Privilege Chaining

Opis

Two distinct privileges, roles, capabilities, or rights can be combined in a way that allows an entity to perform unsafe actions that would not be allowed without that combination.

Skutki

• Access Control

  Gain Privileges or Assume Identity

  A user can be given or gain access rights of another user. This can give the user unauthorized access to sensitive information including the access information of another user.

Zapobieganie

• Architecture and Design · Separation of Privilege

  Consider following the principle of separation of privilege. Require multiple conditions to be met before permitting access to a system resource.

• Architecture and Design, Operation

  Very carefully manage the setting, management, and handling of privileges. Explicitly manage trust zones in the software.

• Architecture and Design, Operation · Environment Hardening

  Run your code using the lowest privileges that are required to accomplish the necessary tasks [REF-76]. If possible, create isolated accounts with limited privileges that are only used for a single task. That way, a successful attack will not immediately give the attacker access to the rest of the software or its environment. For example, database applications rarely need to run as the database administrator, especially in day-to-day operations.

Przykłady podatności

• CVE-2005-1736 Chaining of user rights.
• CVE-2002-1772 Gain certain rights via privilege chaining in alternate channel.
• CVE-2005-1973 Application is allowed to assign extra permissions to itself.
• CVE-2003-0640 "operator" user can overwrite usernames and passwords to gain admin privileges.

Słabość nadrzędna

• CWE-269 Improper Privilege Management

Kiedy powstaje

• Architecture and Design
• Implementation — REALIZATION: This weakness is caused during implementation of an architectural security tactic.
• Operation

Dotyczy

Not Language-Specific

Uwagi

There is some conceptual overlap with Unsafe Privilege.

Źródła

1. Least Privilege — Sean Barnum, Michael Gegick, 2005