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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

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
MD5 | cd4f607dc983429a04bd827ba73a4b45
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
MD5 | 710e5973820f10de3dd34c4ac2b87276
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
MD5 | 441a247ebe53b9c200314a189b47d535
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
MD5 | 22ddef1ff00ed8f3e57df4f7e0151467
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
MD5 | 126ba9419fcf4c9d22262fb9349a37ca
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