CVE-2019-14307 in Printer
Summary
by MITRE
Several Ricoh printers have multiple buffer overflows parsing HTTP parameter settings for SNMP, which allow an attacker to cause a denial of service or code execution via crafted requests to the web server. Affected firmware versions depend on the printer models. One affected congiguration is cpe:2.3:o:ricoh:sp_c250dn_firmware:-:*:*:*:*:*:*:* up to (including) 1.06 running on cpe:2.3:o:ricoh:sp_c250dn:-:*:*:*:*:*:*:*, cpe:2.3:o:ricoh:sp_c252dn:-:*:*:*:*:*:*:*. Another affected congiguration is cpe:2.3:o:ricoh:sp_c250sf_firmware:-:*:*:*:*:*:*:* up to (including) 1.12 running on cpe:2.3:o:ricoh:sp_c250sf:-:*:*:*:*:*:*:*, cpe:2.3:o:ricoh:sp_c252sf:-:*:*:*:*:*:*:*.
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Analysis
by VulDB Data Team • 12/04/2023
The vulnerability CVE-2019-14307 represents a critical security flaw in multiple Ricoh printer models that stems from improper handling of HTTP parameter settings during SNMP configuration parsing. This buffer overflow vulnerability exists within the web server component of affected printer firmware, specifically when processing crafted HTTP requests containing malformed SNMP parameters. The flaw allows attackers to exploit memory corruption issues that can lead to either denial of service conditions or arbitrary code execution on the affected devices. These printers operate with embedded web servers that handle configuration updates and network management requests, making them accessible to attackers who can send malicious HTTP requests to manipulate the device's memory structures.
The technical implementation of this vulnerability falls under CWE-121, which describes stack-based buffer overflow conditions, and CWE-787, which covers out-of-bounds write operations. Attackers can craft specially designed HTTP parameter values that exceed the allocated buffer space when the printer's web server parses SNMP configuration settings. The vulnerability manifests during the processing of HTTP requests that contain crafted SNMP parameters, where the printer firmware fails to properly validate input lengths before copying data into fixed-size buffers. This allows attackers to overwrite adjacent memory locations, potentially leading to stack corruption, heap corruption, or control flow hijacking. The specific affected configurations include Ricoh SP C250DN, SP C252DN, SP C250SF, and SP C252SF models with firmware versions up to 1.06 and 1.12 respectively, indicating that the flaw is present in the embedded web server implementation across multiple printer families.
The operational impact of this vulnerability extends beyond simple denial of service to potentially enable complete system compromise. When exploited successfully, attackers can achieve arbitrary code execution on the printer's embedded operating system, which may allow them to install persistent backdoors, exfiltrate sensitive data, or use the compromised printer as a pivot point for attacking internal network resources. The vulnerability's accessibility via HTTP requests makes it particularly dangerous as it can be exploited remotely without requiring physical access to the device. Network-based attacks can originate from any location with access to the printer's network interface, making this vulnerability attractive to threat actors who seek to compromise office environments. The affected devices typically operate in networked environments where they may have access to sensitive corporate data, making the potential for data breaches or lateral movement significant.
Organizations should implement immediate mitigations including network segmentation to isolate affected printers from critical network segments, disabling unnecessary web services on the devices when possible, and applying firmware updates from Ricoh as soon as they become available. The ATT&CK framework categorizes this vulnerability under T1210 - Exploitation of Remote Services, as it involves exploitation of a web server service running on networked devices. Security teams should monitor network traffic for suspicious HTTP requests that contain unusual parameter lengths or malformed SNMP data patterns, which could indicate exploitation attempts. Additionally, implementing network access controls using firewalls to restrict access to printer management interfaces to authorized administrative workstations only provides an additional layer of protection. The vulnerability highlights the importance of securing embedded devices in enterprise environments and demonstrates how seemingly minor flaws in web server implementations can have significant security implications across networked printing infrastructure.