CVE-2020-35570 in mymbCONNECT24
Summary
by MITRE • 02/16/2021
An issue was discovered in MB CONNECT LINE mymbCONNECT24 and mbCONNECT24 through 2.6.2. An unauthenticated attacker is able to access files (that should have been restricted) via forceful browsing.
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Analysis
by VulDB Data Team • 03/02/2021
The vulnerability identified as CVE-2020-35570 affects MB CONNECT LINE mymbCONNECT24 and mbCONNECT24 versions up to 2.6.2, representing a critical access control flaw that allows unauthenticated attackers to bypass authentication mechanisms and access restricted files through forceful browsing techniques. This issue stems from inadequate input validation and insufficient authorization checks within the application's file access controls, creating a pathway for malicious actors to directly access sensitive resources without proper authentication credentials. The vulnerability manifests when attackers can manipulate URL parameters or directly request specific file paths that should normally be protected behind authentication barriers, effectively undermining the application's security model.
This weakness directly corresponds to CWE-284, which describes improper access control vulnerabilities where systems fail to properly enforce access restrictions on resources. The technical implementation flaw involves the application's failure to validate whether a user has proper authorization before serving requested files, allowing attackers to exploit predictable file paths or manipulate application state to gain unauthorized access. The forceful browsing technique leverages the application's lack of proper access validation, enabling attackers to traverse the file system or access restricted endpoints simply by constructing appropriate requests. This vulnerability operates at the application layer and can be exploited through standard web application attacks, making it particularly dangerous as it requires no specialized tools or techniques beyond basic web browsing capabilities.
The operational impact of this vulnerability is significant, as it exposes sensitive data and system resources that should remain protected from unauthorized access. Attackers can potentially access configuration files, user data, system logs, or other confidential information that should only be available to authenticated administrators or authorized users. The vulnerability affects the confidentiality and integrity of the system, as unauthorized access to restricted files can lead to data breaches, system compromise, or further exploitation opportunities. Organizations using affected versions of these applications face potential regulatory compliance violations, reputational damage, and increased risk of downstream attacks that could leverage the gained access to escalate privileges or move laterally within networks. The impact extends beyond immediate data exposure to include potential disruption of business operations and increased attack surface for more sophisticated threats.
Mitigation strategies for CVE-2020-35570 should prioritize immediate patching of affected software versions to the latest releases that contain proper access control implementations. Organizations must implement robust input validation and ensure that all file access requests undergo proper authentication and authorization checks before any content is served. Network segmentation and web application firewalls can provide additional layers of protection by monitoring and filtering suspicious access patterns. Regular security audits should validate that access controls are properly enforced throughout the application, with particular attention to file paths and endpoint access restrictions. The implementation of principle of least privilege access controls, regular penetration testing, and security configuration reviews should be conducted to prevent similar vulnerabilities from emerging in other application components. Additionally, security awareness training for developers should emphasize proper access control implementation and the importance of validating all user inputs to prevent similar forceful browsing exploits.