CVE-2013-1393 in CurvyCorners
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in the CurvyCorners module 6.x-1.x and 7.x-1.x for Drupal allows remote authenticated users with the "administer curvycorners" permission to inject arbitrary web script or HTML via unspecified vectors.
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Analysis
by VulDB Data Team • 01/03/2022
The CVE-2013-1393 vulnerability represents a critical cross-site scripting flaw within the CurvyCorners module for Drupal platforms version 6.x-1.x and 7.x-1.x. This vulnerability specifically targets authenticated users who possess the administrative permission to manage curvycorners settings, creating a significant security risk for Drupal websites that utilize this module. The flaw allows attackers to inject malicious scripts or HTML code through unspecified vectors, potentially compromising the integrity of the web application and user data.
The technical implementation of this vulnerability stems from inadequate input validation and output sanitization within the CurvyCorners module's administrative interface. When authenticated users with the appropriate permissions attempt to configure or modify curvycorners settings, the module fails to properly sanitize user-supplied input before rendering it in the web page context. This oversight creates an opening for malicious actors to execute arbitrary JavaScript code within the browser context of other users who access the affected administrative pages. The vulnerability operates under the Common Weakness Enumeration classification of CWE-79, which specifically addresses Cross-Site Scripting flaws in web applications. This weakness category encompasses various forms of XSS attacks where untrusted data is improperly handled during web page generation, leading to potential code execution in user browsers.
The operational impact of this vulnerability extends beyond simple script injection, as it provides attackers with the capability to perform session hijacking, steal sensitive information, and potentially escalate privileges within the Drupal environment. An attacker with the "administer curvycorners" permission can craft malicious input that executes when other administrators view the curvycorners configuration pages, leading to persistent XSS attacks that can compromise multiple user sessions. The attack vector operates through the standard web application request-response cycle, where malicious input is accepted during form submission and subsequently rendered without proper sanitization. This vulnerability directly aligns with ATT&CK technique T1059.007, which covers Scripting through web shells, as the injected code can be used to establish persistent access or execute additional malicious commands within the compromised environment.
Organizations affected by this vulnerability should immediately implement several mitigation strategies to protect their Drupal installations. The primary recommendation involves upgrading to the latest version of the CurvyCorners module where the XSS vulnerability has been patched and properly addressed. Additionally, administrators should consider implementing proper input validation measures and output encoding mechanisms within their Drupal configurations, ensuring that all user-supplied data undergoes rigorous sanitization before being processed or displayed. Network segmentation and privilege minimization practices should be enforced to limit the scope of potential exploitation, reducing the risk of attackers obtaining the necessary administrative permissions to leverage this vulnerability. Regular security audits and vulnerability assessments should be conducted to identify and remediate similar weaknesses in other modules and components within the Drupal ecosystem, following the principle of defense in depth to protect against both known and unknown threats.