CVE-2020-2303: 
Java vulnerability analysis and mitigation

A cross-site request forgery (CSRF) vulnerability was discovered in Jenkins Active Directory Plugin versions 2.19 and earlier. The vulnerability was identified as CVE-2020-2303 and was disclosed on November 4, 2020. The affected component is the Active Directory Plugin for Jenkins, which is used for authentication and integration with Active Directory servers (Jenkins Advisory, NVD).

The vulnerability stems from the plugin's failure to require POST requests for multiple HTTP endpoints that implement connection and authentication tests. This security flaw has been assigned a CVSS v3.1 base score of 4.3 MEDIUM, with the vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N. The vulnerability affects the plugin's HTTP endpoints that handle connection and authentication testing functionality (Jenkins Advisory).

This vulnerability allows attackers to perform connection tests, potentially connecting to attacker-specified or previously configured Active Directory servers using attacker-specified credentials. The impact is primarily related to unauthorized connection attempts and potential credential exposure (Jenkins Advisory).

The vulnerability is exploitable through cross-site request forgery attacks. An attacker can craft malicious requests that, when triggered by an authenticated user, can execute connection tests with attacker-controlled parameters (Jenkins Advisory).

The vulnerability has been fixed in Active Directory Plugin version 2.20, which now requires POST requests for the affected HTTP endpoints. Users are advised to upgrade to this version or later to address the security issue. The fix ensures proper request validation for connection and authentication test endpoints (Jenkins Advisory).