CVE-2024-22915
📋 TL;DR
A heap-use-after-free vulnerability in SWFTools v0.9.2 allows attackers to execute arbitrary code by exploiting improper memory handling in the swf_DeleteTag function. This affects users who process untrusted SWF files with vulnerable versions of SWFTools. Successful exploitation could lead to complete system compromise.
💻 Affected Systems
- SWFTools
📦 What is this software?
Swftools by Swftools
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution with full system compromise, allowing attacker to install malware, exfiltrate data, or pivot to other systems.
Likely Case
Local privilege escalation or denial of service when processing malicious SWF files, potentially leading to system instability.
If Mitigated
Limited impact with proper sandboxing and input validation, potentially only causing application crashes.
🎯 Exploit Status
Exploitation requires crafting a malicious SWF file that triggers the heap-use-after-free condition. No public exploit code is currently available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: https://github.com/matthiaskramm/swftools/issues/215
Restart Required: No
Instructions:
1. Check GitHub issue #215 for any updates. 2. Consider alternative SWF processing tools. 3. If source code fix becomes available, recompile SWFTools from patched source.
🔧 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/backup_swftools/
sudo chmod 000 /usr/bin/swf*
Sandbox execution
linuxRun SWFTools in a container or sandbox to limit potential damage from exploitation.
docker run --rm -v $(pwd):/data alpine sh -c 'apk add swftools && swfrender input.swf -o output.png'
🧯 If You Can't Patch
- Implement strict input validation - only allow trusted SWF files from verified sources
- Monitor systems for unexpected crashes of SWFTools processes and investigate any anomalies
🔍 How to Verify
Check if Vulnerable:
Check SWFTools version: swfrender --version or swfextract --version. If output shows v0.9.2, system is vulnerable.Check Version:
swfrender --version 2>&1 | head -1Verify Fix Applied:
After implementing workarounds, test that SWFTools commands no longer execute or run in restricted environments.📡 Detection & Monitoring
Log Indicators:
- Segmentation fault errors from SWFTools processes
- Unexpected termination of swf* processes
- High memory usage followed by crashes
Network Indicators:
- Unusual outbound connections from systems running SWFTools
- File uploads of SWF files to processing systems
SIEM Query:
process_name:swf* AND (event_type:crash OR exit_code:139 OR exit_code:-1073741819)