CVE-2020-2117: 
Java vulnerability analysis and mitigation

CVE-2020-2117 is a security vulnerability discovered in the Pipeline GitHub Notify Step Plugin for Jenkins, disclosed on February 12, 2020. The vulnerability is characterized by missing permission checks in a method implementing form validation, affecting versions 1.0.4 and earlier of the plugin (Jenkins Advisory).

The vulnerability stems from a missing permission check implementation in the form validation method of the Pipeline GitHub Notify Step Plugin. This security flaw allows users with Overall/Read access to Jenkins to connect to an attacker-specified URL using attacker-specified credentials IDs obtained through another method. The vulnerability was rated as High severity and was fixed in version 1.0.5 of the plugin, which implemented proper permission checks requiring Item/Configure permission and POST requests for form validation (Jenkins Advisory).

The vulnerability enables users with basic Overall/Read access to Jenkins to potentially capture credentials stored in the Jenkins system. This could lead to unauthorized access to sensitive credentials and potential compromise of connected systems or services (Jenkins Advisory).

The vulnerability was addressed in Pipeline GitHub Notify Step Plugin version 1.0.5. The fix implements proper permission checks requiring Item/Configure permission for form validation methods and enforces POST requests. Users should upgrade to this version or later to mitigate the vulnerability (Jenkins Advisory).

The vulnerability was reported by Thomas de Grenier de Latour and was part of a larger security advisory that addressed multiple Jenkins plugin vulnerabilities. The Jenkins project acknowledged the discovery in their security advisory (Jenkins Advisory).