Upstream information

CVE-2021-20230 at MITRE

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.

SUSE information

Overall state of this security issue: Resolved

This issue is currently rated as having important severity.

CVSS v2 Scores
  National Vulnerability Database
Base Score 5
Vector AV:N/AC:L/Au:N/C:P/I:N/A:N
Access Vector Network
Access Complexity Low
Authentication None
Confidentiality Impact Partial
Integrity Impact None
Availability Impact None
CVSS v3 Scores
  National Vulnerability Database SUSE
Base Score 7.5 7.5
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Access Vector Network Network
Access Complexity Low Low
Privileges Required None None
User Interaction None None
Scope Unchanged Unchanged
Confidentiality Impact High High
Integrity Impact None None
Availability Impact None None
CVSSv3 Version 3.1 3.1
SUSE Bugzilla entries: 1177580 [RESOLVED / FIXED], 1182529 [CONFIRMED]

SUSE Security Advisories:

List of released packages

Product(s) Fixed package version(s) References
SUSE CaaS Platform 4.0
  • stunnel >= 5.44-3.8.1
Patchnames:
SUSE-SUSE-CAASP-4.0-2021-1465
SUSE Enterprise Storage 6
  • stunnel >= 5.44-3.8.1
Patchnames:
SUSE-Storage-6-2021-1465
SUSE Linux Enterprise High Performance Computing 15 SP1-ESPOS
  • stunnel >= 5.44-3.8.1
Patchnames:
SUSE-SLE-Product-HPC-15-SP1-ESPOS-2021-1465
SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS
  • stunnel >= 5.44-3.8.1
Patchnames:
SUSE-SLE-Product-HPC-15-SP1-LTSS-2021-1465
SUSE Linux Enterprise High Performance Computing 15-ESPOS
SUSE Linux Enterprise High Performance Computing 15-LTSS
  • stunnel >= 5.44-3.8.1
Patchnames:
SUSE-SLE-Product-HPC-15-2021-1465
SUSE Linux Enterprise Module for Open Buildservice Development Tools 15 SP2
  • stunnel-doc >= 5.57-3.11.1
Patchnames:
SUSE-SLE-Module-Development-Tools-OBS-15-SP2-2021-772
SUSE Linux Enterprise Module for Server Applications 15 SP2
  • stunnel >= 5.57-3.11.1
Patchnames:
SUSE-SLE-Module-Server-Applications-15-SP2-2021-772
SUSE Linux Enterprise Server 15 SP1-BCL
  • stunnel >= 5.44-3.8.1
Patchnames:
SUSE-SLE-Product-SLES-15-SP1-BCL-2021-1465
SUSE Linux Enterprise Server 15 SP1-LTSS
  • stunnel >= 5.44-3.8.1
Patchnames:
SUSE-SLE-Product-SLES-15-SP1-LTSS-2021-1465
SUSE Linux Enterprise Server 15-LTSS
  • stunnel >= 5.44-3.8.1
Patchnames:
SUSE-SLE-Product-SLES-15-2021-1465
SUSE Linux Enterprise Server for SAP Applications 15 SP1
  • stunnel >= 5.44-3.8.1
Patchnames:
SUSE-SLE-Product-SLES_SAP-15-SP1-2021-1465
SUSE Linux Enterprise Server for SAP Applications 15
  • stunnel >= 5.44-3.8.1
Patchnames:
SUSE-SLE-Product-SLES_SAP-15-2021-1465
SUSE Manager Proxy 4.0
  • stunnel >= 5.44-3.8.1
Patchnames:
SUSE-SLE-Product-SUSE-Manager-Proxy-4.0-2021-1465
SUSE Manager Retail Branch Server 4.0
  • stunnel >= 5.44-3.8.1
Patchnames:
SUSE-SLE-Product-SUSE-Manager-Retail-Branch-Server-4.0-2021-1465
SUSE Manager Server 4.0
  • stunnel >= 5.44-3.8.1
Patchnames:
SUSE-SLE-Product-SUSE-Manager-Server-4.0-2021-1465
openSUSE Leap 15.2
  • stunnel >= 5.57-lp152.2.6.1
  • stunnel-debuginfo >= 5.57-lp152.2.6.1
  • stunnel-debugsource >= 5.57-lp152.2.6.1
  • stunnel-doc >= 5.57-lp152.2.6.1
Patchnames:
openSUSE-2021-409


Status of this issue by product and package

Please note that this evaluation state might be work in progress, incomplete or outdated. Also information for service packs in the LTSS phase is only included for issues meeting the LTSS criteria. If in doubt, feel free to contact us for clarification.

Product(s) Source package State
HPE Helion OpenStack 8 stunnel Not affected
SUSE CaaS Platform 4.0 stunnel In progress
SUSE Enterprise Storage 5 stunnel Unsupported
SUSE Enterprise Storage 6 stunnel In progress
SUSE Linux Enterprise High Performance Computing 12 SP5 stunnel Not affected
SUSE Linux Enterprise High Performance Computing 15 LTSS stunnel In progress
SUSE Linux Enterprise High Performance Computing 15 SP1 LTSS stunnel In progress
SUSE Linux Enterprise Module for Server Applications 15 SP1 stunnel Unsupported
SUSE Linux Enterprise Module for Server Applications 15 SP2 stunnel Released
SUSE Linux Enterprise Point of Service 11 SP3 stunnel Not affected
SUSE Linux Enterprise Point of Service Image Server 12 stunnel Unsupported
SUSE Linux Enterprise Server 11 SP4 LTSS stunnel Not affected
SUSE Linux Enterprise Server 12 SP2 BCL stunnel Not affected
SUSE Linux Enterprise Server 12 SP2 ESPOS stunnel Unsupported
SUSE Linux Enterprise Server 12 SP2 LTSS stunnel Affected
SUSE Linux Enterprise Server 12 SP3 BCL stunnel Not affected
SUSE Linux Enterprise Server 12 SP3 ESPOS stunnel Not affected
SUSE Linux Enterprise Server 12 SP3 LTSS stunnel Not affected
SUSE Linux Enterprise Server 12 SP4 ESPOS stunnel Not affected
SUSE Linux Enterprise Server 12 SP4 LTSS stunnel Not affected
SUSE Linux Enterprise Server 12 SP5 stunnel Not affected
SUSE Linux Enterprise Server 15 LTSS stunnel In progress
SUSE Linux Enterprise Server 15 SP1 Business Critical Linux stunnel In progress
SUSE Linux Enterprise Server 15 SP1 LTSS stunnel In progress
SUSE Linux Enterprise Server ESPOS 15 stunnel In progress
SUSE Linux Enterprise Server for SAP Applications 12 SP2 stunnel Unsupported
SUSE Linux Enterprise Server for SAP Applications 12 SP3 stunnel Not affected
SUSE Linux Enterprise Server for SAP Applications 12 SP4 stunnel Not affected
SUSE Linux Enterprise Server for SAP Applications 12 SP5 stunnel Not affected
SUSE Linux Enterprise Server for SAP Applications 15 stunnel In progress
SUSE Linux Enterprise Server for SAP Applications 15 SP1 stunnel In progress
SUSE Manager Proxy 4.0 stunnel In progress
SUSE Manager Retail Branch Server 4.0 stunnel In progress
SUSE Manager Server 4.0 stunnel In progress
SUSE OpenStack Cloud 7 stunnel Affected
SUSE OpenStack Cloud 8 stunnel Not affected
SUSE OpenStack Cloud 9 stunnel Not affected
SUSE OpenStack Cloud Crowbar 8 stunnel Not affected
SUSE OpenStack Cloud Crowbar 9 stunnel Not affected