Fortinet FortiOS up to 6.0.4 SSL VPN Web Portal href memory corruption

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.3$0-$5k0.00

Summaryinfo

A vulnerability classified as critical has been found in Fortinet FortiOS up to 6.0.4. Affected is an unknown function of the component SSL VPN Web Portal. This manipulation of the argument href causes memory corruption. This vulnerability appears as CVE-2018-13383. The attack may be initiated remotely. In addition, an exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Fortinet FortiOS up to 6.0.4 (Firewall Software). It has been declared as critical. Affected by this vulnerability is some unknown processing of the component SSL VPN Web Portal. The manipulation of the argument href with an unknown input leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. As an impact it is known to affect availability. The summary by CVE is:

A heap buffer overflow in Fortinet FortiOS all versions below 6.0.5 in the SSL VPN web portal may cause the SSL VPN web service termination for logged in users due to a failure to properly handle javascript href data when proxying webpages.

The weakness was presented 05/29/2019 by Meh Chang and Orange Tsai as FG-IR-18-388 as confirmed advisory (Website). The advisory is shared at fortiguard.com. The public release was coordinated in cooperation with Fortinet. This vulnerability is known as CVE-2018-13383 since 07/06/2018. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details and also a exploit are known.

It is declared as attacked. The CISA Known Exploited Vulnerabilities Catalog lists this issue since 01/10/2022 with a due date of 07/10/2022:

Apply updates per vendor instructions.

Upgrading to version 6.0.5 or 6.2.0 eliminates this vulnerability. It is possible to mitigate the problem by applying the configuration setting config vpn ssl settings; unset source-interface; end. The best possible mitigation is suggested to be upgrading to the latest version. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

See VDB-135672 for similar entry. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.4
VulDB Meta Temp Score: 5.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.5
NVD Vector: 🔍

CNA Base Score: 4.3
CNA Vector (Fortinet, Inc.): 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Attacked

EPSS Score: 🔍
EPSS Percentile: 🔍

KEV Added: 🔍
KEV Due: 🔍
KEV Remediation: 🔍
KEV Ransomware: 🔍
KEV Notice: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: FortiOS 6.0.5/6.2.0
Config: config vpn ssl settings; unset source-interface; end

Timelineinfo

07/06/2018 🔍
05/15/2019 +313 days 🔍
05/29/2019 +14 days 🔍
05/30/2019 +1 days 🔍
10/23/2024 +1973 days 🔍

Sourcesinfo

Vendor: fortinet.com

Advisory: FG-IR-18-388
Researcher: Meh Chang, Orange Tsai
Status: Confirmed
Confirmation: 🔍
Coordinated: 🔍

CVE: CVE-2018-13383 (🔍)
GCVE (CVE): GCVE-0-2018-13383
GCVE (VulDB): GCVE-100-135673
SecurityFocus: 108539

scip Labs: https://www.scip.ch/en/?labs.20161013
See also: 🔍

Entryinfo

Created: 05/30/2019 07:07
Updated: 10/23/2024 17:27
Changes: 05/30/2019 07:07 (66), 06/16/2020 20:41 (1), 09/24/2023 15:46 (15), 04/22/2024 13:21 (25), 09/09/2024 22:29 (1), 10/23/2024 17:27 (1)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Want to stay up to date on a daily basis?

Enable the mail alert feature now!