CVE-2023-1780 in Companion Sitemap Generator Plugin
Summary
by MITRE • 07/10/2023
The Companion Sitemap Generator WordPress plugin before 4.5.3 does not sanitise and escape some parameters before outputting them back in pages, leading to Reflected Cross-Site Scripting which could be used against high privilege users such as admin.
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Analysis
by VulDB Data Team • 07/27/2023
The Companion Sitemap Generator WordPress plugin vulnerability represents a critical security flaw that exposes websites to reflected cross-site scripting attacks. This vulnerability affects versions prior to 4.5.3 and specifically targets the plugin's handling of user-supplied parameters within the WordPress ecosystem. The flaw resides in the plugin's failure to properly sanitise and escape input data before rendering it back to users in web pages, creating an environment where malicious scripts can be executed within the context of privileged user sessions.
The technical implementation of this vulnerability stems from improper input validation and output encoding practices within the plugin's codebase. When users interact with the sitemap generator functionality, the plugin accepts various parameters that should be treated as untrusted input. These parameters are processed and subsequently displayed in web responses without adequate sanitisation measures. The absence of proper escaping mechanisms means that malicious actors can inject script code into parameters, which then gets executed when the page is rendered for legitimate users with administrative privileges. This reflective nature of the vulnerability means that the malicious payload is reflected back to the user through the web application's response, making it particularly dangerous as it can be delivered via crafted URLs or form submissions.
The operational impact of this vulnerability extends beyond simple data theft or defacement, as it specifically targets high-privilege users including administrators. When an attacker successfully exploits this vulnerability, they can execute arbitrary scripts within the context of an admin session, potentially gaining complete control over the affected WordPress installation. This elevated access level allows for malicious activities such as modifying or deleting content, installing malware, changing user permissions, or extracting sensitive data from the website. The vulnerability is particularly concerning because it requires minimal user interaction to exploit, as administrators might inadvertently click on malicious links or be tricked into visiting compromised pages.
Security professionals should note that this vulnerability aligns with CWE-79 which describes Cross-Site Scripting flaws in software applications. The specific manifestation of this weakness in the WordPress plugin ecosystem demonstrates how third-party components can introduce significant security risks to otherwise secure platforms. From an adversarial perspective, this vulnerability maps to ATT&CK technique T1566.001 which covers Spearphishing Attachment, as attackers could craft malicious URLs that exploit this vulnerability to gain access to administrative accounts. Organizations should prioritize immediate remediation by updating to version 4.5.3 or later of the Companion Sitemap Generator plugin, while also implementing additional defensive measures such as web application firewalls and monitoring for suspicious parameter usage patterns. Regular security audits of WordPress plugins and themes remain essential for maintaining overall platform security posture.
The broader implications of this vulnerability highlight the critical importance of input validation and output escaping in web application development. WordPress plugins that fail to properly sanitise user input create dangerous attack surfaces that can be leveraged by threat actors targeting high-value administrative accounts. This case study reinforces the need for comprehensive security testing of third-party components and demonstrates how seemingly minor implementation flaws can result in significant security breaches. Organizations should maintain updated inventories of all installed plugins and regularly verify their security status through vulnerability scanning tools and security advisories from trusted sources.