Stored XSS in Simple Nivo Slider WordPress Plugin Allows Script Injection

Mitigation Strategies

To mitigate this vulnerability, immediately update the Simple Nivo Slider plugin to a version later than 0.5.6 where the vulnerability is fixed. Additionally, restrict Contributor-level and above users from injecting untrusted content until the update is applied. Consider disabling or removing the plugin if an update is not available. Monitor and sanitize any shortcode parameters, especially the 'id' parameter, to prevent stored cross-site scripting attacks.

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Executive Summary

The Simple Nivo Slider plugin for WordPress has a Stored Cross-Site Scripting (XSS) vulnerability in the 'id' shortcode parameter in all versions up to 0.5.6. This occurs because the plugin does not properly sanitize input or escape output, allowing authenticated users with Contributor-level access or higher to inject malicious scripts into pages. These scripts execute whenever any user views the infected page.

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Impact Analysis

This vulnerability can allow attackers with Contributor-level access to inject malicious scripts into web pages, which will execute in the browsers of users who visit those pages. This can lead to theft of user data, session hijacking, defacement, or other malicious actions, potentially compromising the security and integrity of the affected website and its users.

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Detection Guidance

This vulnerability involves Stored Cross-Site Scripting (XSS) via the 'id' shortcode parameter in the Simple Nivo Slider WordPress plugin versions up to 0.5.6. To detect it, you can check if your WordPress site is running the Simple Nivo Slider plugin version 0.5.6 or earlier. Additionally, you can search for usage of the shortcode [snivo] with an 'id' parameter containing suspicious script tags or payloads in post content or pages. There are no specific commands provided in the resources, but you can use WP-CLI commands to list installed plugins and their versions, for example: `wp plugin list` to check the plugin version. To find posts or pages containing the vulnerable shortcode with suspicious input, you might run a database query like: `SELECT ID, post_content FROM wp_posts WHERE post_content LIKE '%[snivo id=%<script>%'` to identify injected scripts. Monitoring HTTP requests for unusual script payloads in parameters related to the slider shortcode could also help detect exploitation attempts. [2]

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