CVE-2024-22913
📋 TL;DR
A heap buffer overflow vulnerability in SWFTools v0.9.2 allows remote code execution when processing malicious SWF files. This affects systems running vulnerable versions of SWFTools that process untrusted SWF content. Attackers can exploit this to execute arbitrary code on affected systems.
💻 Affected Systems
- SWFTools
📦 What is this software?
Swftools by Swftools
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with attacker gaining complete control over the affected system, potentially leading to data theft, ransomware deployment, or lateral movement within the network.
Likely Case
Remote code execution leading to installation of malware, backdoors, or cryptocurrency miners on vulnerable systems processing malicious SWF files.
If Mitigated
Denial of service or application crash if exploit fails or memory protections prevent code execution.
🎯 Exploit Status
Exploitation requires crafting a malicious SWF file that triggers the heap buffer overflow. The CVSS score of 7.8 suggests exploitation is feasible but may require some technical skill.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: https://github.com/matthiaskramm/swftools/issues/213
Restart Required: No
Instructions:
1. Check the GitHub issue for any patches or updates. 2. If no patch is available, consider workarounds or alternative software. 3. Monitor the SWFTools repository for security updates.
🔧 Temporary Workarounds
Disable SWF Processing
linuxPrevent SWFTools from processing SWF files by removing or restricting access to the tool.
sudo mv /usr/bin/swf* /tmp/
sudo chmod 000 /usr/bin/swf*
Sandbox Execution
linuxRun SWFTools in a container or sandboxed environment to limit potential damage from exploitation.
docker run --rm -v $(pwd):/data alpine/swftools
🧯 If You Can't Patch
- Isolate affected systems from untrusted networks and restrict SWF file processing to trusted sources only.
- Implement application whitelisting to prevent execution of unauthorized binaries that may result from exploitation.
🔍 How to Verify
Check if Vulnerable:
Check SWFTools version: swfrender --version or swfextract --version. If output shows v0.9.2, the system is vulnerable.Check Version:
swfrender --version 2>&1 | grep -i versionVerify Fix Applied:
After applying workarounds, test that SWFTools cannot process SWF files or is no longer accessible.📡 Detection & Monitoring
Log Indicators:
- Unexpected process crashes of SWFTools binaries
- Unusual memory allocation patterns in system logs
- Execution of unexpected binaries following SWFTools processes
Network Indicators:
- Unusual outbound connections from systems running SWFTools
- Downloads of SWF files from untrusted sources
SIEM Query:
process_name:swf* AND (event_id:1000 OR exit_code:3221225477)