CVE-2018-19148: Github.com/caddyserver/caddy Caddy Allows Enumeration Of Certificates Vulnerability

LOW
Advisory Identifier: GHSA-jf2w-mq6r-56v8
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CVSS 3.7
CWE-200
Published
Advisory Summary

CVE-2018-19148 is a LOW (CVSS 3.7) caddy allows enumeration of certificates vulnerability (CWE-200: Exposure of Sensitive Information to an Unauthorized Actor) affecting Github.com/caddyserver/caddy libraries in the Go ecosystem. The issue involves caddy allows enumeration of certificates and hostnames. Remediation is available by upgrading affected packages to version 0.11.1.

CVE-2018-19148 at a Glance

CVE Identifier CVE-2018-19148
GHSA Identifier GHSA-jf2w-mq6r-56v8
Severity LOW
CVSS v3.1 Base Score 3.7
CWE Classification CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
Affected Product Github.com/caddyserver/caddy
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 3.7

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/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 Low (C:L)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2018-19148

To remediate this vulnerability, upgrade all affected Github.com/caddyserver/caddy 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/caddyserver/caddy fixed: 0.11.1 
Upgrade github.com/caddyserver/caddy to 0.11.1
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/caddyserver/caddy

How to Check if You Are Affected

To determine whether your application is affected by CVE-2018-19148, inspect your project dependencies for Github.com/caddyserver/caddy:

inspect dependencies for github.com/caddyserver/caddy

Analyze the terminal output to locate any version of Github.com/caddyserver/caddy in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.11.1), 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-200: Exposure of Sensitive Information to an Unauthorized Actor, where the product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. In Github.com/caddyserver/caddy, 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

Caddy through 0.11.0 sends incorrect certificates for certain invalid requests, making it easier for attackers to enumerate hostnames. Specifically, when unable to match a Host header with a vhost in its configuration, it serves the X.509 certificate for a randomly selected vhost in its configuration. Repeated requests (with a nonexistent hostname in the Host header) permit full enumeration of all certificates on the server. This generally permits an attacker to easily and accurately discover the existence of and relationships among hostnames that weren't meant to be public, though this information could likely have been discovered via other methods with additional effort.

CVE-2018-19148 Affected Github.com/caddyserver/caddy Versions

1 component(s)
Fixed Versions:
0.11.1
Product / Package Ecosystem Affected Versions Fixed Version
github.com/caddyserver/caddy
golang/github.com/caddyserver/caddy
Go
< 0.11.1
0.11.1

References

NVD — CVE-2018-19148 NVD
https://nvd.nist.gov/vuln/detail/CVE-2018-19148
Github.com/caddyserver/caddy Source Repository REPOSITORY
https://github.com/mholt/caddy/issues/1303
Github.com/caddyserver/caddy Source Repository REPOSITORY
https://github.com/mholt/caddy/issues/2334
Github.com/caddyserver/caddy Source Repository REPOSITORY
https://github.com/mholt/caddy/pull/2015
Security Fix Commit FIX COMMIT
https://github.com/caddyserver/caddy/commit/986d4ffe3de32dcb81d334d603a2f0f1d460eb2f
Security Fix Commit FIX COMMIT
https://github.com/caddyserver/caddy/commit/f6e50890b3d81cb04146bd7b2c2b59e99830849a
Github.com/caddyserver/caddy Source Repository REPOSITORY
https://github.com/caddyserver/caddy
Github.com/caddyserver/caddy Security Information SECURITY
https://securitytrails.com/blog/caddy-web-server-ssl-bug

Frequently Asked Questions

What is CVE-2018-19148?
CVE-2018-19148 is a security vulnerability in Github.com/caddyserver/caddy involving Caddy allows enumeration of Certificates and Hostnames under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor.
Which Github.com/caddyserver/caddy versions are affected?
Affected versions include releases prior to 0.11.1 across affected packages: github.com/caddyserver/caddy.
What version fixes CVE-2018-19148?
Upgrading to 0.11.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/caddyserver/caddy affected?
Yes, github.com/caddyserver/caddy is affected in releases prior to 0.11.1. Upgrade your dependency to 0.11.1 or later.
What is the CVSS score of CVE-2018-19148?
CVE-2018-19148 has a CVSS v3.1 base score of 3.7 (LOW) with vector string CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N.
What CWE is associated with CVE-2018-19148?
CVE-2018-19148 is classified under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor (The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.).
How can I check Go dependencies for CVE-2018-19148?
Run the dependency tree command: 'inspect dependencies for github.com/caddyserver/caddy'. 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-jf2w-mq6r-56v8",
  "modified" : "2024-04-24T20:08:56Z",
  "published" : "2022-05-14T01:37:58Z",
  "aliases" : [ "CVE-2018-19148" ],
  "summary" : "Caddy allows enumeration of Certificates and Hostnames",
  "details" : "Caddy through 0.11.0 sends incorrect certificates for certain invalid requests, making it easier for attackers to enumerate hostnames. Specifically, when unable to match a Host header with a vhost in its configuration, it serves the X.509 certificate for a randomly selected vhost in its configuration. Repeated requests (with a nonexistent hostname in the Host header) permit full enumeration of all certificates on the server. This generally permits an attacker to easily and accurately discover the existence of and relationships among hostnames that weren't meant to be public, though this information could likely have been discovered via other methods with additional effort.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/caddyserver/caddy"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.11.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2018-19148"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/mholt/caddy/issues/1303"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/mholt/caddy/issues/2334"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/mholt/caddy/pull/2015"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/caddyserver/caddy/commit/986d4ffe3de32dcb81d334d603a2f0f1d460eb2f"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/caddyserver/caddy/commit/f6e50890b3d81cb04146bd7b2c2b59e99830849a"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/caddyserver/caddy"
  }, {
    "type" : "WEB",
    "url" : "https://securitytrails.com/blog/caddy-web-server-ssl-bug"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-200" ],
    "severity" : "LOW",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-04-24T20:08:56Z",
    "nvd_published_at" : "2018-11-10T19:29:00Z"
  }
}