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Cross Site Scripting Vulnerability on "Import subscribers" feature in PHPList 3.5.4 upload file SVG. #678

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Songohan22 opened this issue Jun 7, 2020 · 2 comments

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@Songohan22
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Describe the bug
An authenticated malicious user can take advantage of a Stored XSS vulnerability in the "Import subscribers" feature.
To Reproduce
Steps to reproduce the behavior:

  1. Log into the panel.
  2. Go to "/admin/?page=import2&tk=93e3e3e3bbd0bd48b788a384c549813b"
  3. Click "Browse"
  4. Import payload file SVG:
    image
  5. Click button "Import"
  6. Click select "Email".
  7. Click button "CONTINUE"
  8. View the preview to trigger XSS.
  9. View the preview to get in request and such Stored XSS.

Expected behavior
The removal of script tags is not sufficient to prevent an XSS attack. You must HTML Entity encode any output that is stored back to the page.

Impact
Commonly include transmitting private data, like cookies or other session information, to the attacker, redirecting the victim to web content controlled by the attacker, or performing other malicious operations on the user’s machine under the guise of the vulnerable site.
Screenshots
phplist222
phplist223
phplist224
Trigger XSS
phplist_final
Desktop (please complete the following information):

  • OS: Ubuntu
  • Browser: Firefox
  • Version: 76.0.1
@Songohan22
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Hi @michield @suelaP
Please review it! Thanks

@michield
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This is resolved with bf445db

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