CAPEC-96: Block Access to Libraries
CAPEC版本: 3.9
更新日期: 2023-01-24
攻击模式描述
An application typically makes calls to functions that are a part of libraries external to the application. These libraries may be part of the operating system or they may be third party libraries. It is possible that the application does not handle situations properly where access to these libraries has been blocked. Depending on the error handling within the application, blocked access to libraries may leave the system in an insecure state that could be leveraged by an attacker.
执行流程
步骤 1 Explore
Determine what external libraries the application accesses.
步骤 2 Experiment
Block access to the external libraries accessed by the application.
步骤 3 Experiment
Monitor the behavior of the system to see if it goes into an insecure/inconsistent state.
步骤 4 Experiment
If the system does go into an insecure/inconsistent state, leverage that to obtain information about the system functionality or data, elevate access control, etc. The rest of this attack will depend on the context and the desired goal.
前提条件
- An application requires access to external libraries.
- An attacker has the privileges to block application access to external libraries.
所需技能
后果影响
影响范围: Availability
技术影响: Alter Execution Logic
影响范围: Confidentiality
技术影响: Other
影响范围: Confidentiality Access Control Authorization
技术影响: Bypass Protection Mechanism
缓解措施
Ensure that application handles situations where access to APIs in external libraries is not available securely. If the application cannot continue its execution safely it should fail in a consistent and secure fashion.
示例实例
A web-based system uses a third party cryptographic random number generation library that derives entropy from machine's hardware. This library is used in generation of user session ids used by the application. If the library is inaccessible, the application instead uses a software based weak pseudo random number generation library. An attacker of the system blocks access of the application to the third party cryptographic random number generation library (by renaming it). The application in turn uses the weak pseudo random number generation library to generate session ids that are predictable. An attacker then leverages this weakness to guess a session id of another user to perform a horizontal elevation of privilege escalation and gain access to another user's account.