CVE-2023-5791 in Sticky Notes App
Summary
by MITRE • 10/26/2023
A vulnerability, which was classified as problematic, was found in SourceCodester Sticky Notes App 1.0. This affects an unknown part of the file endpoint/add-note.php. The manipulation of the argument noteTitle/noteContent leads to cross site scripting. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used. The identifier VDB-243597 was assigned to this vulnerability.
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Analysis
by VulDB Data Team • 11/18/2023
The vulnerability identified as CVE-2023-5791 represents a critical cross site scripting flaw within the SourceCodester Sticky Notes App version 1.0, specifically affecting the endpoint/add-note.php file. This weakness resides in the application's handling of user input parameters noteTitle and noteContent, which are processed without adequate sanitization or validation mechanisms. The vulnerability's classification as problematic stems from its potential for remote exploitation, allowing attackers to inject malicious scripts into the application's response that will execute in the context of other users' browsers. The disclosure of this exploit to the public community significantly increases the risk surface, as malicious actors can now leverage this weakness without requiring advanced technical skills or specialized tools. The vulnerability demonstrates a fundamental failure in input validation and output encoding practices that are essential for preventing XSS attacks in web applications.
The technical implementation of this vulnerability occurs when user-supplied data is directly incorporated into the application's response without proper sanitization. The noteTitle and noteContent parameters serve as entry points for malicious script injection, where attackers can craft specially formatted input that, when processed by the add-note.php endpoint, gets rendered back to users' browsers as executable code. This flaw falls under CWE-79 which specifically addresses Cross-Site Scripting vulnerabilities, where improper validation of input allows attackers to inject malicious scripts that can execute in the victim's browser context. The remote exploitation capability means that attackers can trigger this vulnerability through web requests without requiring physical access to the target system, making it particularly dangerous in web-facing applications. The application's failure to implement proper Content Security Policy headers and input sanitization mechanisms creates an environment where malicious scripts can persistently execute against unsuspecting users.
The operational impact of this vulnerability extends beyond simple script execution, as it can enable sophisticated attack chains that compromise user sessions, steal sensitive information, or redirect users to malicious sites. Attackers can leverage this vulnerability to perform session hijacking, steal cookies, or inject additional malicious payloads that can persist across user sessions. The vulnerability's presence in a note-taking application creates particular risk as users may store sensitive personal or professional information within the notes, making successful exploitation potentially devastating for individual users. The disclosed exploit status means that threat actors can immediately implement this attack without developing custom payloads, significantly increasing the probability of successful compromise. This vulnerability also demonstrates poor security hygiene in the application's development lifecycle, as proper input validation should have been implemented during the design and development phases rather than being addressed as a post-deployment fix.
Mitigation strategies for CVE-2023-5791 should focus on immediate input validation and sanitization of all user-supplied parameters within the add-note.php endpoint. The application must implement proper output encoding for all dynamic content before rendering it to users, specifically ensuring that noteTitle and noteContent parameters are sanitized using context-appropriate encoding mechanisms such as HTML entity encoding for web page contexts. Organizations should implement Content Security Policy headers to limit the execution of inline scripts and restrict the sources from which scripts can be loaded. The application should also employ proper input validation techniques including length restrictions, character set validation, and the use of allowlists for acceptable input patterns. Additionally, regular security testing including automated scanning and manual penetration testing should be conducted to identify similar vulnerabilities in other application components. The vulnerability serves as a reminder of the critical importance of implementing defense-in-depth strategies that include both server-side input validation and client-side security measures to prevent XSS attacks. Security teams should also consider implementing web application firewalls to provide additional protection layers against known attack patterns. The disclosed nature of this vulnerability requires immediate remediation efforts to prevent exploitation while also implementing monitoring mechanisms to detect potential attempts to leverage this weakness.