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TheoMitre CWE

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Dữ liệu MITRE CWE chính thức

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Hiện thực hóa: The programmer may assume that certain events or conditions will never occur or do not need to be worried about, such as low memory conditions, lack of access to resources due to restrictive permissions, or misbehaving clients or components. Attackers may intentionally trigger these unusual conditions, thus violating the programmer's assumptions.
Hiện thực hóa: REALIZATION: This weakness is caused during implementation of an architectural security tactic.

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Dữ liệu MITRE CWE chính thức

Tác động	Phạm vi	Diễn giải
Từ chối dịch vụ: sập, thoát hoặc khởi động lại, Trạng thái ngoài dự kiến	Tính toàn vẹn, Tính sẵn sàng	This could lead to instability, incorrect behavior, or a vulnerability. Any data that was produced as a result of a function call could be in a bad state upon return. If the return value is not checked, then this bad data may be used in operations, possibly leading to a crash or other unintended behaviors.

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Dữ liệu MITRE CWE chính thức

Lựa chọn ngôn ngữ · Yêu cầuUse a language that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid. Choose languages with features such as exception handling that force the programmer to anticipate unusual conditions that may generate exceptions. Custom exceptions may need to be developed to handle unusual business-logic conditions. Be careful not to pass sensitive exceptions back to the user (CWE-209, CWE-248).
Hiện thực hóa · Hiệu quả: CaoCheck the results of all functions that return a value and verify that the value is expected.Checking the return value of the function will typically be sufficient, however beware of race conditions (CWE-362) in a concurrent environment.
Hiện thực hóa · Hiệu quả: CaoIf using exception handling, catch and throw specific exceptions instead of overly-general exceptions (CWE-396, CWE-397). Catch and handle exceptions as locally as possible so that exceptions do not propagate too far up the call stack (CWE-705). Avoid unchecked or uncaught exceptions where feasible (CWE-248).Using specific exceptions, and ensuring that exceptions are checked, helps programmers to anticipate and appropriately handle many unusual events that could occur.
Hiện thực hóaEnsure that error messages only contain minimal details that are useful to the intended audience and no one else. The messages need to strike the balance between being too cryptic (which can confuse users) or being too detailed (which may reveal more than intended). The messages should not reveal the methods that were used to determine the error. Attackers can use detailed information to refine or optimize their original attack, thereby increasing their chances of success. If errors must be captured in some detail, record them in log messages, but consider what could occur if the log messages can be viewed by attackers. Highly sensitive information such as passwords should never be saved to log files. Avoid inconsistent messaging that might accidentally tip off an attacker about internal state, such as whether a user account exists or not. Exposing additional information to a potential attacker in the context of an exceptional condition can help the attacker determine what attack vectors are most likely to succeed beyond DoS.
Kiểm tra dữ liệu đầu vào · Hiện thực hóaAssume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does. When performing input validation, consider all potentially relevant properties, including length, type of input, the full range of acceptable values, missing or extra inputs, syntax, consistency across related fields, and conformance to business rules. As an example of business rule logic, "boat" may be syntactically valid because it only contains alphanumeric characters, but it is not valid if the input is only expected to contain colors such as "red" or "blue." Do not rely exclusively on looking for malicious or malformed inputs. This is likely to miss at least one undesirable input, especially if the code's environment changes. This can give attackers enough room to bypass the intended validation. However, denylists can be useful for detecting potential attacks or determining which inputs are so malformed that they should be rejected outright.Performing extensive input validation does not help with handling unusual conditions, but it will minimize their occurrences and will make it more difficult for attackers to trigger them.
Kiến trúc và thiết kế, Hiện thực hóaIf the program must fail, ensure that it fails gracefully (fails closed). There may be a temptation to simply let the program fail poorly in cases such as low memory conditions, but an attacker may be able to assert control before the software has fully exited. Alternately, an uncontrolled failure could cause cascading problems with other downstream components; for example, the program could send a signal to a downstream process so the process immediately knows that a problem has occurred and has a better chance of recovery.
Kiến trúc và thiết kếUse system limits, which should help to prevent resource exhaustion. However, the product should still handle low resource conditions since they may still occur.

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Dữ liệu MITRE CWE chính thức

Phương pháp	Cách làm	Hiệu quả
Phân tích tĩnh tự động	Automated static analysis may be useful for detecting unusual conditions involving system resources or common programming idioms, but not for violations of business rules.	Khá
Phân tích động thủ công	Identify error conditions that are not likely to occur during normal usage and trigger them. For example, run the program under low memory conditions, run with insufficient privileges or permissions, interrupt a transaction before it is completed, or disable connectivity to basic network services such as DNS. Monitor the software for any unexpected behavior. If you trigger an unhandled exception or similar error that was discovered and handled by the application's environment, it may still indicate unexpected conditions that were not handled by the application itself.	-

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Dữ liệu MITRE CWE chính thức

Dưới đây là các lỗ hổng tiêu biểu liên quan đến CWE-754, dựa theo mức độ ưu tiên

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CWE-754: Improper Check for Unusual or Exceptional Conditions

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