A vulnerability was found in ValidFormBuilder 4.5.4 and classified as critical. This issue affects the function unserialize of the component File System. The manipulation as part of a System Command leads to a injection vulnerability. Using CWE to declare the problem leads to CWE-74. The software constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

ValidFormBuilder version 4.5.4 contains a PHP Object Injection vulnerability in Valid Form unserialize method that can result in Possible to execute unauthorised system commands remotely and disclose file contents in file system.

The bug was discovered 02/09/2018. The weakness was shared 02/09/2018 (GitHub Repository). It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2018-1000059 since 02/09/2018. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1055 according to MITRE ATT&CK.

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

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