CVE-2023-41939: Ssh2easy Disabled Permissions Can Be Granted Vulnerability

HIGH
Advisory Identifier: GHSA-4gh2-m88h-8cj8
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CVSS 8.8
CWE-281
Published
Advisory Summary

CVE-2023-41939 is a HIGH (CVSS 8.8) disabled permissions can be granted vulnerability (CWE-281: Improper Preservation of Permissions) affecting Ssh2easy libraries in the Maven ecosystem. The issue involves disabled permissions can be granted by jenkins ssh2 easy plugin. Remediation is available by upgrading affected packages to version 1.6.

CVE-2023-41939 at a Glance

CVE Identifier CVE-2023-41939
GHSA Identifier GHSA-4gh2-m88h-8cj8
Severity HIGH
CVSS v3.1 Base Score 8.8
CWE Classification CWE-281: Improper Preservation of Permissions
Affected Product Ssh2easy
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 8.8

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

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

How to Fix CVE-2023-41939

To remediate this vulnerability, upgrade all affected Ssh2easy 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.jenkins-ci.plugins:ssh2easy fixed: 1.6 
<dependency>
    <groupId>org.jenkins-ci.plugins</groupId>
    <artifactId>ssh2easy</artifactId>
    <version>1.6</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.jenkins-ci.plugins

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2023-41939, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=org.jenkins-ci.plugins

Analyze the terminal output to locate any version of Ssh2easy in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.6), your application is affected.

Note: The mvn dependency:tree -Dincludes=org.jenkins-ci.plugins 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-281: Improper Preservation of Permissions, where the product does not preserve permissions or incorrectly preserves permissions when copying, restoring, or sharing objects, which can cause them to have less restrictive permissions than intended. In Ssh2easy, 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

Jenkins SSH2 Easy Plugin 1.4 and earlier does not verify that permissions configured to be granted are enabled, potentially allowing users formerly granted (typically optional permissions, like Overall/Manage) to access functionality they're no longer entitled to.

CVE-2023-41939 Affected Ssh2easy Versions

1 component(s)
Fixed Versions:
1.6
Product / Package Ecosystem Affected Versions Fixed Version
org.jenkins-ci.plugins:ssh2easy
maven/org.jenkins-ci.plugins/ssh2easy
Maven
< 1.6
1.6

References

NVD — CVE-2023-41939 NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-41939
Ssh2easy Security Information SECURITY
https://www.jenkins.io/security/advisory/2023-09-06/#SECURITY-3064
Ssh2easy Security Information SECURITY
http://www.openwall.com/lists/oss-security/2023/09/06/9

Frequently Asked Questions

What is CVE-2023-41939?
CVE-2023-41939 is a security vulnerability in Ssh2easy involving Disabled permissions can be granted by Jenkins SSH2 Easy Plugin under CWE-281: Improper Preservation of Permissions.
Which Ssh2easy versions are affected?
Affected versions include releases prior to 1.6 across affected packages: org.jenkins-ci.plugins:ssh2easy.
What version fixes CVE-2023-41939?
Upgrading to 1.6 (or the latest patched release for your respective branch) resolves the vulnerability.
Is ssh2easy affected?
Yes, org.jenkins-ci.plugins:ssh2easy is affected in releases prior to 1.6. Upgrade your dependency to 1.6 or later.
What is the CVSS score of CVE-2023-41939?
CVE-2023-41939 has a CVSS v3.1 base score of 8.8 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2023-41939?
CVE-2023-41939 is classified under CWE-281: Improper Preservation of Permissions (The product does not preserve permissions or incorrectly preserves permissions when copying, restoring, or sharing objects, which can cause them to have less restrictive permissions than intended.).
How can I check Maven dependencies for CVE-2023-41939?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.jenkins-ci.plugins'. 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-4gh2-m88h-8cj8",
  "modified" : "2024-01-30T23:07:24Z",
  "published" : "2023-09-06T15:30:26Z",
  "aliases" : [ "CVE-2023-41939" ],
  "summary" : "Disabled permissions can be granted by Jenkins SSH2 Easy Plugin",
  "details" : "Jenkins SSH2 Easy Plugin 1.4 and earlier does not verify that permissions configured to be granted are enabled, potentially allowing users formerly granted (typically optional permissions, like Overall/Manage) to access functionality they're no longer entitled to.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.jenkins-ci.plugins:ssh2easy"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.6"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2023-41939"
  }, {
    "type" : "WEB",
    "url" : "https://www.jenkins.io/security/advisory/2023-09-06/#SECURITY-3064"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2023/09/06/9"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-281" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-01-30T23:07:24Z",
    "nvd_published_at" : "2023-09-06T13:15:10Z"
  }
}