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Advisories

PACSgear MediaWriter 5.2.1 Unauthenticated RCE via .NET Remoting TCP Service

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severity
critical
date
Affecting

  • PACSgear MediaWriter <= 5.2.1

  • An affected version range remains undefined

CWE
  • CWE-306 Missing Authentication for Critical Function
  • CWE-502 Deserialization of Untrusted Data
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, GM Sectec, Corp.
Description
PACSgear MediaWriter 5.2.1 exposes a .NET Remoting TCP service on port 9000 via PacsgearMediaServerEngine.dll, registered with ObjectURIs RemoteObj and UIRemoteObj, without any authentication requirement. By exploiting the MarshalByRefObject object unmarshalling technique and implementing .NET WebClient class methods, an unauthenticated remote attacker can read and write arbitrary files on the host filesystem. The ObjectURIs are identical across all installations by default. Chaining the arbitrary file write primitive with DLL hijacking opportunities in the MediaWriter service (which runs as NT Authority\\SYSTEM and loads missing DLLs such as CRYPTBASE.DLL from the application directory) enables unauthenticated remote code execution as SYSTEM upon service restart.

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