CVE-2019-19794: Github.com/miekg/dns Miekg/dns Insecurely Generates Random Numbers Vulnerability

MODERATE
Advisory Identifier: GHSA-44r7-7p62-q3fr
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CVSS 5.9
CWE-338 CWE-330
Published
Advisory Summary

CVE-2019-19794 is a MODERATE (CVSS 5.9) miekg/dns insecurely generates random numbers vulnerability (CWE-338: Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)) affecting Github.com/miekg/dns libraries in the Go ecosystem. The issue involves miekg/dns insecurely generates random numbers. Remediation is available by upgrading affected packages to version 1.1.25.

CVE-2019-19794 at a Glance

CVE Identifier CVE-2019-19794
GHSA Identifier GHSA-44r7-7p62-q3fr
Severity MODERATE
CVSS v3.1 Base Score 5.9
CWE Classification CWE-338: Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
Affected Product Github.com/miekg/dns
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 5.9

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

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

How to Fix CVE-2019-19794

To remediate this vulnerability, upgrade all affected Github.com/miekg/dns 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/miekg/dns fixed: 1.1.25 
Upgrade github.com/miekg/dns to 1.1.25
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/miekg/dns

How to Check if You Are Affected

To determine whether your application is affected by CVE-2019-19794, inspect your project dependencies for Github.com/miekg/dns:

inspect dependencies for github.com/miekg/dns

Analyze the terminal output to locate any version of Github.com/miekg/dns in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.1.25), 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-338: Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG), where the product uses a pseudo-random number generator (prng) in a security context, but the prng's algorithm is not cryptographically strong. In Github.com/miekg/dns, 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

The miekg Go DNS package before 1.1.25, as used in CoreDNS before 1.6.6 and other products, improperly generates random numbers because math/rand is used. The TXID becomes predictable, leading to response forgeries.

CVE-2019-19794 Affected Github.com/miekg/dns Versions

1 component(s)
Fixed Versions:
1.1.25
Product / Package Ecosystem Affected Versions Fixed Version
github.com/miekg/dns
golang/github.com/miekg/dns
Go
< 1.1.25
1.1.25

References

NVD — CVE-2019-19794 NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-19794
Github.com/miekg/dns Source Repository REPOSITORY
https://github.com/coredns/coredns/issues/3519
Github.com/miekg/dns Source Repository REPOSITORY
https://github.com/coredns/coredns/issues/3547
Github.com/miekg/dns Source Repository REPOSITORY
https://github.com/miekg/dns/issues/1037
Github.com/miekg/dns Source Repository REPOSITORY
https://github.com/miekg/dns/issues/1043
Github.com/miekg/dns Source Repository REPOSITORY
https://github.com/miekg/dns/pull/1044
Security Fix Commit FIX COMMIT
https://github.com/miekg/dns/commit/8ebf2e419df7857ac8919baa05248789a8ffbf33
Github.com/miekg/dns Source Repository REPOSITORY
https://github.com/miekg/dns/compare/v1.1.24...v1.1.25
pkg.go.dev/vuln/go-2020-0008 WEB
https://pkg.go.dev/vuln/GO-2020-0008

Frequently Asked Questions

What is CVE-2019-19794?
CVE-2019-19794 is a security vulnerability in Github.com/miekg/dns involving miekg/dns insecurely generates random numbers under CWE-338: Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG).
Which Github.com/miekg/dns versions are affected?
Affected versions include releases prior to 1.1.25 across affected packages: github.com/miekg/dns.
What version fixes CVE-2019-19794?
Upgrading to 1.1.25 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/miekg/dns affected?
Yes, github.com/miekg/dns is affected in releases prior to 1.1.25. Upgrade your dependency to 1.1.25 or later.
What is the CVSS score of CVE-2019-19794?
CVE-2019-19794 has a CVSS v3.1 base score of 5.9 (MODERATE) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N.
What CWE is associated with CVE-2019-19794?
CVE-2019-19794 is classified under CWE-338: Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG) (The product uses a Pseudo-Random Number Generator (PRNG) in a security context, but the PRNG's algorithm is not cryptographically strong.).
How can I check Go dependencies for CVE-2019-19794?
Run the dependency tree command: 'inspect dependencies for github.com/miekg/dns'. 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-44r7-7p62-q3fr",
  "modified" : "2023-08-29T22:33:25Z",
  "published" : "2021-05-18T21:09:13Z",
  "aliases" : [ "CVE-2019-19794" ],
  "summary" : "miekg/dns insecurely generates random numbers",
  "details" : "The miekg Go DNS package before 1.1.25, as used in CoreDNS before 1.6.6 and other products, improperly generates random numbers because math/rand is used. The TXID becomes predictable, leading to response forgeries.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/miekg/dns"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.1.25"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2019-19794"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/coredns/coredns/issues/3519"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/coredns/coredns/issues/3547"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/miekg/dns/issues/1037"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/miekg/dns/issues/1043"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/miekg/dns/pull/1044"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/miekg/dns/commit/8ebf2e419df7857ac8919baa05248789a8ffbf33"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/miekg/dns/compare/v1.1.24...v1.1.25"
  }, {
    "type" : "WEB",
    "url" : "https://pkg.go.dev/vuln/GO-2020-0008"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-330", "CWE-338" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-05-18T20:42:52Z",
    "nvd_published_at" : null
  }
}