CVE-2024-22911
📋 TL;DR
A stack-buffer-underflow vulnerability in SWFTools v0.9.2 allows attackers to read memory contents beyond allocated buffer boundaries when parsing SWF files. This affects users processing untrusted SWF files with vulnerable SWFTools versions. The vulnerability could lead to information disclosure or be combined with other vulnerabilities for more severe attacks.
💻 Affected Systems
- SWFTools
📦 What is this software?
Swftools by Swftools
⚠️ Risk & Real-World Impact
Worst Case
Memory corruption leading to arbitrary code execution, potentially allowing full system compromise if combined with other vulnerabilities.
Likely Case
Information disclosure through memory read, potentially exposing sensitive data or application secrets.
If Mitigated
Denial of service through application crash when processing malicious SWF files.
🎯 Exploit Status
Exploitation requires crafting a malicious SWF file that triggers the buffer underflow condition. No public exploit code has been identified.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check GitHub repository for latest fixes
Vendor Advisory: https://github.com/matthiaskramm/swftools/issues/216
Restart Required: Yes
Instructions:
1. Check current SWFTools version. 2. Update to latest version from GitHub repository. 3. Recompile if using source. 4. Restart any services using SWFTools.
🔧 Temporary Workarounds
Disable SWF Processing
allTemporarily disable SWF file processing in applications using SWFTools
Input Validation
allImplement strict validation of SWF files before processing with SWFTools
🧯 If You Can't Patch
- Isolate SWFTools usage to dedicated systems with no sensitive data
- Implement network segmentation to limit access to systems using SWFTools
🔍 How to Verify
Check if Vulnerable:
Check SWFTools version with 'swfc --version' or 'swfrender --version'Check Version:
swfc --versionVerify Fix Applied:
Verify updated version no longer contains vulnerable parseExpression function at src/swfc.c:2602📡 Detection & Monitoring
Log Indicators:
- Application crashes when processing SWF files
- Memory access violation errors in system logs
Network Indicators:
- Unusual SWF file uploads to systems using SWFTools
SIEM Query:
Process:swfc OR Process:swfrender AND (EventID:1000 OR "access violation")