CVE-2023-32995

Vulnerability

Overview

CVE-2023-32995 is a cross-site request forgery (CSRF) vulnerability in the Jenkins SAML Single Sign On (SSO) Plugin, versions 2.0.0 and earlier. The plugin fails to require a CSRF token or other validation for requests that trigger an HTTP POST to miniOrange's API for sending emails. This allows an attacker to craft a malicious request that, when executed by an authenticated Jenkins user, sends a POST with attacker-controlled JSON content to the miniOrange email service [1][2].

Exploitation

Prerequisites

To exploit this vulnerability, an attacker must trick a Jenkins user with sufficient permissions (typically an administrator) into clicking a crafted link or visiting a malicious web page while authenticated to Jenkins. The attacker does not need direct access to the Jenkins instance; the CSRF attack leverages the victim's browser to send the forged request. The request is sent to the Jenkins server, which then forwards it to miniOrange's API without proper CSRF protection [1].

Impact

Successful exploitation allows the attacker to send arbitrary emails through the miniOrange API, using the Jenkins server's configured email settings. This could be used for phishing campaigns, spam, or other malicious email-based attacks, potentially damaging the organization's reputation or compromising other systems. The vulnerability does not directly allow code execution or data theft from Jenkins, but the email abuse can have significant security implications [2].

Mitigation

Jenkins has released a security advisory for this vulnerability [1]. Users should update the SAML SSO Plugin to a version that includes a fix (if available) or apply the recommended workaround, such as disabling the plugin or restricting access to Jenkins. As of the advisory date (2023-05-16), no patch version is explicitly mentioned, but users are advised to follow Jenkins security best practices and monitor for updates [1].