CVE-2011-1890 in SharePoint Foundation
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in EditForm.aspx in Microsoft Office SharePoint Server 2010 and SharePoint Foundation 2010 allows remote attackers to inject arbitrary web script or HTML via a post, aka "Editform Script Injection Vulnerability."
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Analysis
by VulDB Data Team • 11/18/2021
The CVE-2011-1890 vulnerability represents a critical cross-site scripting flaw in Microsoft Office SharePoint Server 2010 and SharePoint Foundation 2010 platforms. This vulnerability specifically affects the EditForm.aspx component, which serves as a fundamental interface for users to modify content within SharePoint environments. The flaw enables remote attackers to inject malicious web scripts or HTML code through POST requests, creating a significant security risk for organizations relying on these platforms for collaborative document management and content sharing.
The technical nature of this vulnerability stems from insufficient input validation and output encoding within the EditForm.aspx page. When users submit data through the edit form interface, the application fails to properly sanitize user inputs before rendering them back to the browser. This allows attackers to craft malicious payloads that exploit the lack of proper sanitization mechanisms, enabling the execution of arbitrary scripts in the context of the victim's browser session. The vulnerability is classified under CWE-79 as a failure to sanitize user inputs, making it a classic cross-site scripting vulnerability that can be leveraged for session hijacking, data theft, or further exploitation of the SharePoint environment.
The operational impact of this vulnerability extends beyond simple script injection, as it provides attackers with a potential foothold for more sophisticated attacks within the SharePoint ecosystem. An attacker who successfully exploits this vulnerability could execute scripts in the context of authenticated users, potentially gaining access to sensitive documents, modifying content, or even escalating privileges within the SharePoint environment. This risk is particularly severe in enterprise settings where SharePoint servers often contain confidential business information, employee data, and proprietary documents. The vulnerability affects all versions of SharePoint Server 2010 and SharePoint Foundation 2010, making it a widespread concern for organizations that have not yet migrated to newer versions.
Organizations affected by this vulnerability should implement immediate mitigations including applying the relevant Microsoft security patches, implementing proper input validation mechanisms, and configuring appropriate web application firewalls to detect and block malicious payloads. The vulnerability aligns with ATT&CK technique T1566.001 for initial access through malicious web content, and can be leveraged for persistent access through session manipulation and credential theft. Additionally, implementing content security policies and ensuring proper output encoding in all SharePoint forms can significantly reduce the attack surface. Regular security assessments and penetration testing should be conducted to identify similar vulnerabilities in custom SharePoint applications and third-party integrations that may also be susceptible to cross-site scripting attacks.