CVE-2017-2670: Undertow core Undertow-core Vulnerability

MODERATE
Advisory Identifier: GHSA-3x7h-5hfr-hvjm
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CVSS 7.5
CWE-835
Published
Advisory Summary

CVE-2017-2670 is a MODERATE (CVSS 7.5) undertow-core vulnerability (CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')) affecting Undertow core libraries in the Maven ecosystem. The issue involves undertow-core. Remediation is available by upgrading affected packages to version 1.3.28.

CVE-2017-2670 at a Glance

CVE Identifier CVE-2017-2670
GHSA Identifier GHSA-3x7h-5hfr-hvjm
Severity MODERATE
CVSS v3.1 Base Score 7.5
CWE Classification CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')
Affected Product Undertow core
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 7.5

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

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 None (C:N)
Integrity None (I:N)
Availability High (A:H)

How to Fix CVE-2017-2670

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: 1.3.28 
<dependency>
    <groupId>io.undertow</groupId>
    <artifactId>undertow-core</artifactId>
    <version>1.3.28</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-2017-2670, 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 1.3.28), 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-835: Loop with Unreachable Exit Condition ('Infinite Loop'), where the product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop. 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

It was found in Undertow before 1.3.28 that with non-clean TCP close, the Websocket server gets into infinite loop on every IO thread, effectively causing DoS.

CVE-2017-2670 Affected Undertow core Versions

1 component(s)
Fixed Versions:
1.3.28
Product / Package Ecosystem Affected Versions Fixed Version
io.undertow:undertow-core
maven/io.undertow/undertow-core
Maven
< 1.3.28
1.3.28

References

NVD — CVE-2017-2670 NVD
https://nvd.nist.gov/vuln/detail/CVE-2017-2670
GitHub Advisory / Wiki ADVISORY
https://github.com/advisories/GHSA-3x7h-5hfr-hvjm

Frequently Asked Questions

What is CVE-2017-2670?
CVE-2017-2670 is a security vulnerability in Undertow core involving undertow-core under CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop').
Which Undertow core versions are affected?
Affected versions include releases prior to 1.3.28 across affected packages: io.undertow:undertow-core.
What version fixes CVE-2017-2670?
Upgrading to 1.3.28 (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 1.3.28. Upgrade your dependency to 1.3.28 or later.
What is the CVSS score of CVE-2017-2670?
CVE-2017-2670 has a CVSS v3.1 base score of 7.5 (MODERATE) with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2017-2670?
CVE-2017-2670 is classified under CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop') (The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop.).
How can I check Maven dependencies for CVE-2017-2670?
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-3x7h-5hfr-hvjm",
  "modified" : "2021-08-31T21:36:39Z",
  "published" : "2018-10-19T16:54:56Z",
  "aliases" : [ "CVE-2017-2670" ],
  "summary" : "Moderate severity vulnerability that affects io.undertow:undertow-core",
  "details" : "It was found in Undertow before 1.3.28 that with non-clean TCP close, the Websocket server gets into infinite loop on every IO thread, effectively causing DoS.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "io.undertow:undertow-core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.3.28"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2017-2670"
  }, {
    "type" : "ADVISORY",
    "url" : "https://github.com/advisories/GHSA-3x7h-5hfr-hvjm"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-835" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2020-06-16T20:56:49Z",
    "nvd_published_at" : null
  }
}