[FD] ProjectSend r754 - IDOR & Authentication Bypass Vulnerability

Document Title: =============== ProjectSend r754 - IDOR & Authentication Bypass Vulnerability References (Source): ==================== http://ift.tt/2kGNA3u Release Date: ============= 2017-02-21 Vulnerability Laboratory ID (VL-ID): ==================================== 2031 Common Vulnerability Scoring System: ==================================== 5.3 Product & Service Introduction: =============================== ProjectSend is a self-hosted application (you can install it easily on your own VPS or shared web hosting account) that lets you upload files and assign them to specific clients that you create yourself! Secure, private and easy. No more depending on external services or e-mail to send those files. (Copy of the Homepage: http://ift.tt/1eNhd58 ) Abstract Advisory Information: ============================== The vulnerability laboratory core research team discovered a idor and authentication bypass vulnerability in the ProjectSend-r754 web-application. Vulnerability Disclosure Timeline: ================================== 2017-02-20: Public Disclosure (Vulnerability Laboratory) Discovery Status: ================= Published Affected Product(s): ==================== GNU GPL License Product: ProjectSend r754 Exploitation Technique: ======================= Remote Severity Level: =============== Medium Technical Details & Description: ================================ An insecure direct object references occured in case of an application provides direct access to objects based on user-supplied input. As a result of this vulnerability attackers can bypass authorization and to access resources in the system. Insecure Direct Object References allows attackers to bypass authorization and access resources directly by modifying the value of a parameter[client] used. Thus finally point to other client account names, which allows an attackers to download others clients private data with no secure method provided. Vulnerability Method(s): [+] GET Vulnerable Module(s): [+] process.php?do=zip_download Vulnerable Parameter(s): [+] client [+] file Proof of Concept (PoC): ======================= The security vulnerability can be exploited by remote attackers with low privilege web-application user account and low user interaction. For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue. 1. User "A" as attacker checks a file to download as zip extension, then click download to modifiy values as required ... 2. Application responds with the client file list, so then you are able to download all other side user B data files with zip extension

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