NSS 3.21.x Diffie Hellman Client Key Exchange Private Key key management

CVSS Meta Temp Score
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CTI Interest Score
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5.3$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, was found in NSS 3.21.x. This affects an unknown function of the component Diffie Hellman Client Key Exchange Handler. The manipulation results in key management (Private Key). This vulnerability is known as CVE-2016-8635. It is possible to launch the attack remotely. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in NSS 3.21.x. It has been classified as critical. Affected is some unknown functionality of the component Diffie Hellman Client Key Exchange Handler. The manipulation with an unknown input leads to a key management vulnerability (Private Key). CWE is classifying the issue as CWE-320. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

It was found that Diffie Hellman Client key exchange handling in NSS 3.21.x was vulnerable to small subgroup confinement attack. An attacker could use this flaw to recover private keys by confining the client DH key to small subgroup of the desired group.

The bug was discovered 11/16/2016. The weakness was published 08/01/2018 with Red Hat as not defined bug report (Bugzilla). The advisory is shared for download at bugzilla.redhat.com. This vulnerability is traded as CVE-2016-8635 since 10/12/2016. The exploitability is told to be difficult. 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 neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1600.001.

The vulnerability scanner Nessus provides a plugin with the ID 94930 (OracleVM 3.3 / 3.4 : nssnss-util (OVMSA-2016-0159)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family OracleVM Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 236193 (Red Hat Update for nss and nss-util (RHSA-2016:2779)).

Upgrading eliminates this vulnerability. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (94930) and SecurityFocus (BID 94346†). Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.4
VulDB Meta Temp Score: 5.3

VulDB Base Score: 5.0
VulDB Temp Score: 4.8
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

Name: Private Key
Class: Key management / Private Key
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: 🔍

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Nessus ID: 94930
Nessus Name: OracleVM 3.3 / 3.4 : nssnss-util (OVMSA-2016-0159)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 80017
OpenVAS Name: RedHat Update for nss and nss-util RHSA-2016:2779-01
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

10/12/2016 🔍
11/15/2016 +35 days 🔍
11/16/2016 +0 days 🔍
11/16/2016 +0 days 🔍
11/17/2016 +1 days 🔍
08/01/2018 +621 days 🔍
08/01/2018 +0 days 🔍
08/02/2018 +1 days 🔍
04/28/2023 +1729 days 🔍

Sourcesinfo

Advisory: RHSA-2016:2779
Organization: Red Hat
Status: Not defined
Confirmation: 🔍

CVE: CVE-2016-8635 (🔍)
GCVE (CVE): GCVE-0-2016-8635
GCVE (VulDB): GCVE-100-122460
SecurityFocus: 94346 - Mozilla Network Security Services CVE-2013-8635 Information Disclosure Vulnerability

Entryinfo

Created: 08/02/2018 07:24
Updated: 04/28/2023 01:36
Changes: 08/02/2018 07:24 (74), 03/12/2020 10:19 (5), 04/28/2023 01:36 (4)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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