Discuz! milu-seotool Plugin Local File Inclusion Scanner

Discuz! is a widely used community forum software system, known for its flexibility and ease of use. It is popular among online communities and forums, allowing users to create, manage, and participate in discussions. The software supports a variety of plugins to enhance its functionality, including the milu_seotool plugin. This plugin is designed to assist with search engine optimization (SEO) tasks within the Discuz! platform. It is commonly used by webmasters and forum administrators to improve the visibility and search ranking of their forums. However, the software and its plugins must be maintained regularly to ensure security and optimal performance.

The Local File Inclusion (LFI) vulnerability in the Discuz! milu_seotool plugin can allow attackers to include local files on the server. This type of vulnerability often arises when file paths are not properly validated or sanitized. An attacker can exploit LFI by manipulating input parameters to include unauthorized files. This can lead to the exposure of sensitive information or execution of unintended code on the server. The risk is significant, as LFI can sometimes be escalated to Remote Code Execution (RCE) if certain conditions are met. Ensuring proper input validation and file access controls is crucial in preventing such vulnerabilities.

The vulnerability in the Discuz! milu_seotool plugin is primarily located at the endpoint that handles plugin requests, specifically through the 'id' parameter. This parameter can be exploited by appending a file path that eventually leads to the inclusion of non-permitted files. This occurs due to insufficient path validation, allowing attackers to perform a directory traversal attack. The issue is exacerbated if the server configuration allows null byte truncation, which can bypass certain file path restrictions. Proper server configuration and regular updates can mitigate the impact of this vulnerability.

If exploited, this vulnerability can have severe consequences, including unauthorized access to sensitive files on the server. Attackers may be able to execute arbitrary code by including scripts present on the server. Data leakage, defacement, or complete system compromise are possible outcomes. The server's integrity and the confidentiality of stored information can be undermined. It could also allow attackers to escalate privileges and conduct further attacks using the compromised server as a pivot point.

REFERENCES

• http://discuz.net/