attackers can craft a malicious MD2 file with an overly long `Name` field, overwriting adjacent memory and potentially executing arbitrary code. The exploit requires local access, but successful exploitation grants the attacker the same privileges as the application using Assimp.
DailyCVE Form
Platform: Assimp
Version: 5.4.3
Vulnerability: Stack overflow
Severity: Critical
Date: 05/28/2025
Prediction: Patch by 06/15/2025
What Undercode Say:
Exploitation Analysis
- Craft a malformed MD2 file with oversized `Name` field.
2. Trigger parsing via `Assimp::Importer::ReadFile()`.
3. Overflow corrupts stack memory, enabling RCE.
Protection Measures
- Patch: Upgrade to Assimp 5.4.4+ when released.
- Mitigation: Disable MD2 file parsing if unused.
- Sanitization: Validate `Name` length before processing.
Detection Commands
Check Assimp version apt list --installed | grep assimp Scan for vulnerable MD2 files strings -n 100 suspicious.md2 | grep "Name"
Exploit Code Snippet (PoC)
include <assimp/Importer.hpp>
void exploit() {
Assimp::Importer importer;
importer.ReadFile("malicious.md2", 0); // Triggers overflow
}
Patch Verification
Post-patch, check MD2Loader.cpp for bounds checks: grep "if (Name.length() > MAX_LEN)" /usr/include/assimp/MD2Loader.cpp
Memory Protection
Enable compiler flags:
-fstack-protector-strong -Wstack-usage=1024
Log Monitoring
Monitor Assimp crashes journalctl -u your_app | grep "segfault.assimp"
Network Restrictions
Block unnecessary local file access iptables -A INPUT -p tcp --dport 1337 -j DROP
Static Analysis
Use Clang-tidy:
clang-tidy --checks=buffer-overflow MD2Loader.cpp
Fuzzing Setup
AFL++ command for MD2 fuzzing afl-fuzz -i input_md2/ -o findings/ ./assimp_parser @@
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
