CVE-2024-23734 in SNotify
Summary
by MITRE • 04/10/2024
Cross Site Request Forgery vulnerability in in the upload functionality of the User Profile pages in savignano S/Notify before 2.0.1 for Bitbucket allow attackers to replace S/MIME certificate or PGP keys for arbitrary users via crafted link.
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Analysis
by VulDB Data Team • 04/07/2025
This cross site request forgery vulnerability exists within the savignano S/Notify plugin for Bitbucket prior to version 2.0.1, specifically targeting the user profile upload functionality. The flaw allows authenticated attackers to manipulate the certificate replacement process for arbitrary user accounts through crafted malicious links, bypassing the intended authentication and authorization controls. The vulnerability stems from insufficient validation of the request source and lack of proper anti-CSRF token implementation in the certificate upload endpoints. According to CWE-352, this represents a classic cross site request forgery weakness where the application fails to verify that requests originate from legitimate user interactions rather than malicious third parties. The attack vector specifically targets the S/MIME certificate and PGP key replacement mechanisms, which are critical for secure communication and code signing within Bitbucket environments.
The technical implementation of this vulnerability exploits the absence of proper request validation mechanisms in the plugin's user profile management system. When users navigate to their profile pages and attempt to upload new certificates or keys, the system does not adequately verify that the request originates from the authenticated user's legitimate session. Attackers can craft malicious URLs containing specific parameters that trigger certificate replacement operations without requiring proper authentication tokens or session validation. This allows them to substitute certificates for any user account within the system, potentially compromising the integrity of code signing processes and secure communications. The vulnerability operates at the application layer and leverages the trust relationship between the Bitbucket platform and the S/Notify plugin, making it particularly dangerous as it can be exploited by attackers who have gained access to the platform through other means.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it directly affects the security infrastructure of Bitbucket repositories. By replacing S/MIME certificates or PGP keys for arbitrary users, attackers can potentially impersonate legitimate developers, compromise code signing verification processes, and undermine the trust model that secure software development relies upon. This vulnerability enables attackers to perform persistent attacks against the repository's integrity mechanisms, potentially allowing them to inject malicious code that would appear to originate from trusted sources. The attack requires only that the victim click on a crafted link, making it particularly insidious as it can be delivered through phishing campaigns or compromised websites. The vulnerability also aligns with ATT&CK technique T1566.002 for phishing attacks and T1555.003 for credentials from password stores, as it exploits user trust and session management weaknesses.
Organizations using savignano S/Notify plugin versions prior to 2.0.1 should immediately implement mitigations including updating to the patched version 2.0.1 or later. The primary mitigation involves implementing robust anti-CSRF token mechanisms that are generated per-user session and validated on each request to certificate replacement endpoints. Additionally, organizations should consider implementing additional verification controls such as email confirmations for certificate changes, multi-factor authentication requirements for sensitive operations, and monitoring for unusual certificate replacement patterns. Security teams should also review their existing access controls and ensure that certificate management operations require explicit user confirmation before execution. The vulnerability demonstrates the critical importance of implementing proper session management and request validation controls in web applications, particularly those handling cryptographic materials and security credentials. Organizations should conduct comprehensive security assessments of their Bitbucket plugin ecosystem and ensure that all third-party integrations implement proper CSRF protection mechanisms to prevent similar vulnerabilities from being exploited.