CVE-2012-5174 in Xw300k
Summary
by MITRE
The KYOCERA AH-K3001V, AH-K3002V, WX300K, WX310K, WX320K, and WX320KR devices allow remote attackers to cause a denial of service (persistent reboot) via an e-mail message in an invalid format.
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Analysis
by VulDB Data Team • 03/16/2019
The CVE-2012-5174 vulnerability affects several KYOCERA multifunction printer models including the AH-K3001V, AH-K3002V, WX300K, WX310K, WX320K, and WX320KR devices. This vulnerability represents a significant security flaw in the email processing functionality of these networked printing devices, which are commonly deployed in enterprise environments where reliable document management is critical. The affected devices are designed to receive and process email messages for print jobs, making them potential entry points for malicious actors seeking to disrupt business operations through service disruption attacks.
The technical flaw in this vulnerability stems from inadequate input validation within the email processing subsystem of the KYOCERA devices. When these printers receive email messages with invalid formatting, the device fails to properly handle the malformed data structure, resulting in a persistent reboot cycle that can continue indefinitely until manual intervention occurs. This represents a classic buffer overflow or parsing error condition where the device's email parser does not implement proper error handling mechanisms to gracefully manage malformed input data. The vulnerability specifically manifests when the device attempts to parse email headers, attachments, or message bodies that do not conform to expected email standards, causing the system to crash and restart repeatedly.
The operational impact of CVE-2012-5174 extends beyond simple service disruption to create substantial business continuity issues for organizations relying on these devices. Persistent reboots can occur multiple times per hour, effectively rendering the affected printers unusable for legitimate print jobs and potentially causing significant delays in document processing workflows. In enterprise environments where these devices serve as central print servers for multiple users or departments, the impact can cascade across the entire organization, affecting productivity and potentially leading to costly downtime. The vulnerability also creates a potential attack vector for persistent denial of service attacks that can be difficult to detect and remediate, as the reboot cycle may mask other security issues or make network monitoring more challenging.
From a cybersecurity perspective, this vulnerability aligns with CWE-129, which addresses improper validation of input boundaries, and represents a failure in implementing robust input sanitization and error handling procedures. The attack pattern follows ATT&CK technique T1499.004 for network denial of service, where adversaries target network infrastructure to disrupt services. Organizations should implement immediate mitigations including network segmentation to isolate affected devices from critical network segments, implementing email filtering solutions that can detect and block malformed email traffic before it reaches the printers, and establishing monitoring procedures to detect persistent reboot patterns. Additionally, the vulnerability highlights the importance of firmware updates and regular security assessments of networked devices, as the affected KYOCERA models should have received security patches addressing this specific parsing vulnerability. The incident underscores the need for comprehensive security testing of email processing capabilities in networked devices and proper implementation of defensive measures such as input validation, error handling, and system resilience mechanisms to prevent similar vulnerabilities from affecting other network infrastructure components.