CVE-2012-1301 in Umbraco
Summary
by MITRE
The FeedProxy.aspx script in Umbraco 4.7.0 allows remote attackers to proxy requests on their behalf via the "url" parameter.
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
Analysis
by VulDB Data Team • 08/30/2020
The vulnerability identified as CVE-2012-1301 resides within the FeedProxy.aspx script of Umbraco version 4.7.0, representing a significant security weakness that enables remote attackers to exploit the system for unauthorized proxy operations. This flaw manifests through the improper handling of the "url" parameter, which creates an avenue for malicious actors to leverage the vulnerable application as an intermediary for their own network requests. The issue stems from the application's failure to validate or sanitize user-provided input before using it to construct proxy requests, effectively allowing attackers to redirect traffic through the compromised Umbraco instance.
This vulnerability operates under the broader category of insecure direct object references and improper input validation, aligning with CWE-20 and CWE-915 classifications that address weaknesses in input sanitization and object reference handling. The technical implementation flaw occurs when the FeedProxy.aspx script accepts the "url" parameter without adequate verification of its contents, permitting attackers to specify arbitrary destination URLs for proxying. The system processes these requests without sufficient authorization checks or destination validation, creating a pathway for attackers to potentially access internal network resources or perform unauthorized data exfiltration through the compromised proxy mechanism.
The operational impact of this vulnerability extends beyond simple unauthorized proxying, as it can enable attackers to conduct various malicious activities including internal network reconnaissance, data leakage, and potential lateral movement within network environments. Attackers can use this vulnerability to access systems that would otherwise be protected by network segmentation, effectively bypassing security controls that rely on external access restrictions. The vulnerability also poses risks for credential theft, as attackers may attempt to proxy requests to authentication endpoints or capture sensitive information during transit. Additionally, the compromised system can be used as a launching point for further attacks against other networked systems, making this vulnerability particularly dangerous in enterprise environments where Umbraco instances may be connected to critical internal infrastructure.
Organizations utilizing Umbraco 4.7.0 should implement immediate mitigations including input validation and sanitization of all parameters, particularly those used in proxy operations. The recommended approach involves implementing strict URL validation that verifies destination addresses against approved lists or patterns, while also implementing proper access controls and logging mechanisms to detect anomalous proxy behavior. Security controls should include network-level restrictions that prevent the proxy script from accessing internal resources, along with regular monitoring of proxy activities to identify potential exploitation attempts. The vulnerability also underscores the importance of keeping web applications updated, as newer versions of Umbraco have addressed similar issues through improved input validation and security hardening measures. Organizations should also consider implementing web application firewalls and network segmentation strategies to limit the potential impact of such vulnerabilities, while maintaining comprehensive security awareness training for developers to prevent similar issues in custom application development. This vulnerability demonstrates the critical need for robust input validation practices and proper security architecture design to prevent attackers from leveraging legitimate application functionality for malicious purposes, as outlined in the ATT&CK framework's proxying techniques and command and control patterns.