CVE-2020-15113: Github.com/etcd io/etcd Improper Preservation Of Permissions Vulnerability

MODERATE
Advisory Identifier: GHSA-chh6-ppwq-jh92
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CVSS 5.7
CWE-281
Published
Advisory Summary

CVE-2020-15113 is a MODERATE (CVSS 5.7) improper preservation of permissions vulnerability (CWE-281: Improper Preservation of Permissions) affecting Github.com/etcd io/etcd libraries in the Go ecosystem. The issue involves improper preservation of permissions in etcd. Remediation is available by upgrading affected packages to version 3.4.10, 3.3.23.

CVE-2020-15113 at a Glance

CVE Identifier CVE-2020-15113
GHSA Identifier GHSA-chh6-ppwq-jh92
Severity MODERATE
CVSS v3.1 Base Score 5.7
CWE Classification CWE-281: Improper Preservation of Permissions
Affected Product Github.com/etcd io/etcd
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 5.7

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N).

Attack Vector Local (AV:L)
Attack Complexity High (AC:H)
Privileges Required High (PR:H)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability None (A:N)

How to Fix CVE-2020-15113

To remediate this vulnerability, upgrade all affected Github.com/etcd io/etcd dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

github.com/etcd-io/etcd fixed: 3.4.10 
Upgrade github.com/etcd-io/etcd to 3.4.10
github.com/etcd-io/etcd fixed: 3.3.23 
Upgrade github.com/etcd-io/etcd to 3.3.23
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for github.com/etcd-io/etcd

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-15113, inspect your project dependencies for Github.com/etcd io/etcd:

inspect dependencies for github.com/etcd-io/etcd

Analyze the terminal output to locate any version of Github.com/etcd io/etcd in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.4.10), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-281: Improper Preservation of Permissions, where the product does not preserve permissions or incorrectly preserves permissions when copying, restoring, or sharing objects, which can cause them to have less restrictive permissions than intended. In Github.com/etcd io/etcd, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Vulnerability type Access Controls ### Detail etcd creates certain directory paths (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. ### Specific Go Package Affected github.com/etcd-io/etcd/pkg/fileutil ### Workarounds Make sure these directories have the desired permit (700). ### 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)

CVE-2020-15113 Affected Github.com/etcd io/etcd Versions

2 component(s)
Fixed Versions:
3.4.103.3.23
Product / Package Ecosystem Affected Versions Fixed Version
github.com/etcd-io/etcd
golang/github.com/etcd-io/etcd
Go
≥ 3.4.0-rc.0
< 3.4.10
3.4.10
github.com/etcd-io/etcd
golang/github.com/etcd-io/etcd
Go
< 3.3.23
3.3.23

References

GitHub Advisory / Wiki ADVISORY
https://github.com/etcd-io/etcd/security/advisories/GHSA-chh6-ppwq-jh92
NVD — CVE-2020-15113 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-15113
Security Fix Commit FIX COMMIT
https://github.com/etcd-io/etcd/commit/6be5c54c94298ae6746a574d2af8227d0c9a998b
Security Fix Commit FIX COMMIT
https://github.com/etcd-io/etcd/commit/e5424fc474b274c9e6b5205165015bc2035745f2
lists.fedoraproject.org/archives/list/packa... WEB
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/L6B6R43Y7M3DCHWK3L3UVGE2K6WWECMP

Frequently Asked Questions

What is CVE-2020-15113?
CVE-2020-15113 is a security vulnerability in Github.com/etcd io/etcd involving Improper Preservation of Permissions in etcd under CWE-281: Improper Preservation of Permissions.
Which Github.com/etcd io/etcd versions are affected?
Affected versions include releases prior to 3.4.10, 3.3.23 across affected packages: github.com/etcd-io/etcd.
What version fixes CVE-2020-15113?
Upgrading to 3.4.10, 3.3.23 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/etcd-io/etcd affected?
Yes, github.com/etcd-io/etcd is affected in releases prior to 3.4.10, 3.3.23. Upgrade your dependency to 3.4.10, 3.3.23 or later.
What is the CVSS score of CVE-2020-15113?
CVE-2020-15113 has a CVSS v3.1 base score of 5.7 (MODERATE) with vector string CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N.
What CWE is associated with CVE-2020-15113?
CVE-2020-15113 is classified under CWE-281: Improper Preservation of Permissions (The product does not preserve permissions or incorrectly preserves permissions when copying, restoring, or sharing objects, which can cause them to have less restrictive permissions than intended.).
How can I check Go dependencies for CVE-2020-15113?
Run the dependency tree command: 'inspect dependencies for github.com/etcd-io/etcd'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-chh6-ppwq-jh92",
  "modified" : "2024-01-30T23:54:26Z",
  "published" : "2024-01-30T23:54:26Z",
  "aliases" : [ "CVE-2020-15113" ],
  "summary" : "Improper Preservation of Permissions in etcd",
  "details" : "### Vulnerability type\nAccess Controls\n\n### Detail\netcd creates certain directory paths (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.\n### Specific Go Package Affected\ngithub.com/etcd-io/etcd/pkg/fileutil\n### Workarounds\nMake sure these directories have the desired permit (700).\n\n### References\nFind out more on this vulnerability in the [security audit report](https://github.com/etcd-io/etcd/blob/master/security/SECURITY_AUDIT.pdf)\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Contact the [etcd security committee](https://github.com/etcd-io/etcd/blob/master/security/security-release-process.md#product-security-committee-psc)",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/etcd-io/etcd"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "3.4.0-rc.0"
      }, {
        "fixed" : "3.4.10"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/etcd-io/etcd"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "3.3.23"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/etcd-io/etcd/security/advisories/GHSA-chh6-ppwq-jh92"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-15113"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/etcd-io/etcd/commit/6be5c54c94298ae6746a574d2af8227d0c9a998b"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/etcd-io/etcd/commit/e5424fc474b274c9e6b5205165015bc2035745f2"
  }, {
    "type" : "WEB",
    "url" : "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/L6B6R43Y7M3DCHWK3L3UVGE2K6WWECMP"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-281" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-01-30T23:54:26Z",
    "nvd_published_at" : "2020-08-05T20:15:00Z"
  }
}