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Advisories

Calero VeraSMART < 2022 R1 Static IIS Machine Keys Enable ViewState RCE

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severity
critical
date
Affecting

  • VeraSMART < 2022 R1

CWE
  • CWE-321 Use of Hard-coded Cryptographic Key
CVSS
9.3
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Credit
Victor A. Morales, Senior Pentester Team Leader, GM Sectec, Corp., Jan A. Rodriguez, Pentester Jr., GM Sectec, Corp.
Description
Calero VeraSMART versions prior to 2022 R1 use static ASP.NET/IIS machineKey values configured for the VeraSMART web application and stored in C:\\Program Files (x86)\\Veramark\\VeraSMART\\WebRoot\\web.config. An attacker who obtains these keys can craft a valid ASP.NET ViewState payload that passes integrity validation and is accepted by the application, resulting in server-side deserialization and remote code execution in the context of the IIS application.

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