Auth bypass in Etcd-Io Etcd
CVE-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 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.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N.
EPSS exploit prediction
EPSS: 0.016 (75.4th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 75th percentile — 75.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · change: 0.000
Affected products
- Etcd-Io Etcd — versions >= 3.4.0, < 3.4.10, < 3.3.23
- Fedoraproject Fedora — versions 32
- Red Hat Etcd
Weakness classification (CWE)
References
- github.com/etcd-io/etcd/security/advisories/GHSA-wr2v-9rpq-c35q (Third Party Advisory)
- github.com/etcd-io/etcd/blob/master/Documentation/op-guide/gateway.md (Broken Link)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
Frequently asked questions
- What is CVE-2020-15136?
- CVE-2020-15136 is a medium-severity vulnerability in Etcd-Io Etcd, classified under Improper Authentication. CVSS score: 6.5/10. Published 2020-08-06.
- How severe is CVE-2020-15136?
- Medium severity. CVSS v3 base score is 6.5 out of 10.