An authenticated attacker can execute arbitrary commands as root in Terramaster F4-210, F2-210 TOS 4.2.X (4.2.15-2107141517) by injecting a maliciously crafted input in the request through /tos/index.php?app/hand_app.

TerraMaster F2-210 devices through 2021-04-03 use UPnP to make the admin web server accessible over the Internet on TCP port 8181, which is arguably inconsistent with the "It is only available on the local network" documentation. NOTE: manually editing /etc/upnp.json provides a partial but undocumented workaround.

Incorrect Access Control vulnerability in TerraMaster TOS <= 4.2.06 allows remote authenticated attackers to bypass read-only restriction and obtain full access to any folder within the NAS

Multiple directory traversal vulnerabilities in TerraMaster TOS <= 4.2.06 allow remote authenticated attackers to read, edit or delete any file within the filesystem via the (1) filename parameter to /tos/index.php?editor/fileGet, Event parameter to /include/ajax/logtable.php, or opt parameter to /include/core/index.php.

Email Injection in TerraMaster TOS <= 4.2.06 allows remote unauthenticated attackers to abuse the forget password functionality and achieve account takeover.

User Enumeration vulnerability in TerraMaster TOS <= 4.2.06 allows remote unauthenticated attackers to identify valid users within the system via the username parameter to wizard/initialise.php.

TerraMaster TOS <= 4.2.06 was found to check for updates (of both system and applications) via an insecure channel (HTTP). Man-in-the-middle attackers are able to intercept these requests and serve a weaponized/infected version of applications or updates.

Cross-site scripting (XSS) vulnerability in TerraMaster TOS <= 4.2.06 allows remote authenticated users to inject arbitrary web script or HTML via the mod parameter to /module/index.php.

An issue was discovered on TerraMaster FS-210 4.0.19 devices. Normal users can use 1.user.php for privilege elevation.

An issue was discovered on TerraMaster FS-210 4.0.19 devices. An unauthenticated attacker can download log files via the include/makecvs.php?Event= substring.