Fortinet FortiOS 5.0/5.2.12/5.4.6/5.6.2 Web Portal redir cross site scripting

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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4.3$0-$5k0.00

A vulnerability has been found in Fortinet FortiOS 5.0/5.2.12/5.4.6/5.6.2 (Firewall Software) and classified as problematic. Affected by this vulnerability is an unknown function of the component Web Portal. The manipulation of the argument redir as part of a Parameter leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. The summary by CVE is:

A Cross-site Scripting (XSS) vulnerability in Fortinet FortiOS 5.6.0 to 5.6.2, 5.4.0 to 5.4.6, 5.2.0 to 5.2.12, 5.0 and below versions under SSL VPN web portal allows an authenticated user to inject arbitrary web script or HTML in the context of the victim's browser via the login redir parameter. An URL Redirection attack may also be feasible by injecting an external URL via the affected parameter.

The bug was discovered 11/23/2017. The weakness was disclosed 11/29/2017 by Stefan Viehböck with SEC Consult as FG-IR-17-242 as confirmed advisory (Website). It is possible to read the advisory at fortiguard.com. The public release has been coordinated in cooperation with Fortinet. This vulnerability is known as CVE-2017-14186 since 09/07/2017. The attack can be launched remotely. The successful exploitation requires a single authentication. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK. The advisory points out:

A Cross-site Scripting (XSS) vulnerability in FortiOS SSL-VPN portal may allow an authenticated user to inject arbitrary web code or HTML in the context of the victim's browser via the login redir parameter. An URL Redirection Attack may also enable an authenticated user to redirect the victim to an arbitrary URL, via the redir parameter.

The vulnerability was handled as a non-public zero-day exploit for at least 4 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 104886 (Fortinet FortiOS <= 5.4 / 5.6.x < 5.6.8 / 6.0.x < 6.0.5 SSL VPN Web Portal login redir XSS (FG-IR-17-242)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Firewalls and running in the context l.

Upgrading eliminates this vulnerability. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (104886).

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
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CVSSv3info

VulDB Meta Base Score: 4.4
VulDB Meta Temp Score: 4.4

VulDB Base Score: 3.5
VulDB Temp Score: 3.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.4
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
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NVD Base Score: 🔍

Exploitinginfo

Class: Cross site scripting
CWE: CWE-79 / CWE-74 / CWE-707
ATT&CK: T1059.007

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 104886
Nessus Name: Fortinet FortiOS <= 5.4 / 5.6.x < 5.6.8 / 6.0.x < 6.0.5 SSL VPN Web Portal login redir XSS (FG-IR-17-242)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

09/07/2017 🔍
11/23/2017 +77 days 🔍
11/23/2017 +0 days 🔍
11/27/2017 +4 days 🔍
11/29/2017 +2 days 🔍
11/29/2017 +0 days 🔍
11/30/2017 +1 days 🔍
11/30/2017 +0 days 🔍
01/25/2021 +1152 days 🔍

Sourcesinfo

Vendor: fortinet.com

Advisory: FG-IR-17-242
Researcher: Stefan Viehböck
Organization: SEC Consult
Status: Confirmed
Confirmation: 🔍
Coordinated: 🔍

CVE: CVE-2017-14186 (🔍)
SecurityTracker: 1039891
SecurityFocus: 101955 - Fortinet FortiOS CVE-2017-14186 URI Redirection and Cross Site Scripting Vulnerabilities

Entryinfo

Created: 11/30/2017 08:09
Updated: 01/25/2021 10:19
Changes: 11/30/2017 08:09 (76), 12/11/2019 09:02 (5), 01/25/2021 10:19 (2)
Complete: 🔍

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