CVE-2019-12303: Github.com/rancher/rancher Rancher Code Injection Vulnerability

HIGH
Advisory Identifier: GHSA-53pj-67m4-9w98
Share
CVSS 8.8
CWE-74
Published
Advisory Summary

CVE-2019-12303 is a HIGH (CVSS 8.8) rancher code injection vulnerability (CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')) affecting Github.com/rancher/rancher libraries in the Go ecosystem. The issue involves rancher code injection via fluentd config commands. Remediation is available by upgrading affected packages to version 2.2.4.

CVE-2019-12303 at a Glance

CVE Identifier CVE-2019-12303
GHSA Identifier GHSA-53pj-67m4-9w98
Severity HIGH
CVSS v3.1 Base Score 8.8
CWE Classification CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
Affected Product Github.com/rancher/rancher
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 8.8

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).

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

How to Fix CVE-2019-12303

To remediate this vulnerability, upgrade all affected Github.com/rancher/rancher 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/rancher/rancher fixed: 2.2.4 
Upgrade github.com/rancher/rancher to 2.2.4
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/rancher/rancher

How to Check if You Are Affected

To determine whether your application is affected by CVE-2019-12303, inspect your project dependencies for Github.com/rancher/rancher:

inspect dependencies for github.com/rancher/rancher

Analyze the terminal output to locate any version of Github.com/rancher/rancher in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.2.4), 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-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection'), where the product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component. In Github.com/rancher/rancher, 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

In Rancher 2 through 2.2.3, Project owners can inject additional fluentd configuration to read files or execute arbitrary commands inside the fluentd container.

CVE-2019-12303 Affected Github.com/rancher/rancher Versions

1 component(s)
Fixed Versions:
2.2.4
Product / Package Ecosystem Affected Versions Fixed Version
github.com/rancher/rancher
golang/github.com/rancher/rancher
Go
≥ 2.0.0
< 2.2.4
2.2.4

References

NVD — CVE-2019-12303 NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-12303
forums.rancher.com/t/rancher-release-v... WEB
https://forums.rancher.com/t/rancher-release-v2-2-4-addresses-rancher-cve-2019-12274-and-cve-2019-12303/14466
Github.com/rancher/rancher Source Repository REPOSITORY
https://github.com/rancher/rancher

Frequently Asked Questions

What is CVE-2019-12303?
CVE-2019-12303 is a security vulnerability in Github.com/rancher/rancher involving Rancher code injection via fluentd config commands under CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection').
Which Github.com/rancher/rancher versions are affected?
Affected versions include releases prior to 2.2.4 across affected packages: github.com/rancher/rancher.
What version fixes CVE-2019-12303?
Upgrading to 2.2.4 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/rancher/rancher affected?
Yes, github.com/rancher/rancher is affected in releases prior to 2.2.4. Upgrade your dependency to 2.2.4 or later.
What is the CVSS score of CVE-2019-12303?
CVE-2019-12303 has a CVSS v3.1 base score of 8.8 (HIGH) with vector string CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2019-12303?
CVE-2019-12303 is classified under CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') (The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component.).
How can I check Go dependencies for CVE-2019-12303?
Run the dependency tree command: 'inspect dependencies for github.com/rancher/rancher'. 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-53pj-67m4-9w98",
  "modified" : "2024-04-24T21:01:44Z",
  "published" : "2022-05-24T16:47:29Z",
  "aliases" : [ "CVE-2019-12303" ],
  "summary" : "Rancher code injection via fluentd config commands",
  "details" : "In Rancher 2 through 2.2.3, Project owners can inject additional fluentd configuration to read files or execute arbitrary commands inside the fluentd container.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/rancher/rancher"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.0.0"
      }, {
        "fixed" : "2.2.4"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 2.2.3"
    }
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2019-12303"
  }, {
    "type" : "WEB",
    "url" : "https://forums.rancher.com/t/rancher-release-v2-2-4-addresses-rancher-cve-2019-12274-and-cve-2019-12303/14466"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/rancher/rancher"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-74" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-04-24T21:01:44Z",
    "nvd_published_at" : "2019-06-06T16:29:00Z"
  }
}