CAPEC-12: Choosing Message Identifier
CAPEC版本: 3.9
更新日期: 2023-01-24
攻击模式描述
This pattern of attack is defined by the selection of messages distributed 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.
执行流程
步骤 1 Explore
[Determine Nature of Messages] Determine the nature of messages being transported as well as the identifiers to be used as part of the attack
步骤 2 Experiment
[Authenticate] If required, authenticate to the distribution channel
步骤 3 Experiment
[Identify Known Client Identifiers] If any particular client's information is available through a control channel available to all users, the adversary will discover particular identifiers for targeted clients by observing this channel, or requesting client information through this channel.
步骤 4 Experiment
[Change Message Identifier] Adversaries with client access connecting to output channels could change their channel identifier and see someone else's (perhaps more privileged) data.
前提条件
- 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.
所需技能
所需资源
- The adversary needs the ability to control source code or application configuration responsible for selecting which message/channel id is absorbed from the public distribution means.
后果影响
影响范围: Confidentiality
技术影响: Read Data
影响范围: Confidentiality Access Control Authorization
技术影响: Gain Privileges
缓解措施
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.
示例实例
A certain B2B interface on a large application codes for messages passed over an MQSeries queue, on a single "Partners" channel. Messages on that channel code for their client destination based on a partner_ID field, held by each message. That field is a simple integer. Adversaries having access to that channel, perhaps a particularly nosey partner, can simply choose to store messages of another partner's ID and read them as they desire. Note that authentication does not prevent a partner from leveraging this attack on other partners. It simply disallows adversaries without partner status from conducting this attack.