CVE-2021-40260 in Tailor Management
Summary
by MITRE • 11/09/2021
Multiple Cross Site Scripting (XSS) vulnerabilities exist in SourceCodester Tailor Management 1.0 via the (1) eid parameter in (a) partedit.php and (b) customeredit.php, the (2) id parameter in (a) editmeasurement.php and (b) addpayment.php, and the (3) error parameter in index.php.
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Analysis
by VulDB Data Team • 11/11/2021
The CVE-2021-40260 vulnerability represents a critical cross site scripting flaw affecting SourceCodester Tailor Management version 1.0, a web-based application designed for tailoring business operations. This vulnerability manifests across multiple entry points within the application's interface, specifically targeting parameters that handle user input without proper sanitization or validation mechanisms. The affected parameters include eid in partedit.php and customeredit.php, id in editmeasurement.php and addpayment.php, and error in index.php, indicating a systemic issue in input handling throughout the application's codebase. The vulnerability falls under CWE-79 which specifically addresses Cross-Site Scripting flaws, where improperly validated input is directly reflected back to users without appropriate encoding or sanitization measures.
The technical exploitation of this vulnerability occurs when malicious actors manipulate the targeted parameters to inject malicious javascript code into the application's response. When the application fails to properly sanitize these inputs, the injected scripts execute within the context of other users' browsers who view the affected pages. This creates a persistent threat where attackers can steal session cookies, perform unauthorized actions on behalf of victims, or redirect users to malicious sites. The attack vectors span across multiple functional areas of the application, suggesting that the development team failed to implement consistent input validation and output encoding practices across the entire codebase. The presence of XSS vulnerabilities in both edit and customer management functions indicates that user data handling throughout the application is at risk.
The operational impact of this vulnerability extends beyond simple data theft, as it can enable sophisticated attack chains that compromise the entire application ecosystem. An attacker who successfully exploits these vulnerabilities can establish persistent access to the application, potentially leading to full system compromise through session hijacking or privilege escalation. The fact that multiple parameters across different files are affected suggests that the vulnerability is not isolated to a single function but represents a fundamental flaw in the application's security architecture. This type of vulnerability aligns with ATT&CK technique T1531 which involves creating or modifying system processes, and T1059 which covers command and scripting interpreter usage, as attackers can leverage the XSS to execute malicious code within victim browsers. The vulnerability also poses significant business risks including data breaches, regulatory compliance violations, and potential reputational damage.
Mitigation strategies for CVE-2021-40260 require immediate implementation of comprehensive input validation and output encoding measures across all affected application components. The primary defense mechanism involves implementing strict parameter validation that rejects or sanitizes any input containing potentially malicious script content before processing. Additionally, the application should implement proper output encoding for all dynamic content, ensuring that any user-supplied data rendered in HTML contexts is properly escaped to prevent script execution. Security headers such as Content Security Policy should be implemented to provide additional protection against XSS attacks. Regular security testing including automated vulnerability scanning and manual penetration testing should be conducted to identify similar issues throughout the application. The fix should align with OWASP Top 10 security practices and follow the principle of least privilege in input handling, ensuring that all parameters are validated against expected data types and formats before being processed or displayed to end users.