CVE-2022-30049 in Rebuild
Summary
by MITRE • 05/15/2022
A Server-Side Request Forgery (SSRF) in Rebuild v2.8.3 allows attackers to obtain the real IP address and scan Intranet information via the fileurl parameter.
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Analysis
by VulDB Data Team • 05/18/2022
The vulnerability identified as CVE-2022-30049 represents a critical Server-Side Request Forgery flaw in the Rebuild framework version 2.8.3. This vulnerability resides within the fileurl parameter handling mechanism, where the application fails to properly validate or sanitize user-supplied input before processing it as a remote URL. The flaw enables attackers to manipulate the application's behavior by redirecting server-side requests to internal network resources that would normally be inaccessible from external networks. The vulnerability stems from insufficient input validation and access control measures that allow arbitrary URLs to be processed without proper authorization checks.
The technical exploitation of this SSRF vulnerability occurs when an attacker submits a malicious fileurl parameter containing internal network addresses or protocols such as http://127.0.0.1, http://10.0.0.0/16, or file:// protocols. The application processes these requests without proper validation, resulting in the server making outbound connections to internal resources. This allows threat actors to enumerate internal network services, identify running applications, and potentially discover sensitive systems or services that should remain isolated from external access. The vulnerability operates at the application layer and specifically targets the file handling functionality of the Rebuild framework, creating a pathway for reconnaissance and further exploitation.
The operational impact of this vulnerability is significant as it provides attackers with the ability to perform internal network scanning and information gathering without requiring physical access or network-level privileges. Successful exploitation can lead to the discovery of internal services, database servers, application servers, and other network components that may contain sensitive data or provide additional attack vectors. This vulnerability directly aligns with CWE-918, which describes Server-Side Request Forgery vulnerabilities, and can be mapped to ATT&CK technique T1018 for Valid Accounts and T1046 for Network Service Scanning. The reconnaissance capabilities enabled by this flaw can precede more sophisticated attacks such as credential harvesting, privilege escalation, or lateral movement within the compromised network environment.
Mitigation strategies for CVE-2022-30049 should focus on implementing strict input validation and access control measures within the Rebuild framework. Organizations should immediately patch to versions that address this vulnerability, as the recommended solution involves updating the application to a secure release that properly validates and sanitizes the fileurl parameter. Additional defensive measures include implementing network-level restrictions such as firewalls that prevent outbound connections to internal network ranges, configuring application-level proxies that block access to internal resources, and implementing proper URL validation that rejects suspicious protocols or addresses. Security teams should also consider implementing network segmentation and monitoring solutions to detect unusual outbound traffic patterns that may indicate exploitation attempts. The vulnerability demonstrates the critical importance of input validation and proper access control in preventing unauthorized internal network access through web applications, highlighting the need for comprehensive security testing and continuous vulnerability assessment programs.