CVE-2022-2835: Github.com/coredns/coredns CoreDNS Vulnerable To Improper Restriction Vulnerability

MODERATE
Advisory Identifier: GHSA-ch7v-37xg-75ph
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CVSS 4.4
CWE-923
Published
Advisory Summary

CVE-2022-2835 is a MODERATE (CVSS 4.4) coredns vulnerable to improper restriction vulnerability (CWE-923: Improper Restriction of Communication Channel to Intended Endpoints) affecting Github.com/coredns/coredns libraries in the Go ecosystem. The issue involves coredns vulnerable to improper restriction of communication channel to intended endpoints. Remediation is available in the latest vendor maintenance releases.

CVE-2022-2835 at a Glance

CVE Identifier CVE-2022-2835
GHSA Identifier GHSA-ch7v-37xg-75ph
Severity MODERATE
CVSS v3.1 Base Score 4.4
CWE Classification CWE-923: Improper Restriction of Communication Channel to Intended Endpoints
Affected Product Github.com/coredns/coredns
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 4.4

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

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

How to Fix CVE-2022-2835

To remediate this vulnerability, upgrade all affected Github.com/coredns/coredns 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/coredns/coredns fixed: Latest secure release 
Upgrade github.com/coredns/coredns to Latest secure release
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/coredns/coredns

How to Check if You Are Affected

To determine whether your application is affected by CVE-2022-2835, inspect your project dependencies for Github.com/coredns/coredns:

inspect dependencies for github.com/coredns/coredns

Analyze the terminal output to locate any version of Github.com/coredns/coredns in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), 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-923: Improper Restriction of Communication Channel to Intended Endpoints, where the product establishes a communication channel to (or from) an endpoint for privileged or protected operations, but it does not properly ensure that it is communicating with the correct endpoint. In Github.com/coredns/coredns, 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

A flaw was found in coreDNS. This flaw allows a malicious user to reroute internal calls to some internal services that were accessed by the FQDN in a format of <service>.<namespace>.svc.

CVE-2022-2835 Affected Github.com/coredns/coredns Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
github.com/coredns/coredns
golang/github.com/coredns/coredns
Go
≤ 1.9.3

References

NVD — CVE-2022-2835 NVD
https://nvd.nist.gov/vuln/detail/CVE-2022-2835
bugzilla.redhat.com/show_bug.cgi WEB
https://bugzilla.redhat.com/show_bug.cgi?id=2118542
Github.com/coredns/coredns Source Repository REPOSITORY
https://github.com/coredns/coredns

Frequently Asked Questions

What is CVE-2022-2835?
CVE-2022-2835 is a security vulnerability in Github.com/coredns/coredns involving coreDNS vulnerable to Improper Restriction of Communication Channel to Intended Endpoints under CWE-923: Improper Restriction of Communication Channel to Intended Endpoints.
Which Github.com/coredns/coredns versions are affected?
Affected versions include releases prior to current release patches across affected packages: github.com/coredns/coredns.
What version fixes CVE-2022-2835?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/coredns/coredns affected?
Yes, github.com/coredns/coredns is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What is the CVSS score of CVE-2022-2835?
CVE-2022-2835 has a CVSS v3.1 base score of 4.4 (MODERATE) with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N.
What CWE is associated with CVE-2022-2835?
CVE-2022-2835 is classified under CWE-923: Improper Restriction of Communication Channel to Intended Endpoints (The product establishes a communication channel to (or from) an endpoint for privileged or protected operations, but it does not properly ensure that it is communicating with the correct endpoint.).
How can I check Go dependencies for CVE-2022-2835?
Run the dependency tree command: 'inspect dependencies for github.com/coredns/coredns'. 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-ch7v-37xg-75ph",
  "modified" : "2023-03-14T19:39:51Z",
  "published" : "2023-03-03T18:30:27Z",
  "aliases" : [ "CVE-2022-2835" ],
  "summary" : "coreDNS vulnerable to Improper Restriction of Communication Channel to Intended Endpoints",
  "details" : "A flaw was found in coreDNS. This flaw allows a malicious user to reroute internal calls to some internal services that were accessed by the FQDN in a format of <service>.<namespace>.svc.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/coredns/coredns"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "1.9.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2022-2835"
  }, {
    "type" : "WEB",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2118542"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/coredns/coredns"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-923" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-03-03T23:11:00Z",
    "nvd_published_at" : "2023-03-03T16:15:00Z"
  }
}