CVE-2022-43140 Scanner

kkFileView is a versatile file preview and conversion tool designed for integration with web applications. It supports a wide range of file formats, allowing users to view documents, images, and videos directly in their web browser without needing to download or open them in external applications. The software is particularly useful for content management systems, document sharing platforms, and collaborative environments where quick and easy access to various file types is essential. Developed by Keking, kkFileView is popular among developers and organizations looking to enhance their web applications with rich document viewing capabilities.

In version 4.1.0 of kkFileView, a critical Server-Side Request Forgery (SSRF) vulnerability exists. This flaw allows attackers to send crafted requests from the server to internal or external resources. Exploiting this vulnerability, attackers can bypass security mechanisms to access restricted internal services, conduct port scanning, and potentially access sensitive information. The vulnerability stems from inadequate validation of user-supplied URLs, specifically within the OnlinePreviewController#getCorsFile component, where an attacker can manipulate the URL parameter to initiate unauthorized requests.

The SSRF vulnerability in kkFileView 4.1.0 arises from the application's handling of the `urlPath` parameter in the `getCorsFile` method. By encoding a malicious URL in Base64 and passing it as the `urlPath` parameter, an attacker can coerce the server into making arbitrary HTTP requests to internal or external resources. This behavior can be exploited to interact with services that are only accessible from the server's internal network, leading to information disclosure, internal network mapping, or further exploitation of internal vulnerabilities.

The potential impacts of exploiting this SSRF vulnerability include unauthorized access to internal network services, data exfiltration, and leveraging the server's trust relationship to conduct further attacks. Additionally, this vulnerability could be used as a stepping stone for more severe attacks, such as remote code execution, depending on the configuration and security measures in place on the internal network.

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References

• https://github.com/kekingcn/kkFileView/issues/392
• https://nvd.nist.gov/vuln/detail/CVE-2022-43140