CVE-2018-14642: Undertow core Exposure Of Sensitive Information To Vulnerability

MODERATE
Advisory Identifier: GHSA-vf6r-mmhc-3xcm
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CVSS 5.3
CWE-200
Published
Advisory Summary

CVE-2018-14642 is a MODERATE (CVSS 5.3) exposure of sensitive information to vulnerability (CWE-200: Exposure of Sensitive Information to an Unauthorized Actor) affecting Undertow core libraries in the Maven ecosystem. The issue involves exposure of sensitive information to an unauthorized actor in undertow. Remediation is available by upgrading affected packages to version 2.0.19.FINAL.

CVE-2018-14642 at a Glance

CVE Identifier CVE-2018-14642
GHSA Identifier GHSA-vf6r-mmhc-3xcm
Severity MODERATE
CVSS v3.1 Base Score 5.3
CWE Classification CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
Affected Product Undertow core
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 5.3

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

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
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-2018-14642

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

io.undertow:undertow-core fixed: 2.0.19.FINAL 
<dependency>
    <groupId>io.undertow</groupId>
    <artifactId>undertow-core</artifactId>
    <version>2.0.19.FINAL</version>
</dependency>
Verify Direct and Transitive Dependencies

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

mvn dependency:tree -Dincludes=io.undertow

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2018-14642, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=io.undertow

Analyze the terminal output to locate any version of Undertow core in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.0.19.FINAL), your application is affected.

Note: The mvn dependency:tree -Dincludes=io.undertow command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

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 Undertow core, 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

An information leak vulnerability was found in Undertow. If all headers are not written out in the first write() call then the code that handles flushing the buffer will always write out the full contents of the writevBuffer buffer, which may contain data from previous requests.

CVE-2018-14642 Affected Undertow core Versions

1 component(s)
Fixed Versions:
2.0.19.FINAL
Product / Package Ecosystem Affected Versions Fixed Version
io.undertow:undertow-core
maven/io.undertow/undertow-core
Maven
< 2.0.19.FINAL
2.0.19.FINAL

References

NVD — CVE-2018-14642 NVD
https://nvd.nist.gov/vuln/detail/CVE-2018-14642
access.redhat.com/errata/rhsa-2019:03... WEB
https://access.redhat.com/errata/RHSA-2019:0362
access.redhat.com/errata/rhsa-2019:03... WEB
https://access.redhat.com/errata/RHSA-2019:0364
access.redhat.com/errata/rhsa-2019:03... WEB
https://access.redhat.com/errata/RHSA-2019:0365
access.redhat.com/errata/rhsa-2019:03... WEB
https://access.redhat.com/errata/RHSA-2019:0380
access.redhat.com/errata/rhsa-2019:11... WEB
https://access.redhat.com/errata/RHSA-2019:1106
access.redhat.com/errata/rhsa-2019:11... WEB
https://access.redhat.com/errata/RHSA-2019:1107
access.redhat.com/errata/rhsa-2019:11... WEB
https://access.redhat.com/errata/RHSA-2019:1108
access.redhat.com/errata/rhsa-2019:11... WEB
https://access.redhat.com/errata/RHSA-2019:1140
bugzilla.redhat.com/show_bug.cgi WEB
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-14642

Frequently Asked Questions

What is CVE-2018-14642?
CVE-2018-14642 is a security vulnerability in Undertow core involving Exposure of Sensitive Information to an Unauthorized Actor in Undertow under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor.
Which Undertow core versions are affected?
Affected versions include releases prior to 2.0.19.FINAL across affected packages: io.undertow:undertow-core.
What version fixes CVE-2018-14642?
Upgrading to 2.0.19.FINAL (or the latest patched release for your respective branch) resolves the vulnerability.
Is undertow-core affected?
Yes, io.undertow:undertow-core is affected in releases prior to 2.0.19.FINAL. Upgrade your dependency to 2.0.19.FINAL or later.
What is the CVSS score of CVE-2018-14642?
CVE-2018-14642 has a CVSS v3.1 base score of 5.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
What CWE is associated with CVE-2018-14642?
CVE-2018-14642 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 Maven dependencies for CVE-2018-14642?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=io.undertow'. 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-vf6r-mmhc-3xcm",
  "modified" : "2022-06-29T19:11:47Z",
  "published" : "2022-05-13T01:12:21Z",
  "aliases" : [ "CVE-2018-14642" ],
  "summary" : "Exposure of Sensitive Information to an Unauthorized Actor in Undertow",
  "details" : "An information leak vulnerability was found in Undertow. If all headers are not written out in the first write() call then the code that handles flushing the buffer will always write out the full contents of the writevBuffer buffer, which may contain data from previous requests.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "io.undertow:undertow-core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.0.19.FINAL"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 2.0.18.FINAL"
    }
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2018-14642"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2019:0362"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2019:0364"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2019:0365"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2019:0380"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2019:1106"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2019:1107"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2019:1108"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2019:1140"
  }, {
    "type" : "WEB",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-14642"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-200" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-06-29T19:11:47Z",
    "nvd_published_at" : "2018-09-18T13:29:00Z"
  }
}