CVE-2021-33205: 
Western Digital EdgeRover vulnerability analysis and mitigation

Western Digital EdgeRover before version 0.25 contained an escalation of privileges vulnerability (CVE-2021-33205) that was discovered and disclosed on June 10, 2021. The vulnerability existed in the implementation of Node.js where a low privileged user could load malicious content into directories with higher privileges (Vendor Advisory).

The vulnerability stems from improper implementation of Node.js in EdgeRover that allowed loading modules from unauthorized paths. This implementation flaw enabled attackers to load malicious content into directories that should have required higher privileges. The vulnerability has been assigned a CVSS v3.1 base score of 8.8 HIGH with the vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H (NVD).

The vulnerability allows an attacker to gain admin privileges and perform malicious activities including creating fake libraries and stealing user credentials. The high CVSS score indicates severe potential impacts on system confidentiality, integrity, and availability (NVD, Vendor Advisory).

The vulnerability requires a low-privileged user account to exploit, making it relatively accessible to attackers who have gained initial access to the system. The attack complexity is rated as low, indicating that exploitation is straightforward once the prerequisite access is obtained (NVD).

Western Digital addressed this vulnerability in EdgeRover version 0.25 released on May 20, 2021. The fix includes correcting the load-modules path and disabling the loading of files from external locations where less privileged users could have access. Users should upgrade to version 0.25 or later to mitigate this vulnerability (Vendor Advisory).