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.
5.6	$0-$5k	0.00

Summaryinfo

A vulnerability has been found in MatrixSSL up to 3.8.3 and classified as problematic. Affected by this vulnerability is the function pstm_reverse. The manipulation leads to key management. This vulnerability is referenced as CVE-2016-6886. Remote exploitation of the attack is possible. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in MatrixSSL up to 3.8.3 and classified as problematic. This issue affects the function pstm_reverse. The manipulation with an unknown input leads to a key management vulnerability. Using CWE to declare the problem leads to CWE-320. Impacted is availability. The summary by CVE is:

The pstm_reverse function in MatrixSSL before 3.8.4 allows remote attackers to cause a denial of service (invalid memory read and crash) via a (1) zero value or (2) the key's modulus for the secret key during RSA key exchange.

The bug was discovered 07/19/2016. The weakness was published 01/13/2017 (Website). It is possible to read the advisory at matrixssl.org. The identification of this vulnerability is CVE-2016-6886 since 08/19/2016. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. 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 T1600.001 according to MITRE ATT&CK.

The vulnerability was handled as a non-public zero-day exploit for at least 178 days. During that time the estimated underground price was around $0-$5k.

Upgrading to version 3.8.4 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at SecurityFocus (BID 92604†). Similar entries are available at VDB-95314 and VDB-95316. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Name

• MatrixSSL

Version

• 3.8.0
• 3.8.1
• 3.8.2
• 3.8.3

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.9
VulDB Meta Temp Score: 5.8

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

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

NVD Base Score: 🔍

Exploitinginfo

Class: Key management
CWE: CWE-320
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: MatrixSSL 3.8.4

Timelineinfo

07/19/2016 🔍
08/19/2016 +31 days 🔍
08/23/2016 +4 days 🔍
01/13/2017 +143 days 🔍
01/13/2017 +0 days 🔍
01/15/2017 +2 days 🔍
07/21/2020 +1283 days 🔍

Sourcesinfo

Advisory: matrixssl.org
Status: Not defined
Confirmation: 🔍

CVE: CVE-2016-6886 (🔍)
GCVE (CVE): GCVE-0-2016-6886
GCVE (VulDB): GCVE-100-95315
SecurityFocus: 92604 - MatrixSSL CVE-2016-6886 Denial of Service Vulnerability
OSVDB: - CVE-2016-6886 - MatrixSSL - Denial of Service Issue

See also: 🔍

Entryinfo

Created: 01/15/2017 10:37
Updated: 07/21/2020 16:29
Changes: 01/15/2017 10:37 (60), 07/21/2020 16:29 (6)
Complete: 🔍
Cache ID: 216:12E:103

Discussion

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