Vulnerabilities in pkg:maven/io.ktor/ktor-client-core

PACKAGE
Advisory Identifier: GHSA-xwgq-pcqx-hpmv
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Advisory Summary

CVE-2019-19703 is a MODERATE (CVSS 6.1) url redirection to untrusted site vulnerability (CWE-601: URL Redirection to Untrusted Site ('Open Redirect')) affecting Ktor client core libraries in the Maven ecosystem. The issue involves url redirection to untrusted site (open redirect) in ktor. Remediation is available by upgrading affected packages to version 1.3.0.

1 Known Advisory Record(s)
Package Vulnerability Intelligence

pkg:maven/io.ktor/ktor-client-core

1 Known Advisory Record(s)

Vulnerability advisories affecting package pkg:maven/io.ktor/ktor-client-core. Select an advisory below to view technical details or fixes.

Advisory ID CVE / NVD Severity Summary
GHSA-xwgq-pcqx-hpmv CVE-2019-19703 MODERATE URL Redirection to Untrusted Site (Open Redirect) in Ktor

CVE-2019-19703 at a Glance

CVE Identifier CVE-2019-19703
GHSA Identifier GHSA-xwgq-pcqx-hpmv
Severity MODERATE
CVSS v3.1 Base Score 6.1
CWE Classification CWE-601: URL Redirection to Untrusted Site ('Open Redirect')
Affected Product Ktor client core
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 6.1

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:R/S:C/C:L/I:L/A:N).

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

How to Fix CVE-2019-19703

To remediate this vulnerability, upgrade all affected Ktor client 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.ktor:ktor-client-core fixed: 1.3.0 
<dependency>
    <groupId>io.ktor</groupId>
    <artifactId>ktor-client-core</artifactId>
    <version>1.3.0</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.ktor

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2019-19703, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=io.ktor

Analyze the terminal output to locate any version of Ktor client core in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.3.0), your application is affected.

Note: The mvn dependency:tree -Dincludes=io.ktor 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-601: URL Redirection to Untrusted Site ('Open Redirect'), where the web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect. In Ktor client 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

In Ktor through 1.2.6, the client resends data from the HTTP Authorization header to a redirect location.

CVE-2019-19703 Affected Ktor client core Versions

1 component(s)
Fixed Versions:
1.3.0
Product / Package Ecosystem Affected Versions Fixed Version
io.ktor:ktor-client-core
maven/io.ktor/ktor-client-core
Maven
< 1.3.0
1.3.0

References

NVD — CVE-2019-19703 NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-19703
Ktor client core Source Repository REPOSITORY
https://github.com/ktorio/ktor/issues/1467
Security Fix Commit FIX COMMIT
https://github.com/ktorio/ktor/commit/0c108156f45423d09014b47be810188629cb878f

Frequently Asked Questions

What is CVE-2019-19703?
CVE-2019-19703 is a security vulnerability in Ktor client core involving URL Redirection to Untrusted Site (Open Redirect) in Ktor under CWE-601: URL Redirection to Untrusted Site ('Open Redirect').
Which Ktor client core versions are affected?
Affected versions include releases prior to 1.3.0 across affected packages: io.ktor:ktor-client-core.
What version fixes CVE-2019-19703?
Upgrading to 1.3.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is ktor-client-core affected?
Yes, io.ktor:ktor-client-core is affected in releases prior to 1.3.0. Upgrade your dependency to 1.3.0 or later.
What is the CVSS score of CVE-2019-19703?
CVE-2019-19703 has a CVSS v3.1 base score of 6.1 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
What CWE is associated with CVE-2019-19703?
CVE-2019-19703 is classified under CWE-601: URL Redirection to Untrusted Site ('Open Redirect') (The web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect.).
How can I check Maven dependencies for CVE-2019-19703?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=io.ktor'. 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-xwgq-pcqx-hpmv",
  "modified" : "2021-08-19T16:56:45Z",
  "published" : "2020-02-12T18:45:50Z",
  "aliases" : [ "CVE-2019-19703" ],
  "summary" : "URL Redirection to Untrusted Site (Open Redirect) in Ktor",
  "details" : "In Ktor through 1.2.6, the client resends data from the HTTP Authorization header to a redirect location.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "io.ktor:ktor-client-core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.3.0"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 1.2.6"
    }
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2019-19703"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/ktorio/ktor/issues/1467"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/ktorio/ktor/commit/0c108156f45423d09014b47be810188629cb878f"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-601" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2020-02-11T17:33:16Z",
    "nvd_published_at" : null
  }
}