CVE-2022-29430 in PNG to JPG Plugin
Summary
by MITRE • 05/21/2022
Cross-Site Scripting (XSS) vulnerability in KubiQ's PNG to JPG plugin
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Analysis
by VulDB Data Team • 05/27/2022
The CVE-2022-29430 vulnerability represents a critical cross-site scripting flaw discovered in KubiQ's PNG to JPG plugin, which operates within content management systems and web applications that process image conversions. This vulnerability specifically affects the plugin's handling of user-supplied input during the conversion process from png to jpg formats, creating a pathway for malicious actors to inject persistent or reflected scripts into web applications. The flaw exists in the plugin's parameter validation and output encoding mechanisms, where insufficient sanitization allows attackers to execute arbitrary javascript code in the context of a victim's browser session.
The technical implementation of this vulnerability stems from improper input validation within the plugin's image processing pipeline, particularly when handling file names, metadata, or user-provided parameters during the conversion workflow. Attackers can exploit this by uploading specially crafted png files or manipulating conversion parameters to inject malicious javascript payloads. The vulnerability manifests as a reflected or stored XSS depending on how the plugin processes and stores the converted image data, potentially allowing attackers to hijack user sessions, deface web applications, or redirect users to malicious sites. This flaw aligns with CWE-79, which categorizes cross-site scripting vulnerabilities as weaknesses in input validation and output encoding.
The operational impact of CVE-2022-29430 extends beyond simple data theft or defacement, as it provides attackers with a persistent vector for more sophisticated attacks within compromised web environments. An attacker who successfully exploits this vulnerability can execute arbitrary code in the context of a user's browser, potentially accessing sensitive cookies, session tokens, or personal information stored in the browser's memory. The vulnerability's exploitation can lead to account takeovers, data exfiltration, and establishment of persistent backdoors within the target application. According to ATT&CK framework, this vulnerability maps to T1566 (Phishing) and T1059 (Command and Scripting Interpreter) techniques, as it enables attackers to deliver malicious payloads through web interfaces and execute code remotely.
Mitigation strategies for this vulnerability require immediate patching of the affected plugin to ensure proper input validation and output encoding mechanisms are implemented. System administrators should implement comprehensive input sanitization routines that validate and escape all user-supplied data before processing, particularly during image conversion operations. The remediation process should include enforcing Content Security Policy headers to prevent unauthorized script execution, implementing proper output encoding for all dynamic content, and conducting regular security assessments of third-party plugins. Additionally, network monitoring should be enhanced to detect unusual image processing activities that may indicate exploitation attempts, while user access controls should be reviewed to limit the ability of untrusted users to upload or manipulate files within the application environment.