Weakness (CWE)
CWE-639: Authorization Bypass Through User-Controlled Key
The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.
More detail
It is likely that an attacker would have to be an authenticated user in the system. However, the authorization process would not properly check the data access operation to ensure that the authenticated user performing the operation has sufficient entitlements to perform the requested data access, hence bypassing any other authorization checks present in the system.
For example, attackers can look at places where user specific data is retrieved (e.g. search screens) and determine whether the key for the item being looked up is controllable externally. The key may be a hidden field in the HTML form field, might be passed as a URL parameter or as an unencrypted cookie variable, then in each of these cases it will be possible to tamper with the key value.
How to prevent it (3 mitigations)
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Architecture and Design
For each and every data access, ensure that the user has sufficient privilege to access the record that is being requested.
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Architecture and Design, Implementation
Make sure that the key that is used in the lookup of a specific user's record is not controllable externally by the user or that any tampering can be detected.
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Architecture and Design
Use encryption in order to make it more difficult to guess other legitimate values of the key or associate a digital signature with the key so that the server can verify that there has been no tampering.
Source: MITRE CWE-639
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Medium 5.3
Growatt Cloud portal Authorization Bypass Through User-Controlled Key
Unauthenticated attackers can retrieve full list of users associated with arbitrary accounts.
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Medium 5.3
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Unauthenticated attackers can add devices of other users to their scenes (or arbitrary scenes of other arbitrary users).
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Medium 5.3
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Unauthenticated attackers can rename "rooms" of arbitrary users.
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Medium 5.3
Growatt Cloud portal Authorization Bypass Through User-Controlled Key
Unauthenticated attackers can retrieve serial number of smart meters associated to a specific user account.
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Medium 5.3
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Unauthenticated attackers can query information about total energy consumed by EV chargers of arbitrary users.
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Medium 6.5
Growatt Cloud portal Authorization Bypass Through User-Controlled Key
Unauthenticated attackers can trigger device actions associated with specific "scenes" of arbitrary users.
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Medium 5.3
Growatt Cloud portal Authorization Bypass Through User-Controlled Key
An unauthenticated attackers can obtain a list of smart devices by knowing a valid username through an unprotected API.
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Medium 5.3
Growatt Cloud portal Authorization Bypass Through User-Controlled Key
An attacker can export other users' plant information.
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Medium 5.3
Growatt Cloud portal Authorization Bypass Through User-Controlled Key
An unauthenticated attacker can hijack other users' devices and potentially control them.
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Medium 5.3
Growatt Cloud portal Authorization Bypass Through User-Controlled Key
An unauthenticated attacker can delete any user's "rooms" by knowing the user's and room IDs.
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Medium 5.3
Growatt Cloud portal Authorization Bypass Through User-Controlled Key
An unauthenticated attacker can obtain EV charger version and firmware upgrading history by knowing the charger ID.
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Medium 5.3
Growatt Cloud portal Authorization Bypass Through User-Controlled Key
An unauthenticated attacker can obtain EV charger energy consumption information of other users.
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Medium 5.3
Growatt Cloud portal Authorization Bypass Through User-Controlled Key
An unauthenticated attacker can obtain other users' charger information.
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Medium 5.3
Growatt Cloud portal Authorization Bypass Through User-Controlled Key
Unauthenticated attackers can rename arbitrary devices of arbitrary users (i.e., EV chargers).
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Medium 5.3
Growatt Cloud portal Authorization Bypass Through User-Controlled Key
Unauthenticated attackers can query an API endpoint and get device details.
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Medium 5.3
Growatt Cloud portal Authorization Bypass Through User-Controlled Key
An attacker can get information about the groups of the smart home devices for arbitrary users (i.e., "rooms").
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Medium 5.3
Growatt Cloud portal Authorization Bypass Through User-Controlled Key
Unauthenticated attackers can obtain restricted information about a user's smart device collections (i.e., "scenes").