Overview
The cybersecurity landscape is continually evolving, with new vulnerabilities being identified and exploited by malicious actors. One such vulnerability, CVE-2025-52362, poses a significant threat to systems running PHProxy version 1.1.1 and prior. This Server-Side Request Forgery (SSRF) vulnerability exists in the URL processing functionality of PHProxy. If exploited, this vulnerability can potentially compromise the system or lead to data leakage.
This vulnerability is particularly concerning due to its impact on entities using PHProxy, a popular proxy application used in many web environments. An unauthenticated, remote attacker could exploit this flaw, bypassing the input validation for the _proxurl parameter, thereby creating a potential security breach.
Vulnerability Summary
CVE ID: CVE-2025-52362
Severity: Critical (9.1 CVSS Severity Score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage
Affected Products
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Product | Affected Versions
PHProxy | 1.1.1 and prior
How the Exploit Works
The vulnerability lies in the URL processing functionality of PHProxy where the input validation for the _proxurl parameter can be bypassed. An attacker can exploit this by submitting a specially crafted URL. This action can trigger a Server-Side Request Forgery (SSRF) attack, enabling the attacker to force the server to make arbitrary requests on their behalf. This could lead to unauthorized actions, depending on the permissions of the application, potentially compromising the system or leading to data leakage.
Conceptual Example Code
Consider this conceptual example of how an attacker might exploit this vulnerability using a malicious HTTP request:
GET /phproxy/proxy.php?_proxurl=http://malicious.example.com HTTP/1.1
Host: target.example.com
User-Agent: attacker/1.0In this example, the attacker manipulates the _proxurl parameter to send a request to a malicious server, thereby exploiting the SSRF vulnerability. This could potentially lead to unauthorized actions or data leakage.
Mitigation and Prevention
The best way to mitigate this vulnerability is to apply the patch provided by the vendor. If the patch cannot be applied immediately, using a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) can serve as temporary mitigation. These tools can help detect and block malicious requests that attempt to exploit this vulnerability. Regularly updating and patching your systems is also essential for maintaining a secure environment.