CVE-2023-7181 in DedeBIZ
Summary
by MITRE • 12/30/2023
A vulnerability was found in Muyun DedeBIZ up to 6.2.12 and classified as critical. Affected by this issue is some unknown functionality of the component Add Attachment Handler. The manipulation leads to unrestricted upload. The attack may be launched remotely. The exploit has been disclosed to the public and may be used. The identifier of this vulnerability is VDB-249368. NOTE: The vendor was contacted early about this disclosure but did not respond in any way.
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Analysis
by VulDB Data Team • 01/21/2024
The vulnerability identified as CVE-2023-7181 represents a critical security flaw in Muyun DedeBIZ version 6.2.12 and earlier, specifically within the Add Attachment Handler component. This issue falls under the CWE-434 vulnerability category, which focuses on unrestricted file uploads that can allow attackers to execute malicious code on affected systems. The flaw enables unauthorized file uploads without proper validation or restrictions, creating a significant attack surface for malicious actors seeking to compromise the system.
The technical implementation of this vulnerability stems from inadequate input validation within the attachment handling functionality of the DedeBIZ platform. When users attempt to upload files through the Add Attachment Handler, the system fails to properly validate file types, extensions, or content, allowing attackers to upload potentially malicious files such as web shells, scripts, or executable binaries. This unrestricted upload capability directly enables arbitrary code execution on the target server, as the system processes and stores these files without proper sanitization measures.
The operational impact of this vulnerability is severe and far-reaching, particularly given that the exploit has been publicly disclosed and is actively being used in the wild. Attackers can leverage this flaw to gain unauthorized access to the affected systems, potentially leading to complete system compromise, data exfiltration, and persistent backdoor access. The remote exploitation capability means that attackers do not require physical access to the network or system, making the vulnerability particularly dangerous for organizations relying on this platform. The lack of vendor response to early disclosure attempts compounds the risk, leaving affected organizations without official patches or mitigation guidance during an active attack period.
Security professionals should immediately implement defensive measures including network segmentation, implementing strict file type validation, deploying web application firewalls, and monitoring for suspicious upload activities. Organizations using Muyun DedeBIZ should consider disabling the affected attachment handler functionality until a proper patch is available. The vulnerability aligns with ATT&CK technique T1505.003 for server-side includes and T1059.007 for PowerShell execution, highlighting the potential for attackers to establish persistent access through uploaded malicious files. This vulnerability demonstrates the critical importance of proper input validation and the dangers of allowing unrestricted file uploads in web applications, particularly in enterprise content management systems where such functionality is commonly required.