Document Title: =============== Binance v1.5.0 - Insecure File Permission Vulnerability References (Source): ==================== https://www.vulnerability-lab.com/get_content.php?id=2135 Release Date: ============= 2018-07-17 Vulnerability Laboratory ID (VL-ID): ==================================== 2135 Common Vulnerability Scoring System: ==================================== 2.5 Vulnerability Class: ==================== Access Permission Weakness Current Estimated Price: ======================== 500€ - 1.000€ Abstract Advisory Information: ============================== An independent vulnerability laboratory researcher discovered an insecure file permission vulnerability in the Binance v1.5.0 software. Vulnerability Disclosure Timeline: ================================== 2018-07-15: Researcher Notification & Coordination (Security Researcher) 2018-07-17: Public Disclosure (Vulnerability Laboratory) Discovery Status: ================= Published Affected Product(s): ==================== Binance Product: Binance 1.5.0 Exploitation Technique: ======================= Local Severity Level: =============== Low Authentication Type: ==================== Full authentication (admin) - full privileges User Interaction: ================= Medium User Interaction Disclosure Type: ================ Independent Security Research Technical Details & Description: ================================ Insecure File Permissions vulnerability has been discovered in the official Binance v1.5.0 software. The vulnerability allows local attackers to exploit insecure permissions setup for a software or process to exploit by manipulation. The vulnerability exists due to insecure default permissions set on the Binance.exe, start.exe and unins000.exe There are no integrity checks or validation proof to ensure that the executable file is not modified during the runtime or after it. A local attacker could exploit the local vulnerability by replacing `Binance.exe` and `start.exe` or `unins000.exe` with a malicious executable file. The malicious file could execute or modify with the LocalSystem permissions to followup with successful exploitation. Proof of Concept (PoC): ======================= Binance for windows contains a vulnerability that could allow a local attacker to gain elevated privileges. For security demonstration or to reproduce the vulnerability follow the provided information and steps below. -- PoC Session Logs (Permissions) -- C:Binance>icacls binance.exe Binance.exe BUILTINAdministrateurs:(I)(F) <--- Full Access AUTORITE NTSystème:(I)(F) BUILTINUtilisateurs:(I)(RX) AUTORITE NTUtilisateurs authentifiés:(I)(M) <--- Modify Information: 1 files correctly processed; 0 files failed to process C:Binance>icacls start.exe start.exe BUILTINAdministrateurs:(I)(F) <--- Full Access AUTORITE NTSystème:(I)(F) BUILTINUtilisateurs:(I)(RX) AUTORITE NTUtilisateurs authentifiés:(I)(M) <--- Modify Information: 1 files correctly processed; 0 files failed to process C:Binance>icacls unins000.exe unins000.exe BUILTINAdministrateurs:(I)(F) <--- Full Access AUTORITE NTSystème:(I)(F) BUILTINUtilisateurs:(I)(RX) AUTORITE NTUtilisateurs authentifiés:(I)(M) <--- Modify Information: 1 files correctly processed; 0 files failed to process Solution - Fix & Patch: ======================= Include multiple integrity checks for the software files on startup and during the static runtime. Change the access permissions for the process of all three executables files (binance.exe, stat.exe & uninst00.exe). Security Risk: ============== The security risk of the insecure file permissions vulnerability and missing integrity check in the software core is estimated as low. Credits & Authors: ================== ZwX [Vulnerability Laboratory - Security Manager] - https://www.vulnerability-lab.com/show.php?user=ZwX Disclaimer & Information: ========================= The information provided in this advisory is provided as it is without any warranty. Vulnerability Lab disclaims all warranties, either expressed or implied, including the warranties of merchantability and capability for a particular purpose. Vulnerability-Lab or its suppliers are not liable in any case of damage, including direct, indirect, incidental, consequential loss of business profits or special damages, even if Vulnerability-Lab or its suppliers have been advised of the possibility of such damages. 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