What’s Vulnerable › Vulnerabilities

CVE-2020-15113: Improper Preservation of Permissions in etcd

• Severity: high (CVSS 7.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-08-05 · updated 2026-06-17
• Weakness: CWE-281

Description

In etcd before versions 3.3.23 and 3.4.10, certain directory paths are created (etcd data directory and the directory path when provided to automatically generate self-signed certificates for TLS connections with clients) with restricted access permissions (700) by using the os.MkdirAll. This function does not perform any permission checks when a given directory path exists already. A possible workaround is to ensure the directories have the desired permission (700).

Affected products

• etcd-io etcd: before 3.3.23; from 3.4.0 before 3.4.10 — fixed in 3.3.23, 3.4.10
• Fedoraproject Fedora: 32

How to fix

Upgrade to a fixed version: etcd-io etcd 3.3.23, 3.4.10. Check the vendor advisory for mitigations.

References

• https://github.com/etcd-io/etcd/security/advisories/GHSA-chh6-ppwq-jh92
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L6B6R43Y7M3DCHWK3L3UVGE2K6WWECMP/
• https://github.com/etcd-io/etcd/security/advisories/GHSA-chh6-ppwq-jh92
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L6B6R43Y7M3DCHWK3L3UVGE2K6WWECMP/

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