what you don't know can hurt you

Register | Login

FilesNewsUsersAuthors

Home Files News &[SERVICES_TAB]About Contact Add New

Showing 1 - 1 of 1

Files from AssetNote

Sitecore Experience Platform (XP) Remote Code Execution

Posted Nov 16, 2021

Authored by gwillcox-r7, AssetNote | Site metasploit.com

This Metasploit module exploits a deserialization vulnerability in the Report.ashx page of Sitecore XP 7.5 to 7.5.2, 8.0 to 8.0.7, 8.1 to 8.1.3, and 8.2 to 8.2.7. Versions 7.2.6 and earlier and 9.0 and later are not affected. The vulnerability occurs due to Report.ashx's handler, located in Sitecore.Xdb.Client.dll under the Sitecore.sitecore.shell.ClientBin.Reporting.Report definition, having a ProcessRequest() handler that calls ProcessReport() with the context of the attacker's request without properly checking if the attacker is authenticated or not. This request then causes ReportDataSerializer.DeserializeQuery() to be called, which will end up calling the DeserializeParameters() function of Sitecore.Analytics.Reporting.ReportDataSerializer, if a "parameters" XML tag is found in the attacker's request. Then for each subelement named "parameter", the code will check that it has a name and if it does, it will call NetDataContractSerializer().ReadObject on it. NetDataContractSerializer is vulnerable to deserialization attacks and can be trivially exploited by using the TypeConfuseDelegate gadget chain. By exploiting this vulnerability, an attacker can gain arbitrary code execution as the user that IIS is running as, aka NT AUTHORITY\NETWORK SERVICE. Users can then use technique 4 of the "getsystem" command to use RPCSS impersonation and get SYSTEM level code execution.

tags | exploit, arbitrary, shell, code execution

advisories | CVE-2021-42237

SHA-256 | 37520d596ad5e8973bf7abf8600f04a5fcf14f78a72969dd7133167779137a26

Download | Favorite | View