CVE-2020-1695: Resteasy client Improper Input Validation Vulnerability

HIGH
Advisory Identifier: GHSA-63cq-ppq8-cw6g
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CVSS 7.5
CWE-20
Published
Advisory Summary

CVE-2020-1695 is a HIGH (CVSS 7.5) improper input validation vulnerability (CWE-20: Improper Input Validation) affecting Resteasy client libraries in the Maven ecosystem. The issue involves improper input validation in resteasy. Remediation is available by upgrading affected packages to version 4.6.0, 3.12.0.

CVE-2020-1695 at a Glance

CVE Identifier CVE-2020-1695
GHSA Identifier GHSA-63cq-ppq8-cw6g
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-20: Improper Input Validation
Affected Product Resteasy client
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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/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 None (C:N)
Integrity High (I:H)
Availability None (A:N)

How to Fix CVE-2020-1695

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

org.jboss.resteasy:resteasy-client fixed: 4.6.0 
<dependency>
    <groupId>org.jboss.resteasy</groupId>
    <artifactId>resteasy-client</artifactId>
    <version>4.6.0</version>
</dependency>
org.jboss.resteasy:resteasy-client fixed: 3.12.0 
<dependency>
    <groupId>org.jboss.resteasy</groupId>
    <artifactId>resteasy-client</artifactId>
    <version>3.12.0</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=org.jboss.resteasy

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2020-1695, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=org.jboss.resteasy

Analyze the terminal output to locate any version of Resteasy client in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 4.6.0), your application is affected.

Note: The mvn dependency:tree -Dincludes=org.jboss.resteasy 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-20: Improper Input Validation, where the product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. In Resteasy client, 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

A flaw was found in all resteasy 3.x.x versions prior to 3.12.0.Final and all resteasy 4.x.x versions prior to 4.6.0.Final, where an improper input validation results in returning an illegal header that integrates into the server's response. This flaw may result in an injection, which leads to unexpected behavior when the HTTP response is constructed.

CVE-2020-1695 Affected Resteasy client Versions

2 component(s)
Fixed Versions:
4.6.03.12.0
Product / Package Ecosystem Affected Versions Fixed Version
org.jboss.resteasy:resteasy-client
maven/org.jboss.resteasy/resteasy-client
Maven
≥ 4.0.0
< 4.6.0
4.6.0
org.jboss.resteasy:resteasy-client
maven/org.jboss.resteasy/resteasy-client
Maven
≥ 3.0.0
< 3.12.0
3.12.0

References

NVD — CVE-2020-1695 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-1695
Security Fix Commit FIX COMMIT
https://github.com/resteasy/Resteasy/commit/88ba8537f2e8d465c7031d352bf9bb25526ce475
bugzilla.redhat.com/show_bug.cgi WEB
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-1695
lists.fedoraproject.org/archives/list/packa... WEB
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/IJDMT443YZWCBS5NS76XZ7TL3GK7BXHL
lists.fedoraproject.org/archives/list/packa... WEB
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RX22C6I56BJUER76IIPYHGZIWBQIU3CQ

Frequently Asked Questions

What is CVE-2020-1695?
CVE-2020-1695 is a security vulnerability in Resteasy client involving Improper Input Validation in RESTEasy under CWE-20: Improper Input Validation.
Which Resteasy client versions are affected?
Affected versions include releases prior to 4.6.0, 3.12.0 across affected packages: org.jboss.resteasy:resteasy-client.
What version fixes CVE-2020-1695?
Upgrading to 4.6.0, 3.12.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is resteasy-client affected?
Yes, org.jboss.resteasy:resteasy-client is affected in releases prior to 4.6.0, 3.12.0. Upgrade your dependency to 4.6.0, 3.12.0 or later.
What is the CVSS score of CVE-2020-1695?
CVE-2020-1695 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
What CWE is associated with CVE-2020-1695?
CVE-2020-1695 is classified under CWE-20: Improper Input Validation (The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.).
How can I check Maven dependencies for CVE-2020-1695?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.jboss.resteasy'. 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-63cq-ppq8-cw6g",
  "modified" : "2022-06-24T01:25:36Z",
  "published" : "2022-05-24T22:01:21Z",
  "aliases" : [ "CVE-2020-1695" ],
  "summary" : "Improper Input Validation in RESTEasy",
  "details" : "A flaw was found in all resteasy 3.x.x versions prior to 3.12.0.Final and all resteasy 4.x.x versions prior to 4.6.0.Final, where an improper input validation results in returning an illegal header that integrates into the server's response. This flaw may result in an injection, which leads to unexpected behavior when the HTTP response is constructed.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.jboss.resteasy:resteasy-client"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "4.0.0"
      }, {
        "fixed" : "4.6.0"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 4.5.12"
    }
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.jboss.resteasy:resteasy-client"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "3.0.0"
      }, {
        "fixed" : "3.12.0"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 3.11.5"
    }
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-1695"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/resteasy/Resteasy/commit/88ba8537f2e8d465c7031d352bf9bb25526ce475"
  }, {
    "type" : "WEB",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-1695"
  }, {
    "type" : "WEB",
    "url" : "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/IJDMT443YZWCBS5NS76XZ7TL3GK7BXHL"
  }, {
    "type" : "WEB",
    "url" : "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RX22C6I56BJUER76IIPYHGZIWBQIU3CQ"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-20" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-06-24T01:25:36Z",
    "nvd_published_at" : "2020-05-19T15:15:00Z"
  }
}