CVE-2020-15136
published 2020-08-06CVE-2020-15136: 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…
PriorityP339medium6.5CVSS 3.1
AVNACHPRNUINSUCHILAN
EPSS
1.64%
73.7th percentile
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.
Affected
15 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | etcd | < etcd 3.3.25+dfsg-5 (bookworm) | etcd 3.3.25+dfsg-5 (bookworm) |
| etcd-io | etcd | < 3.3.23 | 3.3.23 |
| etcd-io | etcd | — | — |
| etcd | etcd | >= 0 < 3.3.25+dfsg-5 | 3.3.25+dfsg-5 |
| etcd | etcd | >= 0 < 3.3.25+dfsg-5 | 3.3.25+dfsg-5 |
| etcd | etcd | >= 0 < 3.3.25+dfsg-5 | 3.3.25+dfsg-5 |
| etcd | etcd | >= 0 < 3.3.25+dfsg-5 | 3.3.25+dfsg-5 |
| fedoraproject | fedora | — | — |
| go.etcd.io | etcd | >= 0 < 3.3.23 | 3.3.23 |
| go.etcd.io | etcd | >= 3.4.0-rc.0 < 3.4.10 | 3.4.10 |
| msrc | cbl2_etcd_3.5.0-3_on_cbl_mariner_2.0 | — | — |
| msrc | cbl_mariner_2.0_arm | — | — |
| msrc | cbl_mariner_2.0_x64 | — | — |
| redhat | etcd | >= 3.3.0 < 3.3.23 | 3.3.23 |
| redhat | etcd | >= 3.4.0 < 3.4.10 | 3.4.10 |
CVSS provenance
nvdv3.16.5MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
nvdv2.05.8MEDIUMAV:N/AC:M/Au:N/C:P/I:P/A:N
osv6.5MEDIUM
vendor_debian6.5MEDIUM
vendor_msrc6.5MEDIUM
vendor_redhat6.5MEDIUM
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Microsoft
Improper authentication in etcd
vendor_msrc·2020-08-11·CVSS 6.5
CVE-2020-15136 [MEDIUM] CWE-306 Improper authentication in etcd
Improper authentication in etcd
FAQ: Is Azure Linux the only Microsoft product that includes this open-source library and is therefore potentially affected by this vulnerability?
One of the main benefits to our customers who choose to use the Azure Linux distro is the commitment to keep it up to date with the most recent and most secure versions of the open source libraries with which the distro is composed. Microsoft is committed to transparency in this work which is why we began publishing CSAF/VEX in October 2025. See this blog post for more information. If impact to additional products is identified, we will update the CVE to reflect this.
Mariner: Mariner
GitHub_M: GitHub_M
Customer Action Required: Yes
Remediation: CBL-Mariner Releases
Reference: https://learn.microsoft.com/en-
Red Hat
etcd: no authentication is performed against endpoints provided in the --endpoints flag
vendor_redhat·2020-08-05·CVSS 6.5
CVE-2020-15136 [MEDIUM] CWE-287 etcd: no authentication is performed against endpoints provided in the --endpoints flag
etcd: no authentication is performed against endpoints provided in the --endpoints flag
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.
A flaw was found in etcd. The 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
Debian
CVE-2020-15136: etcd - In ectd before versions 3.4.10 and 3.3.23, gateway TLS authentication is only ap...
vendor_debian·2020·CVSS 6.5
CVE-2020-15136 [MEDIUM] CVE-2020-15136: etcd - In ectd before versions 3.4.10 and 3.3.23, gateway TLS authentication is only ap...
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.
Scope: local
bookworm: resolved (fixed in 3.3.25+dfsg-5)
bullseye: resolved (fixed in 3.3.25+dfsg-5)
forky: resolved (fixed in 3.3.25+dfsg-5)
sid: resolved (fixed in 3.3.25+dfsg-5)
trixie: resolved (fixed in 3.3.25+dfsg-5)
GHSA
Etcd Gateway TLS authentication only applies to endpoints detected in DNS SRV records
ghsa·2024-01-31
CVE-2020-15136 [MEDIUM] CWE-287 Etcd Gateway TLS authentication only applies to endpoints detected in DNS SRV records
Etcd Gateway TLS authentication only applies to endpoints detected in DNS SRV records
### 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 for
OSV
Etcd Gateway TLS authentication only applies to endpoints detected in DNS SRV records
osv·2024-01-31
CVE-2020-15136 [MEDIUM] Etcd Gateway TLS authentication only applies to endpoints detected in DNS SRV records
Etcd Gateway TLS authentication only applies to endpoints detected in DNS SRV records
### 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 for
OSV
CVE-2020-15136: In ectd before versions 3
osv·2020-08-06·CVSS 6.5
CVE-2020-15136 [MEDIUM] CVE-2020-15136: In ectd before versions 3
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.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2020-15136 etcd: no authentication is performed against endpoints provided in the --endpoints flag [fedora-all]
bugzilla·2020-08-14·CVSS 6.5
CVE-2020-15136 [MEDIUM] CVE-2020-15136 etcd: no authentication is performed against endpoints provided in the --endpoints flag [fedora-all]
CVE-2020-15136 etcd: no authentication is performed against endpoints provided in the --endpoints flag [fedora-all]
This is an automatically created tracking bug! It was created to ensure
that one or more security vulnerabilities are fixed in affected versions
of fedora-all.
For comments that are specific to the vulnerability please use bugs filed
against the "Security Response" product referenced in the "Blocks" field.
For more information see:
http://fedoraproject.org/wiki/Security/TrackingBugs
When submitting as an update, use the fedpkg template provided in the next
comment(s). This will include the bug IDs of this tracking bug as well as
the relevant top-level CVE bugs.
Please also mention the CVE IDs being fixed in the RPM changelog and the
fedpkg commit message.
NOTE: this iss
Bugzilla
CVE-2020-15136 etcd: no authentication is performed against endpoints provided in the --endpoints flag
bugzilla·2020-08-14·CVSS 6.5
CVE-2020-15136 [MEDIUM] CVE-2020-15136 etcd: no authentication is performed against endpoints provided in the --endpoints flag
CVE-2020-15136 etcd: no authentication is performed against endpoints provided in the --endpoints flag
In etcd 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.
References:
https://github.com/etcd-io/etcd/blob/master/Documentation/op-guide/gateway.md
https://github.com/etcd-io/etcd/security/advisories/GHSA-wr2v-9rpq-c35q
Discussion:
Created etcd t
https://github.com/etcd-io/etcd/blob/master/Documentation/op-guide/gateway.mdhttps://github.com/etcd-io/etcd/security/advisories/GHSA-wr2v-9rpq-c35qhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L6B6R43Y7M3DCHWK3L3UVGE2K6WWECMP/https://github.com/etcd-io/etcd/blob/master/Documentation/op-guide/gateway.mdhttps://github.com/etcd-io/etcd/security/advisories/GHSA-wr2v-9rpq-c35qhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L6B6R43Y7M3DCHWK3L3UVGE2K6WWECMP/
2020-08-06
Published