CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
SINGLE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:M/Au:S/C:N/I:P/A:N
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
AI Score
Confidence
High
EPSS
Percentile
49.6%
# Exploit Title: Kentico CMS 9.0-12.0.49 - Persistent Cross Site Scripting
# Exploit Author: Ataberk YAVUZER
# CVE: CVE-2019-19493
# Type: Webapps
# Vendor Homepage: https://www.kentico.com/
# Version: 9.0-12.0.49
# Date: 29-11-2019
#CVE Details: https://nvd.nist.gov/vuln/detail/CVE-2019-19493
Details
Persistent Cross Site Scripting vulnerability has been found on the
Admin/User Panel. Kentico before 12.0.50 allows file uploads in which the
Content-Type header is inconsistent with the file extension, leading to XSS.
# Steps to reproduce
1. Log in to Kentico Admin Panel with your credentials.
2. Browse to Profile Page.
3. Click to "Browse" button on Avatar section.
4. Select "avatar.svg" file which can be found on below.
5. Intercept the request before clicking to save button.
6. Change file name to "avatar.svg.png" and send the request. (MimeType
needs to be "image/xml+svg")
7. Kentico will generate an avatar link: "
http://example.kentico.com/admin/CMSPages/GetAvatar.aspx?avatarguid=<generated_avatar_uid>"
Send that link to another user.
8. An alert with cookie values will pop up.
#Content of the avatar.svg:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<svg xmlns="http://www.w3.org/2000/svg" onload="alert(document.cookie)"/>
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
SINGLE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:M/Au:S/C:N/I:P/A:N
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
AI Score
Confidence
High
EPSS
Percentile
49.6%