CVE-2022-0288 in Ad Inserter Plugin
Summary
by MITRE • 02/21/2022
The Ad Inserter WordPress plugin before 2.7.10, Ad Inserter Pro WordPress plugin before 2.7.10 do not sanitise and escape the html_element_selection parameter before outputting it back in the page, leading to a Reflected Cross-Site Scripting
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Analysis
by VulDB Data Team • 02/25/2022
The vulnerability identified as CVE-2022-0288 affects the Ad Inserter WordPress plugin and its Pro variant versions prior to 2.7.10. This issue represents a classic reflected cross-site scripting vulnerability that occurs when user-supplied input is not properly sanitized or escaped before being rendered back to the browser. The specific parameter at risk is html_element_selection which is processed within the plugin's administrative interface. When an attacker crafts a malicious payload and convinces a user to click on a specially crafted link containing this payload, the script executes in the victim's browser context. The vulnerability stems from improper input validation and output escaping mechanisms within the plugin's codebase, creating an entry point for malicious script injection that can persist across user sessions.
The technical flaw manifests in how the plugin handles the html_element_selection parameter during its processing cycle. When administrators or users interact with the plugin's configuration interface, the parameter value is directly incorporated into the page output without appropriate sanitization measures. This failure to implement proper input validation and output escaping creates a pathway for attackers to inject malicious JavaScript code that executes in the context of the victim's browser. The vulnerability operates under CWE-79 which classifies improper neutralization of input during web page generation, specifically addressing reflected cross-site scripting conditions. The attack vector requires user interaction through a maliciously crafted URL that contains the XSS payload, making it a reflected XSS vulnerability that can be delivered through phishing emails or compromised websites.
The operational impact of CVE-2022-0288 extends beyond simple script execution as it can enable attackers to perform various malicious activities within the compromised user's browser session. An attacker could potentially steal session cookies, perform actions on behalf of the user, redirect to malicious websites, or even harvest sensitive information from the WordPress admin interface. The vulnerability affects the plugin's administrative functionality, potentially allowing attackers to manipulate ad insertion configurations or access restricted administrative features. This type of vulnerability can be particularly dangerous in environments where multiple administrators have access to the WordPress site, as it could enable privilege escalation or unauthorized modifications to the site's content delivery mechanisms. The reflected nature of the vulnerability means that the malicious payload must be delivered through external sources, making it less persistent than stored XSS but still highly exploitable in targeted attacks.
Mitigation strategies for CVE-2022-0288 primarily focus on updating the affected plugins to versions 2.7.10 or later where the sanitization and escaping issues have been addressed. WordPress administrators should immediately apply the patch released by the plugin developers to resolve the vulnerability. Additionally, implementing proper input validation and output escaping mechanisms within the plugin's codebase would prevent similar issues from occurring. Security measures such as content security policies can provide additional protection layers against reflected XSS attacks by restricting script execution from untrusted sources. Regular security audits of WordPress plugins and themes should be conducted to identify potential sanitization and escaping vulnerabilities. Organizations should also implement web application firewalls to detect and block malicious payloads attempting to exploit this type of vulnerability, aligning with ATT&CK technique T1566 which covers the use of malicious links for initial access through phishing or social engineering campaigns. The vulnerability highlights the critical importance of proper input sanitization and output escaping in web applications, particularly within content management systems where plugins often handle user-provided data without sufficient validation.