A vulnerability was found in TONNET TAT-76 and TAT-77 (version now known). It has been classified as critical. Affected is some unknown processing of the component Patch File Handler. The manipulation with an unknown input leads to a command injection vulnerability. CWE is classifying the issue as CWE-77. The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

DVR firmware in TAT-76 and TAT-77 series of products, provided by TONNET do not properly verify patch files. Attackers can inject a specific command into a patch file and gain access to the system.

The weakness was disclosed 02/27/2020. This vulnerability is traded as CVE-2020-3924 since 12/20/2019. The exploitability is told to be difficult. It is possible to launch the attack remotely. Additional levels of successful authentication are required for exploitation. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1202 by the MITRE ATT&CK project.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The entry VDB-150701 is pretty similar.

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• TONNET

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• TAT-76
• TAT-77

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