Guessable CAPTCHA |
Weakness ID: 804 (Weakness Base) | Status: Incomplete |
Description Summary
Extended Description
An automated attacker could bypass the intended protection of the CAPTCHA challenge and perform actions at a higher frequency than humanly possible, such as launching spam attacks.
There can be several different causes of a guessable CAPTCHA:
An audio or visual image that does not have sufficient distortion from the unobfuscated source image.
A question is generated that with a format that can be automatically recognized, such as a math question.
A question for which the number of possible answers is limited, such as birth years or favorite sports teams.
A general-knowledge or trivia question for which the answer can be accessed using a data base, such as country capitals or popular actors.
Other data associated with the CAPTCHA may provide hints about its contents, such as an image whose filename contains the word that is used in the CAPTCHA.
Scope | Effect |
---|---|
Integrity | Technical Impact: Bypass security When authorization, authentication, or another protection mechanism relies on CAPTCHA entities to ensure that only human actors can access certain functionality, then an automated attacker such as a bot may access the restricted functionality by guessing the CAPTCHA. |
Ordinality | Description |
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Primary | (where the weakness exists independent of other weaknesses) |
Nature | Type | ID | Name | View(s) this relationship pertains to![]() |
---|---|---|---|---|
ChildOf | ![]() | 285 | Improper Access Control (Authorization) | Development Concepts (primary)699 Research Concepts (primary)1000 |
ChildOf | ![]() | 287 | Improper Authentication | Development Concepts699 Research Concepts1000 |
ChildOf | ![]() | 330 | Use of Insufficiently Random Values | Development Concepts699 Research Concepts1000 |
ChildOf | ![]() | 808 | 2010 Top 25 - Weaknesses On the Cusp | Weaknesses in the 2010 CWE/SANS Top 25 Most Dangerous Programming Errors (primary)800 |
Web Application Security Consortium. "Insufficient Anti-automation". <http://projects.webappsec.org/Insufficient+Anti-automation>. |