CVE-2021-23345: Software Server-side Request Forgery Vulnerability

MODERATE
Advisory Identifier: GHSA-r97h-mg64-mcjr
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CVSS 5.3
CWE-918
Published
Advisory Summary

CVE-2021-23345 is a MODERATE (CVSS 5.3) server-side request forgery vulnerability (CWE-918: Server-Side Request Forgery (SSRF)) affecting Software libraries in the Maven ecosystem. The issue involves server-side request forgery in github.com/thecodingmachine/gotenberg. Remediation is available in the latest vendor maintenance releases.

CVE-2021-23345 at a Glance

CVE Identifier CVE-2021-23345
GHSA Identifier GHSA-r97h-mg64-mcjr
Severity MODERATE
CVSS v3.1 Base Score 5.3
CWE Classification CWE-918: Server-Side Request Forgery (SSRF)
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 5.3

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:L/I:N/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 Low (C:L)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2021-23345

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

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

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2021-23345, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree

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

Note: The mvn dependency:tree 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-918: Server-Side Request Forgery (SSRF), where the web server receives a url or similar request from an upstream component and retrieves the contents of this url, but it does not sufficiently ensure that the request is being sent to the expected destination. In Software, 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

All versions of package github.com/thecodingmachine/gotenberg are vulnerable to Server-side Request Forgery (SSRF) via the /convert/html endpoint when the src attribute of an HTML element refers to an internal system file, such as <iframe src='file:///etc/passwd'>.

References

NVD — CVE-2021-23345 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-23345
Software Source Repository REPOSITORY
https://github.com/thecodingmachine/gotenberg/issues/261
snyk.io/vuln/snyk-golang-gi... WEB
https://snyk.io/vuln/SNYK-GOLANG-GITHUBCOMTHECODINGMACHINEGOTENBERG-1062043

Frequently Asked Questions

What is CVE-2021-23345?
CVE-2021-23345 is a security vulnerability in Software involving Server-side Request Forgery in github.com/thecodingmachine/gotenberg under CWE-918: Server-Side Request Forgery (SSRF).
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2021-23345?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2021-23345?
CVE-2021-23345 has a CVSS v3.1 base score of 5.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
What CWE is associated with CVE-2021-23345?
CVE-2021-23345 is classified under CWE-918: Server-Side Request Forgery (SSRF) (The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.).
How can I check Maven dependencies for CVE-2021-23345?
Run the dependency tree command: 'mvn dependency:tree'. 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-r97h-mg64-mcjr",
  "modified" : "2022-05-24T22:01:28Z",
  "published" : "2022-05-24T22:01:28Z",
  "aliases" : [ "CVE-2021-23345" ],
  "summary" : "Server-side Request Forgery in github.com/thecodingmachine/gotenberg",
  "details" : "All versions of package github.com/thecodingmachine/gotenberg are vulnerable to Server-side Request Forgery (SSRF) via the /convert/html endpoint when the src attribute of an HTML element refers to an internal system file, such as <iframe src='file:///etc/passwd'>.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-23345"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/thecodingmachine/gotenberg/issues/261"
  }, {
    "type" : "WEB",
    "url" : "https://snyk.io/vuln/SNYK-GOLANG-GITHUBCOMTHECODINGMACHINEGOTENBERG-1062043"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-918" ],
    "severity" : "MODERATE",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2021-02-26T18:15:00Z"
  }
}