CVE-2024-23735 in SNotify
Summary
by MITRE • 04/10/2024
Cross Site Scripting (XSS) vulnerability in in the S/MIME certificate upload functionality of the User Profile pages in savignano S/Notify before 4.0.0 for Confluence allows attackers to manipulate user data via specially crafted certificate.
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Analysis
by VulDB Data Team • 04/07/2025
The vulnerability CVE-2024-23735 represents a critical cross site scripting flaw within the savignano S/Notify plugin for Confluence, specifically targeting the S/MIME certificate upload functionality in user profile pages. This vulnerability exists in versions prior to 4.0.0 and allows remote attackers to execute malicious scripts in the context of other users' browsers through manipulated certificate uploads. The flaw stems from insufficient input validation and output encoding mechanisms when processing S/MIME certificates, creating an avenue for attackers to inject malicious JavaScript code that executes in the victim's browser session. The vulnerability is classified as CWE-79 - Improper Neutralization of Input During Web Page Generation, which is a fundamental weakness in web application security that enables XSS attacks by failing to properly sanitize user-supplied data before rendering it in web pages. The attack vector leverages the certificate upload functionality, where attackers can craft malicious certificates containing embedded script payloads that persist in the user profile interface and execute when other users view these profiles.
The technical exploitation of this vulnerability occurs when an attacker uploads a specially crafted S/MIME certificate that contains malicious JavaScript code within its metadata or content fields. The system fails to properly sanitize or escape the certificate data before displaying it in user profile pages, allowing the injected scripts to execute in the context of authenticated users. This creates a persistent XSS condition where the malicious code becomes part of the user profile and executes every time the profile is accessed. The vulnerability is particularly dangerous because it operates within the user profile context, meaning that any authenticated user who views the compromised profile will be affected. This type of attack aligns with ATT&CK technique T1531 - Account Access Removal, as it can lead to unauthorized access through session hijacking and data manipulation. The impact extends beyond simple script execution to potential privilege escalation, data theft, and session manipulation attacks that can compromise the entire Confluence instance.
The operational impact of CVE-2024-23735 is severe for organizations using the savignano S/Notify plugin, as it enables attackers to gain unauthorized access to user sessions and potentially escalate privileges within the Confluence environment. Successful exploitation can result in unauthorized data modification, information disclosure, and potential lateral movement within the network. The vulnerability affects the integrity and confidentiality of user profile data, as attackers can modify profile information, inject malicious content, or redirect users to phishing sites. Organizations may experience unauthorized access to sensitive corporate information stored within Confluence profiles, and the persistent nature of the XSS vulnerability means that the attack remains active until the certificate is removed or the plugin is updated. The attack can also facilitate more sophisticated exploitation techniques such as credential theft through browser-based attacks, making this vulnerability particularly dangerous in enterprise environments where Confluence serves as a central collaboration platform. The vulnerability's impact is compounded by the fact that it affects user profile pages, which are frequently accessed and viewed by multiple users, potentially amplifying the attack surface.
Organizations should immediately upgrade to version 4.0.0 or later of the savignano S/Notify plugin to remediate this vulnerability. The update addresses the insufficient input validation and output encoding issues by implementing proper sanitization of certificate data and ensuring that all user-supplied content is properly escaped before rendering in web pages. Additional mitigations include implementing content security policies to restrict script execution, disabling unnecessary certificate upload functionality where possible, and monitoring user profile modifications for suspicious activity. Security teams should also conduct thorough audits of user profile data to identify any potential exploitation attempts and implement web application firewalls to detect and block malicious certificate uploads. The vulnerability demonstrates the importance of proper input validation and output encoding in web applications, and organizations should review their security practices to ensure similar issues are not present in other components of their Confluence environment. Regular security assessments and vulnerability scanning should be implemented to identify and remediate similar weaknesses in other plugins and custom applications that may be vulnerable to cross site scripting attacks.