CVE-2022-45796 in MFP
Summary
by MITRE • 12/16/2022
Command injection vulnerability in nw_interface.html in SHARP multifunction printers (MFPs)'s Digital Full-color Multifunctional System 202 or earlier, 120 or earlier, 600 or earlier, 121 or earlier, 500 or earlier, 402 or earlier, 790 or earlier, and Digital Multifunctional System (Monochrome) 200 or earlier, 211 or earlier, 102 or earlier, 453 or earlier, 400 or earlier, 202 or earlier, 602 or earlier, 500 or earlier, 401 or earlier allows remote attackers to execute arbitrary commands via unspecified vectors.
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Analysis
by VulDB Data Team • 07/04/2024
This command injection vulnerability exists within the web interface of SHARP multifunction printers, specifically in the nw_interface.html component of various Digital Full-color and Monochrome Multifunctional Systems. The flaw allows remote attackers to execute arbitrary commands on affected devices without authentication, representing a critical security risk that spans multiple printer models across different product lines. The vulnerability stems from insufficient input validation and sanitization within the network interface configuration page, creating an attack surface where malicious inputs can be interpreted as system commands rather than benign data.
The technical implementation of this vulnerability involves the improper handling of user-supplied parameters within the web application layer of the printer's embedded operating system. Attackers can manipulate input fields through the nw_interface.html page to inject malicious commands that get executed with the privileges of the web server process. This typically occurs when user input is directly concatenated into system command strings without proper escaping or validation mechanisms. The unspecified vectors suggest that multiple input points within the network interface configuration may be susceptible to this injection attack, potentially including parameters related to network settings, DNS configuration, or routing information.
Operationally, this vulnerability poses severe risks to enterprise environments as it enables attackers to gain remote code execution capabilities on network-connected printers. The impact extends beyond simple printer compromise, as these devices often reside within trusted network segments and may have access to sensitive corporate networks. Attackers could leverage this vulnerability to establish persistent access points, perform network reconnaissance, or use the printers as launching platforms for further attacks against other networked systems. The lack of authentication requirements makes this particularly dangerous as it allows exploitation from any network location without prior access credentials.
The vulnerability aligns with CWE-77 and CWE-78 categories from the Common Weakness Enumeration database, specifically addressing command injection flaws where attacker-supplied data is used to construct system commands. From an ATT&CK framework perspective, this maps to techniques such as T1059.001 (Command and Scripting Interpreter: PowerShell) and T1021.001 (Remote Services: Remote Desktop Protocol) when attackers use compromised printers for lateral movement. Organizations should immediately implement network segmentation to isolate printer networks from critical systems and apply firmware updates from SHARP to address this vulnerability. Additionally, network monitoring should be enhanced to detect unusual command execution patterns and unauthorized network configuration changes that may indicate exploitation attempts.
Mitigation strategies include applying the latest firmware patches from SHARP that address the command injection vulnerability, implementing network access controls to restrict remote access to printer management interfaces, and disabling unnecessary network services on affected devices. Security teams should also conduct comprehensive inventory audits to identify all affected printer models and establish monitoring procedures to detect anomalous behavior in printer network traffic. The vulnerability demonstrates the importance of securing Internet of Things devices and embedded systems, as printers often serve as overlooked entry points for cyber attacks. Organizations should consider implementing zero-trust network architectures that verify all device communications regardless of network location or device type, particularly for legacy equipment that may not receive regular security updates.