CVE-2023-25765: Email ext Sandbox Escape Vulnerability

CRITICAL
Advisory Identifier: GHSA-c9c2-wcxh-3w5j
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CVSS 9.9
CWE-693
Published
Advisory Summary

CVE-2023-25765 is a CRITICAL (CVSS 9.9) sandbox escape vulnerability (CWE-693: Protection Mechanism Failure) affecting Email ext libraries in the Maven ecosystem. The issue involves sandbox escape in jenkins email extension plugin. Remediation is available by upgrading affected packages to version 2.94.

CVE-2023-25765 at a Glance

CVE Identifier CVE-2023-25765
GHSA Identifier GHSA-c9c2-wcxh-3w5j
Severity CRITICAL
CVSS v3.1 Base Score 9.9
CWE Classification CWE-693: Protection Mechanism Failure
Affected Product Email ext
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 9.9

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:C/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 Changed (S:C)
Confidentiality High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2023-25765

To remediate this vulnerability, upgrade all affected Email ext 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:email-ext fixed: 2.94 
<dependency>
    <groupId>org.jenkins-ci.plugins</groupId>
    <artifactId>email-ext</artifactId>
    <version>2.94</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-2023-25765, 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 Email ext in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.94), 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-693: Protection Mechanism Failure, where the product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product. In Email ext, 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 Jenkins Email Extension Plugin 2.93 and earlier, templates defined inside a folder were not subject to Script Security protection, allowing attackers able to define email templates in folders to bypass the sandbox protection and execute arbitrary code in the context of the Jenkins controller JVM.

CVE-2023-25765 Affected Email ext Versions

1 component(s)
Fixed Versions:
2.94
Product / Package Ecosystem Affected Versions Fixed Version
org.jenkins-ci.plugins:email-ext
maven/org.jenkins-ci.plugins/email-ext
Maven
< 2.94
2.94

References

NVD — CVE-2023-25765 NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-25765
Security Fix Commit FIX COMMIT
https://github.com/jenkinsci/email-ext-plugin/commit/ffe44a4c1c1830325787d7ef5e9e19ebf9a936f9
Email ext Source Repository REPOSITORY
https://github.com/jenkinsci/email-ext-plugin
Email ext Security Information SECURITY
https://www.jenkins.io/security/advisory/2023-02-15/#SECURITY-2939
Email ext Security Information SECURITY
http://www.openwall.com/lists/oss-security/2023/02/15/4

Frequently Asked Questions

What is CVE-2023-25765?
CVE-2023-25765 is a security vulnerability in Email ext involving Sandbox escape in Jenkins Email Extension Plugin under CWE-693: Protection Mechanism Failure.
Which Email ext versions are affected?
Affected versions include releases prior to 2.94 across affected packages: org.jenkins-ci.plugins:email-ext.
What version fixes CVE-2023-25765?
Upgrading to 2.94 (or the latest patched release for your respective branch) resolves the vulnerability.
Is email-ext affected?
Yes, org.jenkins-ci.plugins:email-ext is affected in releases prior to 2.94. Upgrade your dependency to 2.94 or later.
What is the CVSS score of CVE-2023-25765?
CVE-2023-25765 has a CVSS v3.1 base score of 9.9 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.
What CWE is associated with CVE-2023-25765?
CVE-2023-25765 is classified under CWE-693: Protection Mechanism Failure (The product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product.).
How can I check Maven dependencies for CVE-2023-25765?
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-c9c2-wcxh-3w5j",
  "modified" : "2023-02-23T21:31:10Z",
  "published" : "2023-02-15T15:30:40Z",
  "aliases" : [ "CVE-2023-25765" ],
  "summary" : "Sandbox escape in Jenkins Email Extension Plugin",
  "details" : "In Jenkins Email Extension Plugin 2.93 and earlier, templates defined inside a folder were not subject to Script Security protection, allowing attackers able to define email templates in folders to bypass the sandbox protection and execute arbitrary code in the context of the Jenkins controller JVM.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.jenkins-ci.plugins:email-ext"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.94"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 2.93"
    }
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2023-25765"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/jenkinsci/email-ext-plugin/commit/ffe44a4c1c1830325787d7ef5e9e19ebf9a936f9"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/jenkinsci/email-ext-plugin"
  }, {
    "type" : "WEB",
    "url" : "https://www.jenkins.io/security/advisory/2023-02-15/#SECURITY-2939"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2023/02/15/4"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-693" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-02-15T18:29:32Z",
    "nvd_published_at" : "2023-02-15T14:15:00Z"
  }
}