CVE-2020-7878 in VideoOffice
Summary
by MITRE • 12/28/2021
An arbitrary file download and execution vulnerability was found in the VideoOffice X2.9 and earlier versions (CVE-2020-7878). This issue is due to missing support for integrity check.
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Analysis
by VulDB Data Team • 12/31/2021
The vulnerability identified as CVE-2020-7878 represents a critical security flaw in VideoOffice X2.9 and earlier versions that enables attackers to execute arbitrary file downloads and subsequent code execution on affected systems. This weakness stems from insufficient validation mechanisms within the software's file handling processes, creating an exploitable condition that can be leveraged by malicious actors to compromise system integrity and potentially gain unauthorized access to sensitive data or network resources. The vulnerability specifically targets the application's failure to implement proper integrity checks during file download operations, which allows attackers to manipulate or replace legitimate files with malicious counterparts without detection.
This security weakness falls under the broader category of insecure file handling practices and can be classified according to CWE-22 as "Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')" combined with CWE-502 which addresses "Deserialization of Untrusted Data" in contexts where file integrity validation is missing. The vulnerability creates a pathway for attackers to bypass normal security controls by exploiting the absence of cryptographic checksums, digital signatures, or other verification mechanisms that should validate file authenticity before processing. The lack of integrity checking means that downloaded files can be modified by attackers without the system recognizing the tampering, effectively undermining the security model of the application.
The operational impact of CVE-2020-7878 extends beyond simple file corruption or unauthorized access, as it can lead to complete system compromise through code execution. Attackers can leverage this vulnerability to download malicious payloads such as backdoors, malware, or exploit frameworks that can establish persistent access to the affected system. The vulnerability is particularly dangerous because it can be exploited remotely without requiring authentication, making it an attractive target for automated attacks and large-scale exploitation campaigns. Additionally, the vulnerability can be chained with other exploits to escalate privileges, create persistence mechanisms, or pivot to other systems within the network, potentially leading to widespread compromise.
From a threat modeling perspective, this vulnerability aligns with ATT&CK technique T1195.001 which covers "Phishing for Information" and T1059.001 covering "Command and Scripting Interpreter" where attackers can use the downloaded malicious files to execute commands on the compromised system. Organizations using affected versions of VideoOffice should implement immediate mitigations including upgrading to patched versions, implementing network segmentation to limit access to vulnerable systems, and deploying intrusion detection systems to monitor for suspicious file download activities. The vulnerability also highlights the importance of implementing defense-in-depth strategies that include file integrity monitoring, application whitelisting, and regular security assessments to identify similar weaknesses in other applications and systems within the organization's infrastructure.