Security update for stunnel SUSE Patch security@suse.de SUSE Security Team SUSE-SU-2021:0772-1 Final 1 1 2021-03-12T10:56:28Z current 2021-03-12T10:56:28Z 2021-03-12T10:56:28Z cve-database/bin/generate-cvrf.pl 2017-02-24T01:00:00Z Security update for stunnel This update for stunnel fixes the following issues: - Security fix: [bsc#1177580, bsc#1182529, CVE-2021-20230] * 'redirect' option does not properly handle 'verifyChain = yes' The CVRF data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0). SUSE-2021-772,SUSE-SLE-Module-Server-Applications-15-SP2-2021-772 Copyright SUSE LLC under the Creative Commons License 4.0 with Attribution (CC-BY-4.0) https://www.suse.com/support/update/announcement/2021/suse-su-20210772-1/ Link for SUSE-SU-2021:0772-1 https://lists.suse.com/pipermail/sle-security-updates/2021-March/008483.html E-Mail link for SUSE-SU-2021:0772-1 https://www.suse.com/support/security/rating/ SUSE Security Ratings https://bugzilla.suse.com/1177580 SUSE Bug 1177580 https://bugzilla.suse.com/1182529 SUSE Bug 1182529 https://www.suse.com/security/cve/CVE-2021-20230/ SUSE CVE CVE-2021-20230 page SUSE Linux Enterprise Module for Server Applications 15 SP2 stunnel-5.57-3.11.1 stunnel-doc-5.57-3.11.1 stunnel-5.57-3.11.1 as a component of SUSE Linux Enterprise Module for Server Applications 15 SP2 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. CVE-2021-20230 SUSE Linux Enterprise Module for Server Applications 15 SP2:stunnel-5.57-3.11.1 important To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/support/update/announcement/2021/suse-su-20210772-1/ https://www.suse.com/security/cve/CVE-2021-20230.html CVE-2021-20230 https://bugzilla.suse.com/1177580 SUSE Bug 1177580 https://bugzilla.suse.com/1182529 SUSE Bug 1182529