CVE-2020-15136
mediumpriority · track · 27OT risk · elevatedEPSS 0.017 · 76 %ileEUUSEPSS · scored 2026-10-27
In ectd before versions 3.4.10 and 3.3.23, gateway TLS authentication is only applied to endpoints detected in DNS SRV records. When starting a gateway, TLS authentication will only be attempted on endpoints identified in DNS SRV records for a given domain, which occurs in the discoverEndpoints function. No authentication is performed against endpoints provided in the --endpoints flag. This has been fixed in versions 3.4.10 and 3.3.23 with improved documentation and deprecation of the functionality.
remediations
Vendor fix, mitigation, or workaround guidance, as published by each source.
A vendor fix is available.
- Fixedetcd-0:3.3.23-1.el8ost.ppc64le as a component of Red Hat OpenStack Platform 16.1redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2021:0916 - Fixedetcd-0:3.3.23-1.el8ost.src as a component of Red Hat OpenStack Platform 16.1redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2021:0916 - Fixedetcd-0:3.3.23-1.el8ost.x86_64 as a component of Red Hat OpenStack Platform 16.1redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2021:0916 - Fixedetcd-debuginfo-0:3.3.23-1.el8ost.ppc64le as a component of Red Hat OpenStack Platform 16.1redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2021:0916 - Fixedetcd-debuginfo-0:3.3.23-1.el8ost.x86_64 as a component of Red Hat OpenStack Platform 16.1redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2021:0916 - Fixedetcd-debugsource-0:3.3.23-1.el8ost.ppc64le as a component of Red Hat OpenStack Platform 16.1redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2021:0916 - Fixedetcd-debugsource-0:3.3.23-1.el8ost.x86_64 as a component of Red Hat OpenStack Platform 16.1redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2021:0916
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (14)
Products and version ranges known to be affected.
advisories (2)
Vendor and ecosystem advisories describing this.
- RHSA-2021:0916Red Hat Security Advisory: Red Hat OpenStack Platform 16.1.4 (etcd) security update2021-03-17csaf · redhat_csafUS
An update for etcd is now available for Red Hat OpenStack Platform 16.1 (Train). Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
- GHSA-wr2v-9rpq-c35qEtcd Gateway TLS authentication only applies to endpoints detected in DNS SRV records2024-01-31ghsa · osvUS
### Vulnerability type Cryptography ### Workarounds Refer to the [gateway documentation](https://github.com/etcd-io/etcd/blob/master/Documentation/op-guide/gateway.md). The vulnerability was spotted due to unclear documentation of how the gateway handles endpoints validation. ### Detail When starting a gateway, TLS authentication will only be attempted on endpoints identified in DNS SRV records for a given domain, which occurs in the discoverEndpoints function. No authentication is performed against endpoints provided in the --endpoints flag. The auditors has noted that appropriate documentation of this validation functionality plus deprecation of this misleading functionality is an acceptable path forward. ### References Find out more on this vulnerability in the [security audit report](https://github.com/etcd-io/etcd/blob/master/security/SECURITY_AUDIT.pdf) ### For more information If you have any questions or comments about this advisory: * Contact the [etcd security committee](https://github.com/etcd-io/etcd/blob/master/security/security-release-process.md#product-security-committee-psc)
also known as (3)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (14)
External citations — patches, advisories, analysis.
- https://github.com/etcd-io/etcd/blob/master/Documentation/op-guide/gateway.mdcnnvd
- https://github.com/etcd-io/etcd/security/advisories/GHSA-wr2v-9rpq-c35qcnnvd
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/L6B6R43Y7M3DCHWK3L3UVGE2K6WWECMP/cnnvd
- https://nvd.nist.gov/vuln/detail/CVE-2020-15136cnnvd
- https://packetstormsecurity.com/files/161851/Red-Hat-Security-Advisory-2021-0916-01.htmlcnnvd
- https://packetstormsecurity.com/files/163690/Red-Hat-Security-Advisory-2021-2438-01.htmlcnnvd
- https://www.auscert.org.au/bulletins/ESB-2021.0946cnnvd
- https://www.auscert.org.au/bulletins/ESB-2021.2555cnnvd
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