VDB-101795 · CVE-2016-8496 · BID 98738

Fortinet FortiOS 5.4.2 FortiClient SSL_VPN Linux command injection

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 critical, has been found in Fortinet FortiOS 5.4.2. Affected by this issue is some unknown functionality of the component FortiClient SSL_VPN Linux. The manipulation leads to command injection. This vulnerability is referenced as CVE-2016-8496. No exploit is available.

Detailsinfo

A vulnerability was found in Fortinet FortiOS 5.4.2 (Firewall Software) and classified as critical. This issue affects an unknown functionality of the component FortiClient SSL_VPN Linux. The manipulation with an unknown input leads to a command injection vulnerability. Using CWE to declare the problem leads to CWE-77. The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

A potential execution of unauthorized code or commands vulnerability in Fortinet FortiClient SSL_VPN Linux versions available with FortiOS 5.4.2 and below allows attacker to potentially overwrite an existing file via the FortiClient log file.

The bug was discovered 04/05/2017. The weakness was published 05/27/2017 (Website). It is possible to read the advisory at fortiguard.com. The identification of this vulnerability is CVE-2016-8496 since 10/07/2016. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1202 according to MITRE ATT&CK.

The vulnerability was handled as a non-public zero-day exploit for at least 51 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 98738†). Similar entry is available at VDB-101796. Statistical analysis made it clear that VulDB provides the best quality for 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: 5.3
VulDB Meta Temp Score: 5.3

VulDB Base Score: 5.3
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: Command injection
CWE: CWE-77 / CWE-74 / CWE-707
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

10/07/2016 🔍
04/05/2017 +180 days 🔍
04/05/2017 +0 days 🔍
05/26/2017 +51 days 🔍
05/27/2017 +1 days 🔍
05/27/2017 +0 days 🔍
12/25/2020 +1308 days 🔍

Sourcesinfo

Vendor: fortinet.com

Advisory: fortiguard.com
Researcher: Grzegorz Wrobel
Status: Not defined

CVE: CVE-2016-8496 (🔍)
GCVE (CVE): GCVE-0-2016-8496
GCVE (VulDB): GCVE-100-101795
SecurityFocus: 98738 - Fortinet FortiClient SSLVPN CVE-2016-8496 Remote Code Execution Vulnerability
OSVDB: - Fortinet FortiClient SSLVPN for Linux file overwrite

See also: 🔍

Entryinfo

Created: 05/27/2017 09:46
Updated: 12/25/2020 16:55
Changes: 05/27/2017 09:46 (43), 10/03/2020 12:50 (6), 12/25/2020 16:49 (8), 12/25/2020 16:55 (1)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Interested in the pricing of exploits?

See the underground prices here!