Sharp Multifunction Printers Local File Inclusion Scanner

Sharp Multifunction Printers are widely used in offices and industries for reliable and efficient printing, scanning, and copying solutions. They are renowned for integrating advanced features that facilitate document management and secure printing. Enterprises and government institutions often adopt these printers due to their capacity to handle large volumes of document processing. The printers support various network configurations, making them a versatile choice for different organizational environments. Sharp consistently updates their software to ensure robust security and user management features. With remote monitoring and maintenance capabilities, these printers ensure minimal downtime in critical operations.

Local File Inclusion (LFI) is a security vulnerability that allows attackers to include files from the targeted server into the output. The vulnerability arises when user input is not properly validated and used in file inclusion paths by the server. It can lead to sensitive data disclosure such as server configurations, user credentials, and critical application data. Attackers can exploit LFI to execute scripts and manipulate server configurations. The vulnerability is particularly critical as it may expose internal workings of the server to external entities. Adequate input validation and error handling are essential to mitigate such vulnerabilities.

The Sharp Multifunction Printers are susceptible to LFI through a specific endpoint used for manual file downloads. The vulnerability arises due to improper handling of the 'path' parameter in the 'installed_emanual_down.html' endpoint. By exploiting the directory traversal sequences in the URL, attackers can access sensitive files like '/etc/passwd'. This endpoint's lack of authentication checks further escalates the risk, allowing unauthenticated individuals to obtain unrestricted access to file directories. The response headers indicating 'application/octet-stream; name=passwd' confirm the presence of the vulnerability when successful exploitation occurs. Addressing this involves scrutinizing input queries and utilizing whitelisting strategies for file paths.

When exploited, the Local File Inclusion vulnerability in Sharp Multifunction Printers can lead to significant data breaches. Unauthorized access to sensitive files could lead to a broader compromise of internal networks and exfiltration of confidential information. In some cases, this may facilitate further intrusion attempts to execute payloads that modify printer configurations or disrupt standard operational functions. Given the widespread usage of these printers, compromised devices might serve as pivot points for attackers to infiltrate connected networks. The security implications extend beyond individual data breaches as they may lead to substantial reputational and financial damages.

REFERENCES

• https://pierrekim.github.io/blog/2024-06-27-sharp-mfp-17-vulnerabilities.html#pre-auth-lfi
• https://jvn.jp/en/vu/JVNVU93051062/index.html
• https://global.sharp/products/copier/info/info_security_2024-05.html