Caucho Resin Local File Inclusion Scanner

Caucho Resin is a Java application server used by companies and developers for hosting web applications. It is widely adopted due to its scalability, reliability, and support for both Java EE and microservices architectures. Typically, developers utilize Caucho Resin in environments that require efficient and robust server capabilities, as well as support for various Java EE technologies. As such, it plays a crucial role in serving dynamic web content and enabling enterprise-level applications. Due to its wide adoption, any security issues within Caucho Resin can have significant implications for web applications and services worldwide.

The Local File Inclusion (LFI) vulnerability in Caucho Resin allows remote unauthenticated users to read files on the server by manipulating input variables. This type of vulnerability poses a serious security risk as it could lead to unauthorized data access. Attackers might use this vulnerability to disclose sensitive information, which can further aid in devising more sophisticated attacks. The vulnerability results from improper validation of input parameters, allowing attackers to traverse directory paths and access arbitrary files on the system. The availability of this vulnerability in Caucho Resin systems necessitates urgent attention to mitigate potential security breaches.

This specific LFI vulnerability in Caucho Resin involves the 'inputFile' parameter, which allows users to request local files on the system. Attackers exploit this parameter by injecting directory traversal sequences to point to files of interest, such as configuration or data files. The endpoint vulnerable to this attack is the '/resin-doc/resource/tutorial/jndi-appconfig/test' endpoint, where attackers manipulate the 'inputFile' variable. By doing so, they can successfully include and read contents of local files on the victim server. The server processes these unauthorized requests without appropriate checks, exposing sensitive information.

Exploitation of the Local File Inclusion vulnerability might lead to unauthorized access to sensitive data stored on the server. Attackers can leverage disclosed data to perform further attacks, such as crafting targeted exploits based on configuration files. This access could expose proprietary or confidential information, potentially resulting in data breaches. Furthermore, the vulnerability could be a stepping stone for escalating attacks, including remote code execution, if exploited in conjunction with other vulnerabilities.

REFERENCES

• https://blkstone.github.io/2017/10/30/resin-attack-vectors/