CVE-2024-56026 in Simple Proxy Plugin
Summary
by MITRE • 01/02/2025
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Greg Priday Simple Proxy allows Reflected XSS.This issue affects Simple Proxy: from n/a through 1.0.
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Analysis
by VulDB Data Team • 02/16/2025
This vulnerability represents a classic cross-site scripting flaw that exploits improper input sanitization during web page generation processes. The issue specifically manifests in the Greg Priday Simple Proxy application where user-supplied input is not adequately neutralized before being reflected back to clients. This creates an environment where malicious actors can inject arbitrary script code that executes in the context of other users' browsers. The vulnerability exists within the proxy's handling of web page generation, where input parameters are directly incorporated into output without proper encoding or validation mechanisms. The reflected nature of this XSS vulnerability means that malicious payloads are immediately reflected from the server back to the user's browser through HTTP response headers, query parameters, or form fields. This allows attackers to execute scripts in the victim's browser context, potentially leading to session hijacking, credential theft, or redirection to malicious sites. The vulnerability affects all versions of the Simple Proxy application from the initial release through version 1.0, indicating a fundamental flaw in the input processing pipeline that was not addressed in the software's development lifecycle. This issue directly maps to CWE-79 which defines improper neutralization of input during web page generation as a primary weakness leading to cross-site scripting attacks. The ATT&CK framework categorizes this under T1566.001 - Phishing, as attackers can leverage this vulnerability to craft malicious web pages that appear legitimate but execute unauthorized scripts in users' browsers. The impact of this vulnerability extends beyond simple script execution, as it can enable more sophisticated attacks including session manipulation, data exfiltration, and privilege escalation within the application's security boundaries. The reflected XSS nature means that exploitation requires user interaction with a maliciously crafted link, but once clicked, the payload executes automatically in the victim's browser without requiring additional user actions. This makes the vulnerability particularly dangerous in environments where users may encounter such links through email, web forums, or other social engineering vectors. The root cause lies in the application's failure to implement proper input validation and output encoding mechanisms, which are fundamental security controls recommended by the OWASP Top Ten Project and the NIST Cybersecurity Framework. Organizations using this proxy application should immediately implement mitigations including input sanitization, output encoding, and proper content security policies to prevent exploitation of this vulnerability. The vulnerability demonstrates a critical gap in the software's security architecture and highlights the importance of implementing comprehensive input validation at all points where user data enters the application's processing pipeline.