Fortinet FortiOS up to 4.3.12 SSL-VPN input validation

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.
6.2$0-$5k0.00

Summaryinfo

A vulnerability was found in Fortinet FortiOS up to 4.3.12. It has been rated as critical. This impacts an unknown function of the component SSL-VPN. Performing a manipulation results in input validation. This vulnerability is known as CVE-2015-5965. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Fortinet FortiOS up to 4.3.12 (Firewall Software). It has been classified as critical. This affects an unknown function of the component SSL-VPN. The manipulation with an unknown input leads to a input validation vulnerability. CWE is classifying the issue as CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. This is going to have an impact on confidentiality, and integrity. The summary by CVE is:

The SSL-VPN feature in Fortinet FortiOS before 4.3.13 only checks the first byte of the TLS MAC in finished messages, which makes it easier for remote attackers to spoof encrypted content via a crafted MAC field.

The weakness was published 08/11/2015 by Yngve N. Pettersen (Website). The advisory is shared at vivaldi.net. This vulnerability is uniquely identified as CVE-2015-5965 since 08/11/2015. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 85806 (Fortinet FortiOS < 4.3.13 SSL-VPN TLS MAC Spoofing), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Firewalls.

Upgrading to version 4.3.13 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (85806), SecurityFocus (BID 76065†) and Vulnerability Center (SBV-52913†). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.2

VulDB Base Score: 6.5
VulDB Temp Score: 6.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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

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

NVD Base Score: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 85806
Nessus Name: Fortinet FortiOS < 4.3.13 SSL-VPN TLS MAC Spoofing
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍

OpenVAS ID: 18627
OpenVAS Name: Gentoo Linux Local Check: https://security.gentoo.org/glsa/201508-01
OpenVAS File: 🔍
OpenVAS Family: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: FortiOS 4.3.13

Timelineinfo

07/15/2015 🔍
07/15/2015 +0 days 🔍
08/11/2015 +27 days 🔍
08/11/2015 +0 days 🔍
08/11/2015 +0 days 🔍
08/12/2015 +1 days 🔍
09/22/2015 +41 days 🔍
06/07/2022 +2450 days 🔍

Sourcesinfo

Vendor: fortinet.com

Advisory: vivaldi.net
Researcher: Yngve N. Pettersen
Status: Not defined
Confirmation: 🔍

CVE: CVE-2015-5965 (🔍)
GCVE (CVE): GCVE-0-2015-5965
GCVE (VulDB): GCVE-100-76965
SecurityFocus: 76065 - Fortinet FortiOS SSL-VPN Man in The Middle Security Bypass Vulnerability
SecurityTracker: 1033256
Vulnerability Center: 52913 - Fortinet FortiOS <4.3.13 Remote Spoofing Vulnerability via Crafted MAC Field in SSL-VPN Feature, Medium

Entryinfo

Created: 08/12/2015 10:23
Updated: 06/07/2022 14:54
Changes: 08/12/2015 10:23 (54), 01/03/2018 09:50 (15), 06/07/2022 14:53 (3), 06/07/2022 14:54 (1)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Do you want to use VulDB in your project?

Use the official API to access entries easily!