MatrixSSL up to 3.8.6 Modular Expontiation pstm_exptmod information disclosure

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 (≈)
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CTI Interest Score
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4.5$0-$5k0.00

Summaryinfo

A vulnerability was found in MatrixSSL up to 3.8.6 and classified as problematic. Affected by this issue is the function pstm_exptmod of the component Modular Expontiation Handler. The manipulation results in information disclosure. This vulnerability is identified as CVE-2016-6887. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in MatrixSSL up to 3.8.6. It has been classified as problematic. Affected is the function pstm_exptmod of the component Modular Expontiation Handler. The manipulation with an unknown input leads to a information disclosure vulnerability. CWE is classifying the issue as CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. This is going to have an impact on confidentiality. CVE summarizes:

The pstm_exptmod function in MatrixSSL 3.8.6 and earlier does not properly perform modular expontiation, which might allow remote attackers to predict the secret key via a CRT attack.

The bug was discovered 07/19/2016. The weakness was released 01/13/2017 (Website). The advisory is shared for download at matrixssl.org. This vulnerability is traded as CVE-2016-6887 since 08/19/2016. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1592.

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.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Entries connected to this vulnerability are available at VDB-95314 and VDB-95315. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.5
VulDB Meta Temp Score: 4.5

VulDB Base Score: 3.1
VulDB Temp Score: 3.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.9
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Information disclosure
CWE: CWE-200 / CWE-284 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

07/19/2016 🔍
08/19/2016 +31 days 🔍
01/13/2017 +147 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-2016-6887 (🔍)
GCVE (CVE): GCVE-0-2016-6887
GCVE (VulDB): GCVE-100-95316
OSVDB: - CVE-2016-6887 - MatrixSSL - Chinese Remainder Theorem Issue

See also: 🔍

Entryinfo

Created: 01/15/2017 10:37
Updated: 07/21/2020 16:33
Changes: 01/15/2017 10:37 (57), 07/21/2020 16:33 (4)
Complete: 🔍
Cache ID: 216:B29:103

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