Microsoft SharePoint Master Page Exposure Scanner

Microsoft SharePoint is a versatile web-based collaboration platform used by organizations of various sizes to manage content, documents, and business processes efficiently. It is employed across different sectors to facilitate document management, team collaboration, and internal communication. SharePoint offers features such as integration with Microsoft Office, robust search capabilities, and customizable workflows. Organizations use SharePoint to create websites, store and share information, and manage projects. Its deployment ranges from small teams using SharePoint Online in Office 365 to large enterprises with on-premises installations. SharePoint is prized for its ability to enhance organizational productivity and streamline workflows.

The vulnerability detected in this scanner pertains to an exposure issue within Microsoft SharePoint, specifically involving the Master Page endpoints. Vulnerable endpoints could potentially reveal sensitive details about the site's configuration, structure, or internal workings. Attackers might exploit this exposure to gather information that can be leveraged in more sophisticated intrusion attempts. The exposure vulnerability typically exists due to misconfigured settings that unintentionally allow unauthorized access. Organizations may inadvertently expose internal URLs that lead to confidential resources. Addressing this exposure is crucial to securing SharePoint installations from potential abuse.

Technical details of this vulnerability include the exposure of the Master Page Gallery endpoints within SharePoint. The vulnerable parameter involves endpoints like `/_catalogs/masterpage/Forms/AllItems.aspx` which are not adequately secured against unauthorized access. Attackers can access these pages to gather data about the SharePoint site's structure and design elements. The presence of HTTP status code 200 alongside specific page content identifiers like "Master Page Gallery" and "Recycle" confirms the exposure. This technical setup could be exploited to identify possible entry points or weaknesses in the site's architecture.

When this vulnerability is exploited by malicious individuals, several negative effects may ensue. Attackers could gain insights into the site's layout, making it easier to tailor targeted attacks. They may craft phishing campaigns or deploy social engineering tactics using the gathered information. There is also the risk that exposed pages might contain sensitive information inadvertently included within the master pages. If attackers identify other weaknesses or vulnerabilities based on this exposure, it could lead to more significant breaches or data exfiltration. Ultimately, the exposure undermines organizational security and can lead to unauthorized data access.

REFERENCES

• https://sharepointstuff.com/2021/03/30/useful-sharepoint-urls/