CVE-2020-2166: 
Java vulnerability analysis and mitigation

CVE-2020-2166 affects the Jenkins Pipeline: AWS Steps Plugin versions 1.40 and earlier. The vulnerability was discovered and disclosed on March 25, 2020. This security issue impacts the YAML parser configuration in the plugin, which affects Jenkins automation server environments using the AWS Steps Plugin (Jenkins Advisory, OSS Security).

The vulnerability stems from the plugin's YAML parser not being configured to prevent the instantiation of arbitrary types. This configuration oversight creates a remote code execution (RCE) vulnerability. The severity is rated as High with a CVSS v3.1 base score indicating significant risk. The vulnerability is tracked as SECURITY-1741 in Jenkins' security advisory system (Jenkins Advisory).

The vulnerability enables remote code execution (RCE) capabilities, allowing attackers who can provide YAML input files to the Pipeline: AWS Steps Plugin's build steps to execute arbitrary code on the affected system. This presents a significant security risk as it could lead to complete system compromise (Jenkins Advisory).

The vulnerability has been fixed in Pipeline: AWS Steps Plugin version 1.41, which configures the YAML parser to only instantiate safe types. Users should upgrade to this version or later to mitigate the vulnerability. The fix prevents the instantiation of arbitrary types through the YAML parser (Jenkins Advisory).