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Microsoft Exchange Powershell Remoting Deserialization leading to RCE (CVE-2023-21707)

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By Type destinationType, IFormat Provider formatProvider, out byte serializationData, Serialization TypeConverter.allowedTypes
| starlabs.sg
The first usage utilizes [method 4] to reconstruct the XamlReader type. To achieve this, the custom conversion method Microsoft.Exchange.Data.SerializationTypeConverter.ConvertFrom() -> DeserializeObject() is employed, which uses BinaryFormatter with a whitelist to deserialize data. If the deserialize type happens to be a System.Type, the target type would be System.UnitySerializationHolder which is also on the whitelist.
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