CVE-2020-2234: 
Java vulnerability analysis and mitigation

CVE-2020-2234 is a high severity vulnerability discovered in Jenkins Pipeline Maven Integration Plugin versions 3.8.2 and earlier. The vulnerability was disclosed on August 12, 2020, and affects the permission check mechanism in the plugin. The issue allows users with Overall/Read access to Jenkins to connect to an attacker-specified JDBC URL using attacker-specified credentials IDs obtained through another method (Jenkins Advisory, OSS Security).

The vulnerability stems from a missing permission check in a method implementing form validation within the Pipeline Maven Integration Plugin. This security flaw is tracked alongside CVE-2020-2235 (CSRF) as part of SECURITY-1794 (2). The vulnerability has a CVSS v3.1 Base Score of 6.5 MEDIUM (Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N) (NVD).

The vulnerability enables attackers with Overall/Read access to Jenkins to connect to attacker-specified JDBC URLs using credentials IDs that were obtained through other means. This could potentially lead to the capture of credentials stored in Jenkins, representing a significant security risk to the system (Jenkins Advisory).

The vulnerability can be exploited by users who have Overall/Read access to Jenkins. The attack requires the ability to specify JDBC URLs and leverage credentials IDs that were obtained through other methods. The form validation method's lack of proper permission checks makes it easier to exploit (Jenkins Advisory).

The vulnerability was patched in Pipeline Maven Integration Plugin version 3.8.3. The fix implements proper permission checks requiring POST requests and Job/Configure permission for the affected form validation method. Users are strongly advised to upgrade to this version or later to mitigate the risk (Jenkins Advisory).