CVE-2022-3429 in Printer GM265DN
Summary
by MITRE • 10/27/2023
A denial-of-service vulnerability was found in the firmware used in Lenovo printers, where users send illegal or malformed strings to an open port, triggering a denial of service that causes a display error and prevents the printer from functioning properly.
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Analysis
by VulDB Data Team • 10/27/2023
This vulnerability represents a critical denial-of-service flaw in Lenovo printer firmware that demonstrates the intersection of network protocol handling and embedded system security. The issue manifests when malicious actors send specially crafted malformed strings to open network ports on affected printer models, causing the device to enter a state where it displays error messages and becomes completely non-functional. This type of vulnerability directly impacts the availability aspect of the CIA triad and represents a classic example of insufficient input validation in embedded network services. The vulnerability affects the printer's ability to process legitimate print jobs and maintain operational integrity, effectively rendering the device unusable until manual intervention or power cycling occurs.
The technical implementation of this flaw stems from inadequate string parsing and validation mechanisms within the printer's firmware network stack. When the firmware receives malformed input through open ports, it fails to properly sanitize or reject the malformed data, leading to an unhandled exception or buffer overflow condition that crashes the printer's operating system or core services. This behavior aligns with common software vulnerabilities classified under CWE-129, which deals with insufficient validation of length of input buffers, and CWE-707, which addresses improper handling of potentially malicious input. The vulnerability exploits the fundamental weakness in how the embedded system processes external network communications without proper defensive programming practices.
From an operational perspective, this vulnerability creates significant business continuity risks for organizations relying on Lenovo printers, particularly in enterprise environments where printer availability is crucial for document workflows. The impact extends beyond simple service disruption as it can affect multiple users simultaneously if the affected printer serves a shared network location. Attackers can exploit this vulnerability with minimal technical expertise, making it particularly dangerous in unsecured network environments where printers may be accessible from external networks. The vulnerability also represents a potential vector for broader network attacks, as compromised printers can serve as stepping stones for lateral movement within corporate networks, aligning with ATT&CK technique T1071.004 for application layer protocol tunneling and T1499.004 for network disruption.
Mitigation strategies should focus on network segmentation and access control to prevent unauthorized access to printer network ports, including implementing firewall rules to restrict access to printer management interfaces. Organizations should also ensure firmware updates are applied promptly, as Lenovo has released patches addressing this specific vulnerability. Network monitoring solutions can help detect anomalous traffic patterns that may indicate exploitation attempts, while regular vulnerability assessments should include embedded device scanning to identify potentially affected printers. The remediation process must also consider the printer's role in business processes, ensuring that alternative printing solutions are available during remediation periods, and implementing proper network access controls to prevent unauthorized users from accessing printer services directly.