etcd up to 3.2.25/3.3.10 Role-Based Access Control TLS Certificate improper authentication

CVSS Meta Temp Score
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CTI Interest Score
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7.5$0-$5k0.00

Summaryinfo

A vulnerability was found in etcd up to 3.2.25/3.3.10 and classified as critical. This vulnerability affects unknown code of the component Role-Based Access Control. Executing a manipulation as part of TLS Certificate can lead to improper authentication. The identification of this vulnerability is CVE-2018-16886. The attack may be launched remotely. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability has been found in etcd up to 3.2.25/3.3.10 and classified as critical. This vulnerability affects an unknown code of the component Role-Based Access Control. The manipulation as part of a TLS Certificate leads to a improper authentication vulnerability. The CWE definition for the vulnerability is CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

etcd versions 3.2.x before 3.2.26 and 3.3.x before 3.3.11 are vulnerable to an improper authentication issue when role-based access control (RBAC) is used and client-cert-auth is enabled. If an etcd client server TLS certificate contains a Common Name (CN) which matches a valid RBAC username, a remote attacker may authenticate as that user with any valid (trusted) client certificate in a REST API request to the gRPC-gateway.

The bug was discovered 01/14/2019. The weakness was shared 01/14/2019 by Matt as not defined bug report (Bugzilla). The advisory is available at bugzilla.redhat.com. This vulnerability was named CVE-2018-16886 since 09/11/2018. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. The technical details are unknown and an exploit is not available.

The vulnerability scanner Nessus provides a plugin with the ID 121531 (RHEL 7 : etcd (RHSA-2019:0237) (deprecated)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Red Hat Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 237277 (Red Hat Update for etcd (RHSA-2019:1352)).

Upgrading to version 3.2.26 or 3.3.11 eliminates this vulnerability. A possible mitigation has been published 3 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (121531) and SecurityFocus (BID 106540†). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.4
VulDB Meta Temp Score: 7.3

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 8.1
NVD Vector: 🔍

CNA Base Score: 6.8
CNA Vector (Red Hat, Inc.): 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Improper authentication
CWE: CWE-287
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: 121531
Nessus Name: RHEL 7 : etcd (RHSA-2019:0237) (deprecated)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: etcd 3.2.26/3.3.11

Timelineinfo

09/11/2018 🔍
01/11/2019 +122 days 🔍
01/14/2019 +3 days 🔍
01/14/2019 +0 days 🔍
01/14/2019 +0 days 🔍
01/15/2019 +1 days 🔍
01/31/2019 +16 days 🔍
02/01/2019 +1 days 🔍
06/27/2023 +1607 days 🔍

Sourcesinfo

Advisory: RHSA-2019:0237
Researcher: Matt
Status: Not defined
Confirmation: 🔍

CVE: CVE-2018-16886 (🔍)
GCVE (CVE): GCVE-0-2018-16886
GCVE (VulDB): GCVE-100-129154
SecurityFocus: 106540 - etcd CVE-2018-16886 Authentication Bypass Vulnerability

Entryinfo

Created: 01/15/2019 09:57
Updated: 06/27/2023 08:27
Changes: 01/15/2019 09:57 (75), 04/29/2020 12:52 (6), 06/27/2023 08:24 (4), 06/27/2023 08:27 (11)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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