CVE-2003-1243 in Sage
Summary
by MITRE
Cross-site scripting vulnerability (XSS) in Sage 1.0 b3 allows remote attackers to insert arbitrary HTML or web script via the mod parameter.
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Analysis
by VulDB Data Team • 07/15/2025
The vulnerability identified as CVE-2003-1243 represents a classic cross-site scripting flaw in the Sage content management system version 1.0 beta 3. This particular weakness resides in how the application processes the mod parameter within its web interface, creating an avenue for malicious actors to inject arbitrary HTML or JavaScript code into web pages viewed by other users. The vulnerability classification aligns with CWE-79 which specifically addresses Improper Neutralization of Input During Web Page Generation, commonly known as cross-site scripting. The flaw demonstrates the fundamental principle that user-supplied input must be properly validated and sanitized before being incorporated into web page output to prevent execution of malicious code in the context of a victim's browser session.
The technical exploitation of this vulnerability occurs when an attacker crafts a malicious URL containing crafted script code within the mod parameter value. When a victim accesses this specially crafted link, the Sage application fails to properly escape or filter the input before rendering it in the web interface. This allows the injected script to execute within the victim's browser context, potentially leading to session hijacking, credential theft, or redirection to malicious websites. The vulnerability operates under the ATT&CK framework's technique T1566 which describes the use of malicious links to deliver payloads, and specifically targets the web application layer where user input is processed without adequate sanitization measures.
The operational impact of this vulnerability extends beyond simple script injection as it can enable sophisticated attack vectors including session fixation, cookie theft through document.cookie access, and redirection to phishing sites that can harvest user credentials. Attackers can leverage this flaw to impersonate legitimate users within the Sage application, potentially gaining unauthorized access to administrative functions or sensitive content management capabilities. The vulnerability affects any user who views the compromised page, making it particularly dangerous in environments where multiple users interact with the same Sage application. The attack requires no special privileges or authentication, making it an easy target for automated exploitation tools and increasing the likelihood of successful compromise.
Mitigation strategies for CVE-2003-1243 should focus on implementing proper input validation and output encoding mechanisms. The primary defense involves sanitizing all user-supplied input through proper escaping of special characters before rendering them in web pages. This includes implementing a whitelist-based approach for parameter validation or using established encoding libraries to neutralize potentially harmful characters. Organizations should also implement Content Security Policy headers to limit script execution and prevent unauthorized code injection. The vulnerability highlights the importance of input validation as a fundamental security control, aligning with security frameworks such as OWASP Top Ten which consistently ranks input validation failures as critical security risks. Regular security updates and patch management are essential as this vulnerability was likely addressed in subsequent versions of the Sage application through proper input sanitization and parameter handling mechanisms.