| Name | Choosing Message Identifier |
| Summary | This pattern of attack is defined by the selection of messages distributed over via multicast or public information channels that are intended for another client by determining the parameter value assigned to that client. This attack allows the adversary to gain access to potentially privileged information, and to possibly perpetrate other attacks through the distribution means by impersonation. If the channel/message being manipulated is an input rather than output mechanism for the system, (such as a command bus), this style of attack could be used to change the adversary's identifier to more a privileged one. |
| Prerequisites | Information and client-sensitive (and client-specific) data must be present through a distribution channel available to all users. Distribution means must code (through channel, message identifiers, or convention) message destination in a manner visible within the distribution means itself (such as a control channel) or in the messages themselves. |
| Solutions | The purpose is to architect the system in a way that associates proper authentication/authorization with each channel/message. Re-architect system input/output channels as appropriate to distribute self-protecting data. That is, encrypt (or otherwise protect) channels/messages so that only authorized readers can see them. |
| Related Weaknesses |
| CWE ID | Description |
| CWE-201 | Exposure of Sensitive Information Through Sent Data |
| CWE-306 | Missing Authentication for Critical Function |
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