Bug 1925226 (CVE-2021-20230)
Summary: | CVE-2021-20230 stunnel: client certificate not correctly verified when redirect and verifyChain options are used | ||
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Product: | [Other] Security Response | Reporter: | Riccardo Schirone <rschiron> |
Component: | vulnerability | Assignee: | Red Hat Product Security <security-response-team> |
Status: | CLOSED ERRATA | QA Contact: | |
Severity: | high | Docs Contact: | |
Priority: | high | ||
Version: | unspecified | CC: | asosedki, crypto-team, ngompa13, rhel-crypto-maint, sahana, security-response-team, szidek, tm |
Target Milestone: | --- | Keywords: | Security |
Target Release: | --- | ||
Hardware: | All | ||
OS: | Linux | ||
Whiteboard: | |||
Fixed In Version: | stunnel 5.57 | Doc Type: | If docs needed, set a value |
Doc Text: |
A flaw was found in stunnel, 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.
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Story Points: | --- |
Clone Of: | Environment: | ||
Last Closed: | 2021-02-22 13:02:02 UTC | Type: | --- |
Regression: | --- | Mount Type: | --- |
Documentation: | --- | CRM: | |
Verified Versions: | Category: | --- | |
oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
Cloudforms Team: | --- | Target Upstream Version: | |
Embargoed: | |||
Bug Depends On: | 1925229, 1925230, 1926894, 1926895, 1926896, 1926897 | ||
Bug Blocks: | 1919806, 1926224 |
Description
Riccardo Schirone
2021-02-04 16:15:34 UTC
"redirect" option was added in stunnel upstream version 5.00, according to https://www.stunnel.org/NEWS.html . Statement: This issue did not affect the versions of stunnel as shipped with Red Hat Enterprise Linux 5, 6, and 7 as they did not include support for the "redirect" option. This issue has been addressed in the following products: Red Hat Enterprise Linux 8.1 Extended Update Support Via RHSA-2021:0620 https://access.redhat.com/errata/RHSA-2021:0620 This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2021:0618 https://access.redhat.com/errata/RHSA-2021:0618 This issue has been addressed in the following products: Red Hat Enterprise Linux 8.2 Extended Update Support Via RHSA-2021:0619 https://access.redhat.com/errata/RHSA-2021:0619 This bug is now closed. Further updates for individual products will be reflected on the CVE page(s): https://access.redhat.com/security/cve/cve-2021-20230 |