Fortinet FortiClient up to 5.2.3 IOCTL Call Fortishield.sys 0x220024/0x220028 access control

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, which was classified as problematic, has been found in Fortinet FortiClient up to 5.2.3. Affected by this vulnerability is an unknown functionality of the file Fortishield.sys of the component IOCTL Call Handler. The manipulation of the argument 0x220024/0x220028 leads to access control. This vulnerability is documented as CVE-2015-5736. Additionally, an exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Fortinet FortiClient up to 5.2.3. It has been rated as problematic. This issue affects an unknown functionality of the file Fortishield.sys of the component IOCTL Call Handler. The manipulation of the argument 0x220024/0x220028 with an unknown input leads to a access control vulnerability. Using CWE to declare the problem leads to CWE-264. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

The Fortishield.sys driver in Fortinet FortiClient before 5.2.4 allows local users to execute arbitrary code with kernel privileges by setting the callback function in a (1) 0x220024 or (2) 0x220028 ioctl call.

The weakness was released 09/03/2015 (Website). The advisory is shared at securitytracker.com. The identification of this vulnerability is CVE-2015-5736 since 08/04/2015. An attack has to be approached locally. No form of authentication is needed for a successful exploitation. Technical details as well as a public exploit are known. MITRE ATT&CK project uses the attack technique T1068 for this issue.

A public exploit has been developed by sickness and been published 2 years after the advisory. The exploit is available at exploit-db.com. It is declared as proof-of-concept. The commercial vulnerability scanner Qualys is able to test this issue with plugin 123870 (FortiClient Antivirus Multiple Security Vulnerabilities).

Upgrading to version 5.2.4 eliminates this vulnerability.

The vulnerability is also documented in the databases at Exploit-DB (41721), SecurityFocus (BID 76542†) and Vulnerability Center (SBV-53036†). Entries connected to this vulnerability are available at VDB-77554, VDB-77560 and VDB-77562. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.9
VulDB Meta Temp Score: 5.3

VulDB Base Score: 5.9
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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

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

NVD Base Score: 🔍

Exploitinginfo

Class: Access control
CWE: CWE-264
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Author: sickness
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Qualys ID: 🔍
Qualys Name: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍
Exploit Delay Time: 🔍

Upgrade: FortiClient 5.2.4

Timelineinfo

08/04/2015 🔍
09/01/2015 +28 days 🔍
09/01/2015 +0 days 🔍
09/03/2015 +2 days 🔍
09/03/2015 +0 days 🔍
09/04/2015 +1 days 🔍
09/30/2015 +25 days 🔍
03/24/2017 +542 days 🔍
03/24/2017 +0 days 🔍
07/19/2025 +3038 days 🔍

Sourcesinfo

Vendor: fortinet.com

Advisory: 133398⛔
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2015-5736 (🔍)
GCVE (CVE): GCVE-0-2015-5736
GCVE (VulDB): GCVE-100-77561
SecurityFocus: 76542 - FortiClient CVE-2015-5736 Local Privilege Escalation Vulnerability
SecurityTracker: 1033439
Vulnerability Center: 53036 - Fortinet FortiClient before 5.2.4 Local Privilege Escalation Vulnerability in Fortishield.sys Driver, High

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

Entryinfo

Created: 09/04/2015 10:21
Updated: 07/19/2025 18:25
Changes: 09/04/2015 10:21 (55), 10/29/2018 06:04 (17), 06/14/2022 09:20 (4), 07/19/2025 18:25 (14)
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 know what is going to be exploited?

We predict KEV entries!