CWE-841 行为工作流的不恰当实施
Improper Enforcement of Behavioral Workflow
结构: Simple
Abstraction: Base
状态: Incomplete
被利用可能性: unkown
基本描述
The software 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.
扩展描述
By performing actions in an unexpected order, or by omitting steps, an attacker could manipulate the business logic of the software 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 software might still perform the transfer.
Note that this is different than CWE-696, which focuses on when the software 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:
相关缺陷
- cwe_Nature: ChildOf cwe_CWE_ID: 691 cwe_View_ID: 1000 cwe_Ordinal: Primary
常见的影响
| 范围 | 影响 | 注释 |
|---|---|---|
| Other | Alter Execution Logic | An attacker could cause the software to skip critical steps or perform them in the wrong order, bypassing its intended business logic. This can sometimes have security implications. |
示例代码
例
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.
bad Python
return
# user has requested a file
if command == 'Retrieve_file':
sendFile(args)
return
if command == 'List_files':
return
...
The server correctly does not send files to a user that isn't logged in and doesnt 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.
Here is a fixed version of the above example:
good Python
...
if command == 'List_files':
return
...
分析过的案例
| 标识 | 说明 | 链接 |
|---|---|---|
| CVE-2011-0348 | Bypass of access/billing restrictions by sending traffic to an unrestricted destination before sending to a restricted destination. | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-0348 |
| CVE-2007-3012 | Attacker can access portions of a restricted page by canceling out of a dialog. | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-3012 |
| CVE-2009-5056 | Ticket-tracking system does not enforce a permission setting. | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-5056 |
| CVE-2004-2164 | Shopping cart does not close a database connection when user restores a previous order, leading to connection exhaustion. | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-2164 |
| CVE-2003-0777 | Chain: product does not properly handle dropped connections, leading to missing NULL terminator (CWE-170) and segmentation fault. | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2003-0777 |
| CVE-2005-3327 | Chain: Authentication bypass by skipping the first startup step as required by the protocol. | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-3327 |
| CVE-2004-0829 | Chain: File server crashes when sent a "find next" request without an initial "find first." | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-0829 |
| 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. | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-2620 |
| CVE-2005-3296 | FTP server allows remote attackers to list arbitrary directories as root by running the LIST command before logging in. | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-3296 |
Notes
分类映射
| 映射的分类名 | ImNode ID | Fit | Mapped Node Name |
|---|---|---|---|
| WASC | 40 | Insufficient Process Validation |
引用
-
REF-796 Seven Business Logic Flaws That Put Your Website At Risk
-
REF-799 Defying Logic: Theory, Design, and Implementation of Complex Systems for Testing Application Logic
-
REF-667 Real-Life Example of a 'Business Logic Defect' (Screen Shots!)
-
REF-801 Toward Automated Detection of Logic Vulnerabilities in Web Applications
-
REF-802 Designing a Framework Method for Secure Business Application Logic Integrity in e-Commerce Systems
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