CVE-2020-18698: 
Python vulnerability analysis and mitigation

Improper Authentication in Lin-CMS-Flask v0.1.1 allows remote attackers to launch brute force login attempts without restriction via the 'login' function in the component 'app/api/cms/user.py'. The vulnerability was disclosed on August 16, 2021, and is tracked as CVE-2020-18698. The vulnerability affects Lin-CMS-Flask version 0.1.1 (NVD, AttackerKB).

The vulnerability is classified as CWE-307 (Improper Restriction of Excessive Authentication Attempts). The issue stems from the login function in app/api/cms/user.py not implementing any restrictions on the number of failed authentication attempts. This allows attackers to perform unlimited authentication attempts without any rate limiting or account lockout mechanisms. The vulnerability has been assigned a CVSS v3.1 base score of 9.8 (CRITICAL) with the vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H, indicating network accessibility, low attack complexity, and no required privileges or user interaction (NVD).

The vulnerability allows attackers to perform unlimited brute force attempts against user accounts without any restrictions. This could lead to unauthorized access to user accounts through password guessing attacks. Given the CVSS score of 9.8, successful exploitation could result in a complete compromise of system confidentiality, integrity, and availability (NVD).

The vulnerability is highly exploitable as it requires no special privileges or user interaction. An attacker only needs network access to the application to attempt exploitation. The issue was reported through a security researcher who identified the vulnerability in the login function (GitHub Issue).

Common protection mechanisms recommended for this type of vulnerability include: implementing a limit on the number of failed authentication attempts, adding timeouts between attempts, implementing account lockout policies, and requiring additional verification mechanisms such as CAPTCHA. Organizations should also consider using vetted authentication libraries that include these security controls by default (CWE).