CVE-2018-11688

Vulnerability

Ignite Realtime Openfire versions before 3.9.2 contain a cross-site scripting (XSS) vulnerability caused by improper validation of user-supplied input. The vulnerable code path is in the plugin-related JSP pages, where dynamic content such as plugin icons, names, readme URLs, and changelog URLs are inserted into HTML attributes and body without escaping [2]. Specifically, the commit fixing the issue applies StringUtils.escapeForXML() and StringUtils.escapeHTMLTags() to user-controlled plugin data before rendering in the admin console [2].

Exploitation

A remote attacker can exploit this vulnerability by crafting a malicious URL that includes XSS payloads in plugin metadata (e.g., plugin name, icon URL). If an authenticated administrator clicks the crafted link or views the plugin page containing the malicious plugin, the injected script executes in the context of the Openfire admin web interface [1][3]. No user interaction beyond clicking the URL is required for exploitation.

Impact

Successful exploitation allows the attacker to execute arbitrary JavaScript in the victim's browser session within the security context of the Openfire web application. This can lead to theft of cookie-based authentication credentials, enabling the attacker to impersonate the administrator and perform actions on the Openfire server with administrative privileges [1][3].

Mitigation

The vulnerability is fixed in Openfire version 3.9.2, released on June 13, 2018 [3][4]. The fix is implemented in commit ed3492a of the development repository, which adds proper output encoding using StringUtils.escapeForXML() and StringUtils.escapeHTMLTags() for plugin display fields [2]. Users should upgrade to version 3.9.2 or later. There is no known workaround for earlier versions.