CVE-2012-3997 in Sticky Notes
Summary
by MITRE
Multiple cross-site scripting (XSS) vulnerabilities in Sticky Notes before 0.2.27052012.5 allow remote attackers to inject arbitrary web script or HTML via the (1) paste_user or (2) paste_lang parameter to (a) list.php or (b) show.php.
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Analysis
by VulDB Data Team • 12/06/2021
The vulnerability described in CVE-2012-3997 represents a critical cross-site scripting weakness affecting the Sticky Notes application version prior to 0.2.27052012.5. This flaw exists within the web application's input validation mechanisms, specifically in how it processes user-supplied data through HTTP parameters. The vulnerability manifests in two primary attack vectors where malicious actors can inject harmful scripts into the application's response, potentially compromising user sessions and data integrity. The affected parameters paste_user and paste_lang in the list.php and show.php scripts create pathways for attackers to execute unauthorized code within the context of other users' browsers.
The technical implementation of this vulnerability stems from insufficient sanitization of user inputs before rendering them in web responses. When the application processes the paste_user and paste_lang parameters without proper validation or encoding, it fails to distinguish between legitimate content and malicious script code. This lack of input filtering creates an environment where attackers can embed javascript payloads or HTML code that executes when other users view the affected pages. The vulnerability is classified as a classic reflected XSS attack where the malicious payload is embedded in the URL or form data and then reflected back to the user's browser. According to CWE classification, this represents a CWE-79: Improper Neutralization of Input During Web Page Generation, which is a fundamental web application security weakness. The vulnerability's impact aligns with ATT&CK technique T1566.001: Phishing, as it enables attackers to craft malicious web pages that can harvest user credentials or perform unauthorized actions on behalf of victims.
The operational implications of this vulnerability extend beyond simple script injection, as it can lead to session hijacking, credential theft, and unauthorized access to user data. Attackers leveraging this vulnerability can potentially redirect users to malicious sites, steal cookies, or inject additional malicious code that persists across user sessions. The affected application's architecture appears to lack proper output encoding mechanisms that would neutralize potentially dangerous characters in user-supplied data. This weakness particularly impacts users who interact with the sticky notes functionality, as any content shared through the paste_user or paste_lang parameters becomes a potential attack surface. The vulnerability is especially concerning because it affects core application functionality where users expect to share information, making it difficult to implement effective user education-based mitigations. Organizations relying on this application face significant risk of data breaches and unauthorized access, particularly in environments where users may not be security-aware.
Mitigation strategies for this vulnerability require immediate implementation of proper input validation and output encoding mechanisms. The application must sanitize all user-supplied parameters before processing them, implementing strict whitelisting approaches for acceptable input characters and values. The most effective remediation involves applying context-specific encoding to all output rendered to web pages, particularly when displaying user-generated content. Security patches should enforce proper parameter validation in both list.php and show.php scripts, ensuring that paste_user and paste_lang parameters undergo rigorous sanitization before being incorporated into HTML responses. Organizations should also implement content security policies to prevent unauthorized script execution and consider deploying web application firewalls to detect and block malicious payloads. The vulnerability's resolution should include comprehensive testing to verify that all input parameters are properly validated and that output encoding prevents script injection regardless of the data type or format provided by users. Additionally, regular security assessments should be conducted to identify similar input validation weaknesses in other application components, as this vulnerability demonstrates the importance of consistent security practices throughout the application lifecycle.