CVE-2024-56159 Scanner

Astro is a popular framework for building web applications, favored by developers for its simplicity and performance. It is widely used in the creation of static sites, dynamic applications, and server-side rendered apps. Astro integrates well with various JavaScript libraries and frameworks, providing flexibility and extensibility. The framework has a vibrant community and is supported by regular updates and active security practices. As it removes JavaScript from the client-side runtime, it enhances performance but relies heavily on its configuration by users for successful builds. Ensuring secure and optimal configuration of Astro is crucial for maintaining its integrity in web development environments.

The Information Disclosure vulnerability in Astro arises when sourcemaps are enabled, inadvertently exposing source code. This flaw is present in Astro versions v5.0.3 through v5.0.7 and v4.16.17 or older, where sourcemap files are publicly accessible in the build output directory. Access to these files could allow unauthorized individuals to view the server's source code. This exposure becomes a significant security risk as it might reveal additional vulnerabilities or sensitive information embedded within the code. The vulnerability is exacerbated by leaving sourcemaps enabled in production environments.

The vulnerability occurs because sourcemap files, which map minified code to source code, are not protected, leaving them accessible on the server. Affected paths like '/pages/index.astro.mjs.map' and '/index.astro.mjs.map' hold essential source mappings. An HTTP GET request to these URIs may return 200 OK, indicating the presence and accessibility of such files. The inclusion of terms like "version", "sources", and "sourcesContent" within these files confirms their purpose and authenticity. This misconfiguration leads to inadvertent transparency of potentially sensitive source code files.

Exploiting this vulnerability could have serious consequences, allowing attackers to inspect the underlying source code and identify additional weaknesses. The insight gained can be used to craft further exploits or gain unauthorized access. Such an exposure increases the risk of other vulnerabilities being uncovered and potentially exploited by malicious entities. It may lead to the unauthorized acquisition of sensitive data, or even facilitate a path for remote code execution if other exploitable paths are identified.

REFERENCES

• https://github.com/withastro/astro/security/advisories/GHSA-49w6-73cw-chjr
• https://nvd.nist.gov/vuln/detail/CVE-2024-56159