CNVD-2020-26585 Scanner

Showdoc is a widely-used online API and technical documentation tool, servicing IT teams for creating and managing documentation efficiently. Often adopted in corporate environments, it aids in structuring and sharing project details seamlessly across several teams and departments. The platform supports collaborative documentation, thus accelerating the documentation process and project turnaround. Significant for its ease of use and integration capabilities, Showdoc is favored by teams requiring methodical documentation processes. Notably, it helps maintain consistency and accessibility in documentation, a critical aspect for distributed teams. Recognized for its accessible syntax and straightforward interface, it is a preferred choice for technical teams worldwide.

The unrestricted file upload vulnerability in Showdoc arises from inadequate validation of file types, allowing attackers to upload malicious files. This vulnerability potentially exposes server resources, leading to unauthorized access and server compromise. Understanding its critical nature, the flaw permits attackers to utilize exploitational payloads, compromising data integrity. The severity is underscored by its potential to facilitate further intrusion activities, posing a significant risk to data confidentiality and integrity. It threatens the availability of services hosted by vulnerable servers, thus requiring immediate attention and patching. Persistent exposure to this vulnerability may result in substantial security breaches and exploitation risks across affected systems.

The vulnerability primarily targets Showdoc versions below 2.8.6, affecting its file upload component. Exploiting this involves crafting HTTP requests capable of uploading arbitrary files, owing to insufficient input validation. By not properly checking the MIME types or file extensions during upload, attackers can deploy executable scripts or backdoor files. The associated endpoints within the application’s upload function are targeted, enabling file execution post-upload. Technical examination reveals that uploading files with double extensions or obfuscated formats bypasses existing safeguards. Consequently, uploaded files may be accessed and executed, facilitating unauthorized server command execution. The vulnerability underscores the need for robust validation mechanisms on file uploads.

If exploited, the unrestricted file upload vulnerability could allow attackers to execute arbitrary code on the server. This might lead to data breaches, deployment of ransomware, or server hijacking. It can result in unauthorized administrative access and expose sensitive data, culminating in severe financial and reputational damage to organizations. Persistent exploitation can precipitate full system control allocation to malicious entities, enabling data extraction or system destruction. Given the potential scale of impact, businesses may face prolonged downtime and restoration challenges post-exploit. Further, it poses risk to other applications interfacing with the compromised server, escalating the security threat across networks.

REFERENCES

• https://vul.wangan.com/a/CNVD-2020-26585
• https://blog.csdn.net/qq_48985780/article/details/122211136
• https://github.com/star7th/showdoc/pull/1059