Fortinet FortiAuthenticator 5.3.0 Referer Header cross site scripting

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CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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4.8$0-$5k0.00

A vulnerability was found in Fortinet FortiAuthenticator 5.3.0. It has been declared as problematic. Affected by this vulnerability is an unknown functionality. The manipulation as part of a Referer Header leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. As an impact it is known to affect integrity. An attacker might be able to inject arbitrary html and script code into the web site. This would alter the appearance and would make it possible to initiate further attacks against site visitors. The summary by CVE is:

A cross-site scripting (XSS) vulnerability in Fortinet FortiAuthenticator below 5.3.0 versions "CSRF validation failure" page allows attacker to execute unauthorized script code via inject malicious scripts in HTTP referer header.

The bug was discovered 05/29/2018. The weakness was presented 05/31/2018 (Website). It is possible to read the advisory at fortiguard.com. This vulnerability is known as CVE-2018-9186 since 04/02/2018. The attack can be launched remotely. The successful exploitation needs a single authentication. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

The vulnerability was handled as a non-public zero-day exploit for at least 2 days. During that time the estimated underground price was around $0-$5k.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at SecurityFocus (BID 104371).

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VulDB Meta Base Score: 4.8
VulDB Meta Temp Score: 4.8

VulDB Base Score: 3.5
VulDB Temp Score: 3.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.1
NVD Vector: 🔍

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VulDB Base Score: 🔍
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Exploitinginfoedit

Class: Cross site scripting
CWE: CWE-79
ATT&CK: T1059.007

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

Price Prediction: 🔍
Current Price Estimation: 🔍

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Countermeasuresinfoedit

Recommended: no mitigation known
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Timelineinfoedit

04/02/2018 🔍
05/29/2018 +57 days 🔍
05/31/2018 +1 days 🔍
05/31/2018 +0 days 🔍
05/31/2018 +0 days 🔍
06/01/2018 +1 days 🔍
02/10/2020 +619 days 🔍

Sourcesinfoedit

Vendor: https://www.fortinet.com/

Advisory: fortiguard.com
Status: Not defined
Confirmation: 🔍

CVE: CVE-2018-9186 (🔍)
SecurityFocus: 104371 - Fortinet FortiAuthenticator CVE-2018-9186 Cross Site Scripting Vulnerability

Entryinfoedit

Created: 06/01/2018 10:41 AM
Updated: 02/10/2020 05:24 PM
Changes: (4) vulnerability_discoverydate advisory_confirm_url source_securityfocus_date source_securityfocus_class
Complete: 🔍

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