CVE-2020-15136: Improper authentication in etcd
First published: Wed Aug 05 2020(Updated: )
### 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)
Credit: security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/etcd | <0:3.3.23-1.el8 | 0:3.3.23-1.el8 |
| Redhat Etcd | >=3.3.0<3.3.23 | |
| Redhat Etcd | >=3.4.0<3.4.10 | |
| Fedoraproject Fedora | =32 | |
| redhat/etcd | <3.4.10 | 3.4.10 |
| redhat/etcd | <3.3.23 | 3.3.23 |
| go/go.etcd.io/etcd | <3.3.23 | 3.3.23 |
| go/go.etcd.io/etcd | >=3.4.0-rc.0<=3.4.9 | 3.4.10 |
| >=3.3.0<3.3.23 | ||
| >=3.4.0<3.4.10 | ||
| =32 |
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Reference Links
- https://www.cve.org/CVERecord?id=CVE-2020-15136 https://nvd.nist.gov/vuln/detail/CVE-2020-15136 https://github.com/etcd-io/etcd/security/advisories/GHSA-wr2v-9rpq-c35q
- https://bugzilla.redhat.com/show_bug.cgi?id=1868880
- https://access.redhat.com/errata/RHSA-2021:2438
- https://access.redhat.com/errata/RHSA-2021:0916
- https://access.redhat.com/security/cve/cve-2020-15136
- 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
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/L6B6R43Y7M3DCHWK3L3UVGE2K6WWECMP/
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1868881
- https://github.com/etcd-io/etcd/commit/b86bb615ffcfc51494566e3cd8b69f8a7b408721
- https://nvd.nist.gov/vuln/detail/CVE-2020-15136
- https://github.com/advisories/GHSA-wr2v-9rpq-c35q (Advisory)
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L6B6R43Y7M3DCHWK3L3UVGE2K6WWECMP/
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