CVE-2024-22955
📋 TL;DR
CVE-2024-22955 is a stack-buffer-underflow vulnerability in swftools 0.9.2 that allows attackers to read sensitive memory contents or potentially execute arbitrary code by crafting malicious SWF files. This affects any system running vulnerable versions of swftools, particularly those processing untrusted SWF content.
💻 Affected Systems
- swftools
📦 What is this software?
Swftools by Swftools
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise if the vulnerability can be chained with other exploits or memory corruption leads to control flow hijacking.
Likely Case
Information disclosure through memory leaks, denial of service via application crashes, or limited code execution within the application context.
If Mitigated
Application crash with no further impact if proper memory protections (ASLR, stack canaries) are enabled and exploit attempts are detected.
🎯 Exploit Status
Exploitation requires crafting a malicious SWF file; no public exploit code is currently available, but the vulnerability details are public.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: https://github.com/matthiaskramm/swftools/issues/207
Restart Required: No
Instructions:
1. Monitor the GitHub issue for patches. 2. If a patch is released, download the updated source code. 3. Compile and install the patched version. 4. Replace any vulnerable binaries.
🔧 Temporary Workarounds
Disable SWF processing
linuxPrevent swftools from processing SWF files by removing or restricting access to the tool.
sudo rm /usr/local/bin/swfc
sudo chmod 000 /usr/local/bin/swfc
Input validation
allImplement strict validation of SWF files before processing with swftools.
🧯 If You Can't Patch
- Isolate swftools to a restricted environment with minimal privileges.
- Monitor for crashes or unusual memory usage in swftools processes.
🔍 How to Verify
Check if Vulnerable:
Check swftools version: swfc --version 2>&1 | grep -i versionCheck Version:
swfc --version 2>&1 | head -1Verify Fix Applied:
After patching, verify the version is updated and test with known safe SWF files.📡 Detection & Monitoring
Log Indicators:
- Application crashes of swftools processes
- Memory access violation errors in system logs
Network Indicators:
- Unusual SWF file uploads to systems using swftools
SIEM Query:
process_name:"swfc" AND (event_type:"crash" OR memory_violation)