CVE-2022-25207

Vulnerability

The Chef Sinatra Plugin (sinatra-chef-builder-plugin) versions 1.20 and earlier contain a cross-site request forgery (CSRF) vulnerability [1][3]. This allows an attacker to trick an authenticated Jenkins user into performing unintended actions. Specifically, the plugin does not require a CSRF token for certain endpoints, enabling an attacker to craft a malicious request that causes Jenkins to send an HTTP request to an attacker-controlled URL and parse the XML response [1].

Exploitation

An attacker must first convince a Jenkins user with sufficient permissions (e.g., a user who can configure the plugin) to visit a malicious web page or click a crafted link while authenticated to Jenkins. The attacker then leverages the CSRF to make Jenkins send an HTTP request to an attacker-specified URL and parse the returned XML content [1]. No additional authentication is required beyond the victim's session.

Impact

Successful exploitation allows the attacker to have Jenkins send an HTTP request to an arbitrary URL and parse its XML response. This could lead to information disclosure if the response contains sensitive data, or potentially enable further attacks depending on how the parsed XML is used. The exact impact is limited to the ability to trigger outbound HTTP requests and XML parsing; no direct remote code execution is described in the available references [1][3].

Mitigation

As of the Jenkins Security Advisory 2022-02-15, no fixed version of the Chef Sinatra Plugin has been released [1][2]. Users are advised to disable the plugin if not needed, or restrict access to Jenkins to trusted users only. The plugin is listed as having an unresolved security issue [2]. No workaround is provided in the references.