CVE-2022-4850 in memos
Summary
by MITRE • 12/29/2022
Cross-Site Request Forgery (CSRF) in GitHub repository usememos/memos prior to 0.9.1.
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Analysis
by VulDB Data Team • 01/26/2023
The vulnerability identified as CVE-2022-4850 represents a critical cross-site request forgery flaw discovered in the usememos/memos repository prior to version 0.9.1. This repository serves as a self-hosted memo management application that allows users to create, organize, and share notes and memos within collaborative environments. The CSRF vulnerability arises from the application's insufficient protection mechanisms against unauthorized commands executed on behalf of authenticated users, potentially enabling attackers to perform actions without the user's knowledge or consent. The flaw specifically affects the application's handling of state-changing operations that do not adequately validate the origin of requests, creating a pathway for malicious actors to exploit user sessions.
The technical implementation of this vulnerability stems from the absence of proper anti-CSRF token validation within the application's request processing pipeline. When users authenticate to the memos application, their session remains active and can be leveraged by attackers who craft malicious requests designed to execute unauthorized operations. The vulnerability manifests when the application processes requests that modify user data, create new entries, or alter system configurations without verifying that the request originated from a legitimate source within the same origin. This weakness aligns with CWE-352, which specifically addresses Cross-Site Request Forgery vulnerabilities in software applications. The flaw permits attackers to construct malicious web pages or send crafted HTTP requests that exploit the trust relationship between the victim's browser and the memos application, effectively bypassing standard authentication mechanisms.
The operational impact of this vulnerability extends beyond simple data manipulation, as it can enable comprehensive compromise of user accounts and system integrity within the memos environment. Attackers could potentially create new user accounts, modify existing memos, delete important data, or escalate privileges within the application. The severity increases when considering that memos applications often contain sensitive information, personal notes, and potentially confidential business data. The vulnerability affects all users who maintain active sessions with the application, making it particularly dangerous in collaborative environments where multiple users access shared repositories. This flaw can be exploited through various attack vectors including phishing campaigns, compromised websites, or social engineering techniques that trick users into visiting malicious pages that automatically submit requests to the vulnerable memos application. The attack surface is further expanded by the fact that many organizations rely on self-hosted solutions like memos for internal communications and documentation, making this vulnerability particularly concerning for enterprise environments.
Mitigation strategies for CVE-2022-4850 require immediate implementation of proper anti-CSRF protection mechanisms within the memos application. Organizations should upgrade to version 0.9.1 or later, which includes the necessary security patches addressing this vulnerability. The recommended approach involves implementing robust CSRF token validation that ensures all state-changing requests contain valid tokens generated server-side and tied to the user's session. This approach aligns with ATT&CK technique T1566.002 which covers phishing with malicious attachments and links, emphasizing the importance of validating request origins and implementing proper session management controls. Additional protective measures include implementing Content Security Policy headers, enforcing strict origin validation, and ensuring that all user-initiated operations require explicit confirmation through multi-factor authentication where appropriate. Security teams should also conduct thorough penetration testing and vulnerability assessments to identify any other potential CSRF vulnerabilities within the application's codebase and related systems. Regular security updates and monitoring of the application's behavior will help maintain protection against similar vulnerabilities that may emerge in the future.