CVE-2022-24880— Potential Captcha Validate Bypass in flask-session-captcha
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I. Basic Information for CVE-2022-24880
Vulnerability Information
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Vulnerability Title
Potential Captcha Validate Bypass in flask-session-captcha
Source: NVD (National Vulnerability Database)
Vulnerability Description
flask-session-captcha is a package which allows users to extend Flask by adding an image based captcha stored in a server side session. In versions prior to 1.2.1, he `captcha.validate()` function would return `None` if passed no value (e.g. by submitting an having an empty form). If implementing users were checking the return value to be **False**, the captcha verification check could be bypassed. Version 1.2.1 fixes the issue. Users can workaround the issue by not explicitly checking that the value is False. Checking the return value less explicitly should still work.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
对函数返回值的检查不正确
Source: NVD (National Vulnerability Database)
Vulnerability Title
flask-session-captcha 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
flask-session-captcha是德国Joakim Uddholm个人开发者的一个 flask 的验证码实现。 flask-session-captcha 1.2.1之前版本存在安全漏洞，该漏洞源于如果没有传递任何值，`captcha.validate()`函数将返回`None`，如果返回值为**False**，则可以绕过验证码验证检查。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Tethik | flask-session-captcha | < 1.2.1 | - |
II. Public POCs for CVE-2022-24880
| # | POC Description | Source Link | Shenlong Link |
|---|
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- https://github.com/Tethik/flask-session-captcha/pull/27x_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2022-24880
IV. Related Vulnerabilities
Same weakness: CWE-253
V. Comments for CVE-2022-24880
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