A vulnerability, which was classified as critical, has been found in GrandNode 4.40. This issue affects the function LetsEncryptController of the file Controllers/LetsEncryptController.cs. The manipulation as part of a HTTP Requests leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

A Path Traversal vulnerability in Controllers/LetsEncryptController.cs in LetsEncryptController in GrandNode 4.40 allows remote, unauthenticated attackers to retrieve arbitrary files on the web server via specially crafted LetsEncrypt/Index?fileName= HTTP requests. A patch for this issue was made on 2019-05-30 in GrandNode 4.40.

The weakness was shared 06/05/2019. The identification of this vulnerability is CVE-2019-12276 since 05/22/2019. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

Applying a patch is able to eliminate this problem.

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• GrandNode

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• 4.40

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• 🔍

CPE 2.2info

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