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CVE-2021-20230

Status Candidate

Overview

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.

Related Files

Ubuntu Security Notice USN-6901-1
Posted Jul 18, 2024
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6901-1 - It was discovered that stunnel did not properly validate client certificates when configured to use both the redirect and verifyChain options. A remote attacker could potentially use this issue to obtain sensitive information by accessing the tunneled service.

tags | advisory, remote
systems | linux, ubuntu
advisories | CVE-2021-20230
SHA-256 | 933f9a0affdeefea6ab6aa2495ffa6ba1333eebfac57eaf7677ea9c67f425cb8
Gentoo Linux Security Advisory 202105-02
Posted May 26, 2021
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 202105-2 - Stunnel was not properly verifying TLS certificates, possibly allowing an integrity/confidentiality compromise. Versions less than 5.58 are affected.

tags | advisory
systems | linux, gentoo
advisories | CVE-2021-20230
SHA-256 | 1635873d166deabc1f6711fb12e6badb08c02e74b24433544d2ea9041c75f950
Red Hat Security Advisory 2021-0719-01
Posted Mar 4, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-0719-01 - Red Hat Advanced Cluster Management for Kubernetes 2.0.8 images. Red Hat Advanced Cluster Management for Kubernetes provides the capabilities to address common challenges that administrators and site reliability engineers face as they work across a range of public and private cloud environments. Clusters and applications are all visible and managed from a single console—with security policy built in. This advisory contains the container images for Red Hat Advanced Cluster Management for Kubernetes, which resolve some security issues and bugs.

tags | advisory
systems | linux, redhat
advisories | CVE-2020-10543, CVE-2020-10878, CVE-2020-12723, CVE-2020-14351, CVE-2020-15436, CVE-2020-25705, CVE-2020-29661, CVE-2020-35513, CVE-2021-20230, CVE-2021-3121
SHA-256 | 2f14cab81d5c42464f47e9dcf7d3143a48bb175a76c4d60fed61e7817dcce904
Red Hat Security Advisory 2021-0619-01
Posted Feb 22, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-0619-01 - Stunnel is a wrapper for network connections. It can be used to tunnel an unencrypted network connection over an encrypted connection or to provide an encrypted means of connecting to services that do not natively support encryption.

tags | advisory
systems | linux, redhat
advisories | CVE-2021-20230
SHA-256 | 0804580a5942e5cf829c14d22f6f8dec6f31b02d70cce8363d767ffcc9f6a9ff
Red Hat Security Advisory 2021-0618-01
Posted Feb 22, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-0618-01 - Stunnel is a wrapper for network connections. It can be used to tunnel an unencrypted network connection over an encrypted connection or to provide an encrypted means of connecting to services that do not natively support encryption.

tags | advisory
systems | linux, redhat
advisories | CVE-2021-20230
SHA-256 | a5a187df0b460b9f48688c119706d2fe787ad16540715bb06db194e3716d0c03
Red Hat Security Advisory 2021-0620-01
Posted Feb 22, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-0620-01 - Stunnel is a wrapper for network connections. It can be used to tunnel an unencrypted network connection over an encrypted connection or to provide an encrypted means of connecting to services that do not natively support encryption.

tags | advisory
systems | linux, redhat
advisories | CVE-2021-20230
SHA-256 | 760e622f206e5b48dce30465bc9e5a827a851e7563d8b477a297b682a9934d9a
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