CVE-2024-35333
📋 TL;DR
A stack buffer overflow vulnerability in html2xhtml 1.3 allows attackers to execute arbitrary code or cause denial of service by providing specially crafted input. This affects systems running the vulnerable html2xhtml software, particularly when processing untrusted HTML content.
💻 Affected Systems
- html2xhtml
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution with attacker gaining full control of the affected system, potentially leading to data theft, system compromise, or lateral movement within the network.
Likely Case
Denial of service causing application crashes or system instability when processing malicious HTML files.
If Mitigated
Limited impact with proper input validation and memory protection mechanisms in place, potentially reduced to application crashes without code execution.
🎯 Exploit Status
Proof of concept available on GitHub demonstrates the buffer overflow. Exploitation requires feeding malicious input to the vulnerable function.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: Not available
Restart Required: No
Instructions:
1. Check for updated version from software maintainers
2. If no patch available, consider workarounds or alternative software
3. Monitor for security updates
🔧 Temporary Workarounds
Input Validation
allImplement strict input validation for HTML files processed by html2xhtml
Memory Protection
linuxEnable stack protection mechanisms like ASLR and stack canaries if supported
echo 2 > /proc/sys/kernel/randomize_va_space
🧯 If You Can't Patch
- Discontinue use of html2xhtml for processing untrusted HTML content
- Implement network segmentation to isolate systems running vulnerable software
🔍 How to Verify
Check if Vulnerable:
Check html2xhtml version: html2xhtml --versionCheck Version:
html2xhtml --versionVerify Fix Applied:
Verify version is updated beyond 1.3 or check for patched source code📡 Detection & Monitoring
Log Indicators:
- Application crashes with segmentation faults
- Unusual memory access patterns in system logs
Network Indicators:
- Unusual file transfers to systems running html2xhtml
SIEM Query:
source="application_logs" AND ("segmentation fault" OR "buffer overflow") AND process="html2xhtml"