CVE-2024-33449 in PDFMyURL
Summary
by MITRE • 04/29/2024
An SSRF issue in the PDFMyURL service allows a remote attacker to obtain sensitive information and execute arbitrary code via a POST request in the url parameter
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Analysis
by VulDB Data Team • 04/29/2024
The CVE-2024-33449 vulnerability represents a critical server-side request forgery flaw within the PDFMyURL service that fundamentally compromises the security posture of affected systems. This vulnerability resides in the service's handling of URL parameters within POST requests, creating an attack vector that enables remote adversaries to manipulate the application's behavior beyond its intended scope. The flaw essentially allows attackers to trick the service into making requests to internal resources or external malicious endpoints, thereby bypassing normal access controls and security boundaries that typically protect sensitive information and system components.
The technical implementation of this vulnerability stems from inadequate input validation and sanitization within the PDFMyURL service's URL parameter processing mechanism. When a POST request is submitted with a malicious url parameter, the service fails to properly validate or restrict the destinations to which it will make subsequent requests. This weakness creates a pathway for attackers to specify internal network addresses, loopback interfaces, or even external domains under their control, enabling them to harvest sensitive data from internal systems or redirect traffic to malicious endpoints. The vulnerability operates at the application layer and can be exploited through standard web request mechanisms without requiring elevated privileges or specialized tools.
The operational impact of this vulnerability extends far beyond simple information disclosure, as it provides attackers with the capability to execute arbitrary code on the affected system. This occurs through the exploitation of the SSRF flaw to reach internal services that may be vulnerable to additional attack vectors, or by redirecting requests to malicious endpoints that can deliver payloads designed to compromise the system. Attackers can leverage this vulnerability to conduct reconnaissance activities, exfiltrate sensitive data, perform lateral movement within network environments, or establish persistent access points. The potential for remote code execution transforms this vulnerability from a mere information disclosure issue into a severe compromise that can lead to full system takeover and data breaches.
Organizations affected by CVE-2024-33449 should implement immediate mitigations including strict input validation for URL parameters, implementation of allowlists for permitted destinations, and deployment of network segmentation controls to limit access to sensitive internal resources. The vulnerability aligns with CWE-918, which specifically addresses server-side request forgery vulnerabilities, and maps to ATT&CK technique T1190 for exploiting vulnerabilities in web applications. Security measures should include configuring web application firewalls to detect and block suspicious URL patterns, implementing proper access controls for internal services, and conducting thorough network monitoring to identify unauthorized requests originating from the affected service. Regular security assessments and penetration testing should be performed to identify similar vulnerabilities within the broader application ecosystem and ensure comprehensive protection against similar attack vectors.