CVE-2024-35244
📋 TL;DR
This vulnerability involves hidden maintenance accounts in Sharp and Toshiba multifunction printers/copiers. Attackers who obtain these account passwords (e.g., from coredump files) can reconfigure devices, potentially gaining administrative access. Organizations using affected Sharp and Toshiba MFP models are impacted.
💻 Affected Systems
- Sharp multifunction printers/copiers
- Toshiba multifunction printers/copiers
⚠️ 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
Complete device takeover allowing attackers to reconfigure network settings, access scanned documents, install malicious firmware, or use the device as an internal network pivot point.
Likely Case
Unauthorized administrative access to device configuration, potentially enabling data exfiltration of scanned documents or disruption of printing services.
If Mitigated
Limited impact if devices are properly segmented and monitored, though configuration changes could still occur.
🎯 Exploit Status
Exploitation requires obtaining hidden account passwords first, which may be found in coredump files or through other means. Public research documents the vulnerability details.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor-specific firmware updates
Vendor Advisory: https://global.sharp/products/copier/info/info_security_2024-05.html
Restart Required: Yes
Instructions:
1. Identify affected models from vendor advisories. 2. Download latest firmware from vendor support sites. 3. Apply firmware update following vendor instructions. 4. Verify update completion and restart devices.
🔧 Temporary Workarounds
Network segmentation
allIsolate MFP devices on separate VLANs with restricted access
Access control restrictions
allImplement strict firewall rules limiting management interface access to authorized IPs only
🧯 If You Can't Patch
- Segment devices on isolated network segments with strict access controls
- Monitor device logs for unauthorized configuration changes and disable remote management if not required
🔍 How to Verify
Check if Vulnerable:
Check device model and firmware version against vendor advisories. Review device logs for unauthorized access attempts.Check Version:
Check device web interface or control panel for firmware version informationVerify Fix Applied:
Verify firmware version has been updated to patched version. Test that hidden accounts cannot be used for authentication.📡 Detection & Monitoring
Log Indicators:
- Failed authentication attempts to maintenance accounts
- Unexpected configuration changes
- Access from unauthorized IP addresses to management interface
Network Indicators:
- Unusual traffic patterns to/from MFP management ports
- Connections to device on non-standard ports
SIEM Query:
source="mfp-logs" AND (event_type="auth_failure" OR event_type="config_change")🔗 References
- https://global.sharp/products/copier/info/info_security_2024-05.html
- https://jp.sharp/business/print/information/info_security_2024-05.html
- https://jvn.jp/en/vu/JVNVU93051062/
- https://pierrekim.github.io/blog/2024-06-27-sharp-mfp-17-vulnerabilities.html
- https://www.toshibatec.co.jp/information/20240531_02.html
- https://www.toshibatec.com/information/20240531_02.html
- http://seclists.org/fulldisclosure/2024/Jul/0
