CVE-2019-13206 – This CVE describes a buffer overflow vulnerabil... (How to Fix)

Q: What is the severity of CVE-2019-13206?

CVE-2019-13206 has a CVSS score of 8.8 (HIGH). This CVE describes a buffer overflow vulnerability in Kyocera printer web interfaces that allows authenticated attackers to crash devices or potentially execute arbitrary code. It affects specific Kyocera printer models with vulnerable firmware versions. Organizations using these printers are at risk if attackers gain authenticated access to the web management interface.

📋 TL;DR

This CVE describes a buffer overflow vulnerability in Kyocera printer web interfaces that allows authenticated attackers to crash devices or potentially execute arbitrary code. It affects specific Kyocera printer models with vulnerable firmware versions. Organizations using these printers are at risk if attackers gain authenticated access to the web management interface.

💻 Affected Systems

Products:

Kyocera ECOSYS M5526cdw
Other unspecified Kyocera printer models

Versions: 2R7_2000.001.701 and likely other versions

Operating Systems: Printer firmware

Default Config Vulnerable: ⚠️ Yes

Notes: Vulnerability exists in the Document Boxes functionality of the web application. Multiple parameters are affected.

📦 What is this software?

Ecosys M5526cdw Firmware by Kyocera

View all CVEs affecting Ecosys M5526cdw Firmware →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Remote code execution leading to complete device compromise, lateral movement to connected networks, and persistent backdoor installation.

🟠

Likely Case

Denial of service causing printer downtime and disruption of printing services.

🟢

If Mitigated

Limited impact with proper network segmentation and access controls preventing unauthorized access to printer management interfaces.

🌐 Internet-Facing: HIGH - Printers exposed to the internet with web management enabled are directly vulnerable to exploitation.

🏢 Internal Only: MEDIUM - Requires authenticated access, but internal attackers or compromised accounts could exploit the vulnerability.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ✅ No

Complexity: MEDIUM

Requires authenticated access to the printer's web interface. Buffer overflow exploitation typically requires some technical skill.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Unknown specific version - check Kyocera security advisories

Vendor Advisory: https://www.kyoceradocumentsolutions.com/en/support/security_information.html

Restart Required: Yes

Instructions:

1. Check Kyocera security advisories for affected models. 2. Download latest firmware from Kyocera support portal. 3. Upload firmware via printer web interface. 4. Reboot printer after update.

🔧 Temporary Workarounds

Disable web interface access

all

Disable or restrict access to the printer's web management interface

Network segmentation

all

Isolate printers on separate VLAN with restricted access

🧯 If You Can't Patch

Implement strict network access controls to limit who can reach printer management interfaces
Disable unused Document Boxes functionality if possible through printer configuration

🔍 How to Verify

Check if Vulnerable:

Check printer firmware version via web interface at http://[printer-ip]/wcd/system.xml and compare with Kyocera security advisories

Check Version:

curl http://[printer-ip]/wcd/system.xml | grep -i version

Verify Fix Applied:

Verify firmware version has been updated to patched version and test Document Boxes functionality

📡 Detection & Monitoring

Log Indicators:

Multiple failed authentication attempts to printer web interface
Unusual Document Boxes API calls
Printer crash/reboot events

Network Indicators:

Unusual HTTP POST requests to printer Document Boxes endpoints
Buffer overflow patterns in network traffic to printer

SIEM Query:

source="printer_logs" AND (event="authentication_failure" OR event="web_interface_access") | stats count by src_ip dest_ip

📊 Metadata

CVE ID: CVE-2019-13206

CVSS v3 Score: 8.8 (HIGH)

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE: CWE-120

Published: March 13, 2020

Last Updated: November 21, 2024

🔗 References

https://www.nccgroup.trust/us/our-research/technical-advisory-multiple-vulnerabilities-in-kyocera-printers/ Third Party Advisory
https://www.nccgroup.trust/us/our-research/technical-advisory-multiple-vulnerabilities-in-kyocera-printers/ Third Party Advisory

📤 Share & Export

📄 Export Markdown 📋 Export JSON

🔗 Related Vulnerabilities

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