CVE-2024-1021 in Rebuild
Summary
by MITRE • 01/30/2024
A vulnerability, which was classified as critical, has been found in Rebuild up to 3.5.5. Affected by this issue is the function readRawText of the component HTTP Request Handler. The manipulation of the argument url leads to server-side request forgery. The attack may be launched remotely. The exploit has been disclosed to the public and may be used. VDB-252290 is the identifier assigned to this vulnerability.
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Analysis
by VulDB Data Team • 02/21/2024
The vulnerability identified as CVE-2024-1021 represents a critical server-side request forgery flaw within the Rebuild framework version 3.5.5 and earlier. This security weakness resides in the HTTP Request Handler component, specifically within the readRawText function that processes URL arguments. The vulnerability stems from insufficient input validation and sanitization of user-supplied URL parameters, creating an avenue for malicious actors to manipulate the application's behavior and potentially gain unauthorized access to internal systems. The flaw's classification as critical indicates the severe potential impact on system security and data integrity, with the vulnerability being remotely exploitable and already disclosed in public databases such as VDB-252290.
The technical implementation of this vulnerability allows attackers to construct malicious URL requests that bypass normal access controls and authentication mechanisms. When the readRawText function processes a manipulated URL argument, it fails to properly validate or sanitize the input before using it in HTTP requests to internal services. This creates a scenario where an attacker can craft requests that cause the vulnerable application to make HTTP requests to internal resources that should normally be inaccessible from external networks. The vulnerability specifically leverages the HTTP Request Handler's processing capabilities to redirect requests to internal systems, potentially enabling access to backend services, databases, or other internal components that are typically protected by network segmentation. This flaw directly maps to CWE-918, which describes server-side request forgery vulnerabilities where applications fail to properly validate and sanitize user-supplied URLs before using them in HTTP requests.
The operational impact of this vulnerability extends beyond simple unauthorized access, as it can enable attackers to perform reconnaissance activities against internal network infrastructure, potentially leading to further privilege escalation and lateral movement within the affected environment. Attackers can exploit this vulnerability to probe internal services, access sensitive data stored in backend systems, or even use the compromised application as a pivot point for attacking other systems within the network perimeter. The remote exploitability of this vulnerability means that attackers do not require physical access to the network or system to launch attacks, making it particularly dangerous in cloud environments or multi-tenant deployments where network isolation is crucial. Organizations utilizing Rebuild versions up to 3.5.5 face significant risk of unauthorized data access and potential system compromise, with the vulnerability potentially enabling advanced persistent threats to establish long-term presence within affected networks.
Mitigation strategies for CVE-2024-1021 should prioritize immediate patching of affected Rebuild installations to version 3.5.6 or later, which contains the necessary security fixes. Organizations should implement network-level controls including firewalls and access control lists to restrict access to internal services from the vulnerable application, particularly when external access to the HTTP Request Handler is not strictly required. Input validation and sanitization measures should be strengthened at the application level, with all URL parameters being properly validated against expected formats and ranges before processing. The implementation of a web application firewall can provide additional protection by monitoring and filtering suspicious HTTP requests that attempt to exploit this vulnerability. Security monitoring and incident response procedures should be enhanced to detect potential exploitation attempts, with network traffic analysis tools configured to identify unusual patterns of internal service access that might indicate successful exploitation. Organizations should also consider implementing network segmentation strategies to limit the potential impact of successful exploitation and reduce the attack surface available to malicious actors. The vulnerability's presence in the ATT&CK framework would likely be categorized under techniques related to server-side request forgery and privilege escalation, with defensive measures focusing on input validation controls and network segmentation to prevent lateral movement within compromised environments.