CVE-2021-20230
Summary
| CVE | CVE-2021-20230 |
|---|---|
| State | PUBLIC |
| Assigner | [email protected] |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2021-02-23 17:15:00 UTC |
| Updated | 2022-06-01 18:05:00 UTC |
| 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. |
Risk And Classification
Problem Types: CWE-295
NVD Known Affected Configurations (CPE 2.3)
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| stunnel: Improper certificate validation (GLSA 202105-02) — Gentoo security | GENTOO | security.gentoo.org | |
| 1925226 – (CVE-2021-20230) CVE-2021-20230 stunnel: client certificate not correctly verified when redirect and verifyChain options are used | MISC | bugzilla.redhat.com | Issue Tracking, Third Party Advisory |
| stunnel-5.57 · mtrojnar/stunnel@ebad9dd · GitHub | MISC | github.com | Patch, Third Party Advisory |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
Legacy QID Mappings
- 174790 SUSE Enterprise Linux Security update for stunnel (SUSE-SU-2021:0772-1)
- 174973 SUSE Enterprise Linux Security Update for stunnel (SUSE-SU-2021:1465-1)
- 179817 Debian Security Update for stunnel4 (CVE-2021-20230)
- 296059 Oracle Solaris 11.4 Support Repository Update (SRU) 36.0.1.101.2 Missing (CPUJUL2021)
- 376189 Stunnel Improper Certificate Validation Vulnerability
- 377138 Alibaba Cloud Linux Security Update for stunnel (ALINUX3-SA-2021:0011)
- 670335 EulerOS Security Update for stunnel (EulerOS-SA-2021-1889)
- 710113 Gentoo Linux stunnel Improper certificate validation vulnerability (GLSA 202105-02)
- 750322 OpenSUSE Security Update for stunnel (openSUSE-SU-2021:0409-1)
- 901597 Common Base Linux Mariner (CBL-Mariner) Security Update for stunnel (7375)
- 907275 Common Base Linux Mariner (CBL-Mariner) Security Update for stunnel (7375-1)
- 940001 AlmaLinux Security Update for stunnel (ALSA-2021:0618)
- 960686 Rocky Linux Security Update for stunnel (RLSA-2021:0618)