CVE-2011-4161 in Laserjet M9040
Summary
by MITRE
The default configuration of the HP CM8060 Color MFP with Edgeline; Color LaserJet 3xxx, 4xxx, 5550, 9500, CMxxxx, CPxxxx, and Enterprise CPxxxx; Digital Sender 9200c and 9250c; LaserJet 4xxx, 5200, 90xx, Mxxxx, and Pxxxx; and LaserJet Enterprise 500 color M551, 600, M4555 MFP, and P3015 enables the Remote Firmware Update (RFU) setting, which allows remote attackers to execute arbitrary code by using a session on TCP port 9100 to upload a crafted firmware update.
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Analysis
by VulDB Data Team • 01/05/2025
The vulnerability identified as CVE-2011-4161 affects a wide range of HP multifunction printers and laser printers including models from the CM8060 Color MFP series, various Color LaserJet 3xxx, 4xxx, 5550, 9500, CMxxxx, CPxxxx, and Enterprise CPxxxx series, Digital Sender 9200c and 9250c devices, LaserJet 4xxx, 5200, 90xx, Mxxxx, and Pxxxx series, as well as LaserJet Enterprise 500 color M551, 600, M4555 MFP, and P3015 printers. This vulnerability stems from the default configuration of these devices where the Remote Firmware Update (RFU) functionality remains enabled, creating a significant security exposure that can be exploited by remote attackers without requiring authentication or specialized privileges. The flaw specifically resides in the printer's network service implementation that accepts connections on TCP port 9100, which is the standard port used for printer communication and raw printing protocols.
The technical exploitation of this vulnerability occurs through a carefully crafted firmware update file that is uploaded to the affected devices via TCP port 9100. This port typically handles raw printer data and is commonly used for direct printer communication in network environments. Attackers can leverage this default configuration to establish a session on TCP port 9100 and then upload malicious firmware that, when executed, allows arbitrary code execution on the affected printer systems. This represents a critical security flaw because it enables attackers to gain persistent control over the printer's operating system and potentially use the compromised device as a foothold for further network infiltration. The vulnerability essentially transforms a legitimate printer management function into a vector for remote code execution, bypassing traditional authentication mechanisms that should normally protect such sensitive operations.
The operational impact of this vulnerability extends beyond simple unauthorized access to represent a comprehensive compromise of network security infrastructure. Compromised printers can serve as entry points for attackers to gain access to internal networks, especially in environments where printers are connected to sensitive network segments or where they have access to network resources. The remote code execution capability allows attackers to install backdoors, modify printer configurations, redirect print jobs, or even use the compromised devices as relay points for attacks against other network systems. This vulnerability particularly affects enterprise environments where multiple printers are deployed, as it can provide attackers with a scalable vector for network infiltration. The default enablement of RFU functionality means that organizations may unknowingly expose their printer fleet to this risk, creating a persistent security threat that can be exploited by adversaries with minimal technical skill or resources.
Organizations should immediately disable the Remote Firmware Update functionality on affected devices through proper configuration management procedures, ensuring that the RFU setting is disabled in the printer's network configuration interface. The recommended mitigation involves accessing the printer's web-based management interface or using command-line tools to disable the RFU feature, which should be done as part of routine security maintenance procedures. Network segmentation should be implemented to isolate printer networks from critical business systems, and firewall rules should be configured to block access to TCP port 9100 from unauthorized network segments. Additionally, organizations should conduct comprehensive inventory audits to identify all affected devices and ensure that firmware updates are applied to address the underlying vulnerability. This vulnerability aligns with CWE-284, which addresses improper access control in network services, and maps to ATT&CK technique T1072, which covers software deployment and execution through network services. Regular security assessments and vulnerability scanning should be performed to ensure that similar misconfigurations are not present in other network devices, as this represents a common pattern of security flaws in enterprise printer fleet management where default configurations are not properly reviewed and hardened.