CVE-2017-18579 in corner-ad Plugin
Summary
by MITRE
The corner-ad plugin before 1.0.8 for WordPress has XSS.
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Analysis
by VulDB Data Team • 12/01/2023
The vulnerability identified as CVE-2017-18579 represents a cross-site scripting flaw within the corner-ad plugin for WordPress systems. This issue affects versions prior to 1.0.8 and stems from inadequate input validation and output sanitization mechanisms within the plugin's codebase. The flaw allows malicious actors to inject arbitrary JavaScript code into web pages viewed by other users, potentially compromising the security of WordPress installations that utilize this vulnerable plugin.
The technical implementation of this vulnerability occurs through improper handling of user-supplied data within the corner-ad plugin's functionality. When users interact with the plugin's administrative interfaces or when the plugin processes data for display, the application fails to adequately sanitize or escape input parameters before rendering them in web pages. This creates an environment where attackers can craft malicious payloads that execute in the context of other users' browsers, exploiting the trust relationship between the web application and its users.
From an operational impact perspective, this vulnerability presents significant risks to WordPress site administrators and their visitors. Attackers can leverage the XSS flaw to steal session cookies, perform unauthorized actions on behalf of users, redirect victims to malicious websites, or even escalate privileges within the affected WordPress environment. The vulnerability particularly threatens sites that rely heavily on user-generated content or administrative features, as these contexts often provide the most fertile ground for successful exploitation. The attack surface expands when considering that WordPress plugins often have broad access to site functionality and user data, making them attractive targets for adversaries seeking persistent access or data exfiltration.
The vulnerability aligns with CWE-79 Cross-site Scripting category, which specifically addresses the improper neutralization of input during web page generation, creating opportunities for malicious script injection. From an ATT&CK framework perspective, this vulnerability maps to T1566 Initial Access through the exploitation of web application vulnerabilities, and potentially T1059 Command and Control through the execution of malicious scripts on compromised systems. The exploitation typically requires minimal technical expertise, making it particularly dangerous as it can be leveraged by attackers with varying skill levels.
Mitigation strategies for CVE-2017-18579 center primarily on immediate plugin updates to version 1.0.8 or later, which contain the necessary patches to address the XSS vulnerability. Site administrators should conduct comprehensive vulnerability assessments to identify all instances of the affected plugin across their WordPress installations and ensure all users are updated. Additional defensive measures include implementing content security policies, regularly monitoring for unauthorized plugin modifications, and maintaining up-to-date security practices such as regular backups, secure file permissions, and network segmentation. Organizations should also consider implementing web application firewalls and intrusion detection systems to monitor for exploitation attempts targeting known vulnerabilities like this XSS flaw.