CVE-2023-0858 in LBP660C
Summary
by MITRE • 05/11/2023
Improper Authentication of RemoteUI of Office / Small Office Multifunction Printers and Laser Printers(*) which may allow an attacker on the network segment to trigger unauthorized access to the product. *:Satera LBP660C Series/LBP620C Series/MF740C Series/MF640C Series firmware Ver.11.04 and earlier sold in Japan. Color imageCLASS LBP660C Series/LBP 620C Series/X LBP1127C/MF740C Series/MF640C Series/X MF1127C firmware Ver.11.04 and earlier sold in US. i-SENSYS LBP660C Series/LBP620C Series/MF740C Series/MF640C Series, C1127P, C1127iF, C1127i firmware Ver.11.04 and earlier sold in Europe.
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Analysis
by VulDB Data Team • 07/12/2025
This vulnerability affects a specific class of multifunction printers and laser printers manufactured by Canon, targeting models including the LBP660C Series, LBP620C Series, MF740C Series, MF640C Series, and related variants sold in Japan, US, and Europe. The affected devices operate with firmware versions 11.04 and earlier, creating a significant security gap in networked printing environments. The vulnerability resides within the RemoteUI component, which serves as the web-based management interface for these devices, enabling administrators to configure and monitor printer settings remotely. This authentication flaw represents a critical weakness in the device's security architecture, as it allows unauthenticated attackers to access the printer's administrative functions without proper credentials. The vulnerability specifically impacts the authentication mechanism of the RemoteUI, which is designed to provide secure access to printer configuration options, firmware updates, and network settings through a web browser interface.
The technical nature of this vulnerability stems from insufficient authentication checks within the RemoteUI functionality, enabling an attacker who has network access to the printer's segment to bypass the normal authentication process. This allows unauthorized access to sensitive printer management features, potentially enabling attackers to modify network configurations, access stored print jobs, change administrative passwords, or even upload malicious firmware updates. The flaw exists in the web server component of the printer's firmware, where authentication tokens or session management mechanisms fail to properly validate user credentials before granting access to administrative functions. According to CWE classification, this vulnerability aligns with CWE-287, which addresses improper authentication issues, and may also relate to CWE-305, indicating inadequate authentication mechanisms. The vulnerability's impact extends beyond simple unauthorized access as it creates a persistent security risk that remains active until firmware updates are applied, potentially allowing attackers to establish long-term access to networked printing environments.
The operational impact of this vulnerability presents significant risks to enterprise and organizational security infrastructure. Attackers who exploit this vulnerability can potentially gain access to sensitive documents passing through these printers, especially in environments where printers are used for confidential business communications or contain personal data. The vulnerability allows attackers to manipulate printer configurations, which could lead to man-in-the-middle attacks, network disruption, or even serve as a stepping stone for broader network infiltration. In large organizations with multiple affected printers, this vulnerability could enable attackers to establish persistent access points within the network, particularly if these printers are not properly segmented from critical systems. The attack surface is further expanded as these devices are often accessible from multiple network segments, making them attractive targets for lateral movement within enterprise networks. According to ATT&CK framework, this vulnerability maps to T1071.004 for application layer protocol usage and T1082 for system information discovery, as attackers could use the compromised printers to gather network information or establish persistent access. The risk is particularly elevated in environments where printers are not properly secured or monitored, as these devices often remain accessible to all network users without proper access controls.
Organizations should immediately implement mitigations including firmware updates from Canon to address the authentication flaw, network segmentation to isolate affected printers from critical systems, and enhanced monitoring of printer network traffic for suspicious activities. Network administrators should also consider disabling unnecessary services and ports on affected devices, particularly the RemoteUI web interface if it is not essential for operations. Additional mitigations include implementing strong network access controls, regularly reviewing printer access logs, and conducting security assessments to identify other potentially vulnerable devices within the network. The vulnerability highlights the importance of securing Internet of Things devices and networked peripherals, as these devices often receive less security attention than core network infrastructure components. Organizations should also consider implementing network intrusion detection systems to monitor for exploitation attempts and establish incident response procedures for handling printer-related security incidents. Regular security updates and patch management processes should be extended to include all networked devices, including printers, copiers, and other peripheral equipment, to prevent similar vulnerabilities from being exploited in the future.