Fortinet Discovers Synology Cloud Station Backup DLL Preloading Vulnerability
Fortinet's FortiGuard Labs has discovered a DLL preloading vulnerability in Synology Cloud Station Backup.
Synology's Cloud Station Backup is a backup service that allows you to back up your files from multiple client computers to a centralized Synology product.
Synology Cloud Station Backup before 4.2.5-4396 is susceptible to multiple DLL preloading vulnerabilities. The issue occurs when the application looks to load a DLL for execution and loads an attacker provided malicious DLL instead of the legitimate DLL. The application generally follows a specific search path to locate the DLL. The vulnerability can be exploited by a simple file write (or potentially an over-write) which results in a foreign DLL (located in the current working directory) running under the context of the application.
SolutionsUsers should apply the solution provided by Synology.
Fortinet reported the vulnerability to Synology on July 7, 2017.
Synology released patch for it on August 30, 2017.
This vulnerability was discovered by Kushal Arvind Shah of Fortinet's FortiGuard Labs.