CVE-2024-27142
📋 TL;DR
This vulnerability affects Toshiba printers that use XML communication for their API endpoint. Attackers can exploit a time-based blind XML External Entity (XXE) vulnerability in the XML parsing library to cause denial-of-service (DoS) or retrieve information from the printer. Organizations using affected Toshiba printer models are at risk.
💻 Affected Systems
- Toshiba e-STUDIO and e-BRIDGE series printers
⚠️ 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
An attacker could retrieve sensitive information from the printer's file system, cause permanent DoS by exhausting system resources, or potentially pivot to internal network resources.
Likely Case
Attackers will likely use this vulnerability for DoS attacks against vulnerable printers, disrupting printing services and potentially retrieving limited system information.
If Mitigated
With proper network segmentation and XML parsing hardening, impact is limited to printer service disruption without data exfiltration or lateral movement.
🎯 Exploit Status
Exploitation requires network access to the printer's API endpoint. The time-based blind XXE technique is well-documented and tools exist for automated exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Refer to Toshiba advisory for specific firmware versions
Vendor Advisory: https://www.toshibatec.com/information/20240531_01.html
Restart Required: Yes
Instructions:
1. Check Toshiba advisory for affected models. 2. Download latest firmware from Toshiba support portal. 3. Apply firmware update following manufacturer instructions. 4. Restart printer to activate changes.
🔧 Temporary Workarounds
Network Segmentation
allIsolate printers on separate VLANs with strict firewall rules limiting access to printer management interfaces
Disable External XML Entities
allConfigure XML parser to disable external entity processing if printer configuration allows
🧯 If You Can't Patch
- Segment printer network and restrict access to trusted IP addresses only
- Monitor printer network traffic for unusual XML payloads or DoS attempts
🔍 How to Verify
Check if Vulnerable:
Check printer model and firmware version against Toshiba advisory. Test with XXE payloads targeting the printer's API endpoint.Check Version:
Check printer web interface or use SNMP query: snmpget -v2c -c public printer_ip .1.3.6.1.2.1.25.6.3.1.2Verify Fix Applied:
Verify firmware version matches patched version from advisory. Test with XXE payloads to confirm they no longer work.📡 Detection & Monitoring
Log Indicators:
- Unusual XML requests to printer API
- Repeated failed API calls
- Printer service disruption logs
Network Indicators:
- XML payloads with DOCTYPE declarations
- Unusual traffic patterns to printer management ports
- External entity references in XML
SIEM Query:
source="printer_logs" AND (message="*DOCTYPE*" OR message="*ENTITY*" OR message="*SYSTEM*")🔗 References
- http://seclists.org/fulldisclosure/2024/Jul/1
- https://jvn.jp/en/vu/JVNVU97136265/index.html
- https://www.toshibatec.com/information/20240531_01.html
- https://www.toshibatec.com/information/pdf/information20240531_01.pdf
- http://seclists.org/fulldisclosure/2024/Jul/1
- https://jvn.jp/en/vu/JVNVU97136265/index.html
- https://www.toshibatec.com/information/20240531_01.html
- https://www.toshibatec.com/information/pdf/information20240531_01.pdf
