The product supports a session in which more than one behavior must be performed by an actor, but it does not properly ensure that the actor performs the behaviors in the required sequence.
By performing actions in an unexpected order, or by omitting steps, an attacker could manipulate the business logic of the product or cause it to enter an invalid state. In some cases, this can also expose resultant weaknesses. For example, a file-sharing protocol might require that an actor perform separate steps to provide a username, then a password, before being able to transfer files. If the file-sharing server accepts a password command followed by a transfer command, without any username being provided, the product might still perform the transfer. Note that this is different than CWE-696, which focuses on when the product performs actions in the wrong sequence; this entry is closely related, but it is focused on ensuring that the actor performs actions in the correct sequence. Workflow-related behaviors include: Steps are performed in the expected order. Required steps are not omitted. Steps are not interrupted. Steps are performed in a timely fashion.
Threat Mapped score: 3.0
Industry: Finiancial
Threat priority: P2 - Serious (High)
CVE: CVE-2011-0348
Bypass of access/billing restrictions by sending traffic to an unrestricted destination before sending to a restricted destination.
CVE: CVE-2007-3012
Attacker can access portions of a restricted page by canceling out of a dialog.
CVE: CVE-2009-5056
Ticket-tracking system does not enforce a permission setting.
CVE: CVE-2004-2164
Shopping cart does not close a database connection when user restores a previous order, leading to connection exhaustion.
CVE: CVE-2003-0777
Chain: product does not properly handle dropped connections, leading to missing NULL terminator (CWE-170) and segmentation fault.
CVE: CVE-2005-3327
Chain: Authentication bypass by skipping the first startup step as required by the protocol.
CVE: CVE-2004-0829
Chain: File server crashes when sent a "find next" request without an initial "find first."
CVE: CVE-2010-2620
FTP server allows remote attackers to bypass authentication by sending (1) LIST, (2) RETR, (3) STOR, or other commands without performing the required login steps first.
CVE: CVE-2005-3296
FTP server allows remote attackers to list arbitrary directories as root by running the LIST command before logging in.
N/A
N/A
| Phase | Note |
|---|---|
| Implementation | REALIZATION: This weakness is caused during implementation of an architectural security tactic. |
Intro: This code is part of an FTP server and deals with various commands that could be sent by a user. It is intended that a user must successfully login before performing any other action such as retrieving or listing files.
Body: The server correctly avoids sending files to a user that isn't logged in and doesn't own the file. However, the server will incorrectly list the files in any directory without confirming the command came from an authenticated user, and that the user is authorized to see the directory's contents.
def dispatchCommand(command, user, args): if command == 'Login': loginUser(args) return # user has requested a file if command == 'Retrieve_file': if authenticated(user) and ownsFile(user,args): sendFile(args) return if command == 'List_files': listFiles(args) return ...