CVE-2021-20230

CVE Details

Release Date:

2021-02-23

Description

A flaw was found in stunnel before 5.57, where it improperly validates client certificates when it is configured to use both redirect and verifyChain options. This flaw allows an attacker with a certificate signed by a Certificate Authority, which is not the one accepted by the stunnel server, to access the tunneled service instead of being redirected to the address specified in the redirect option. The highest threat from this vulnerability is to confidentiality.

See more information about CVE-2021-20230 from MITRE CVE dictionary and NIST NVD

CVSS v3.0 metrics

NOTE: The following CVSS v3.0 metrics and score provided are preliminary and subject to review.

Base Score:	7.5	Base Metrics:	AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Access Vector:	Network	Attack Complexity:	Low
Privileges Required:	None	User Interaction:	None
Scope:	Unchanged	Confidentiality Impact:	High
Integrity Impact:	None	Availability Impact:	None

Errata information

Platform	Errata	Release Date
Oracle Linux version 8 (stunnel)	ELSA-2021-0618	2021-02-23

This page is generated automatically and has not been checked for errors or omissions. For clarification or corrections please contact the Oracle Linux ULN team