eG Manager v7.1.2: Improper Access Control lead to Remote Code Execution (CVE-2020-8591)

Improper Access Control to Remote Code Execution (CVE-2020-8591)

In this post. I will explain how I hacked a whole system by exploiting improper access control vulnerability in the popular java-based MaaS software “eG Manager” and how I can escalated it to execute code remotely.


The Improper Access Control weakness describes a case where software fails to restrict access to an object properly. A malicious user can compromise security of the software and perform certain unauthorized actions by gaining elevated privileges, reading otherwise restricted information, executing commands, bypassing implemented security mechanisms, etc.