CVE-2021-41745: Showdoc/showdoc Showdoc File Upload Vulnerability Vulnerability

CRITICAL
Advisory Identifier: GHSA-4286-h47h-m5v6
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CVSS 9.8
CWE-287 CWE-434
Published
Advisory Summary

CVE-2021-41745 is a CRITICAL (CVSS 9.8) showdoc file upload vulnerability vulnerability (CWE-287: Improper Authentication) affecting Showdoc/showdoc libraries in the Packagist ecosystem. The issue involves showdoc file upload vulnerability. Remediation is available by upgrading affected packages to version 2.8.5.

CVE-2021-41745 at a Glance

CVE Identifier CVE-2021-41745
GHSA Identifier GHSA-4286-h47h-m5v6
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-287: Improper Authentication
Affected Product Showdoc/showdoc
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 9.8

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:H/I:H/A:H).

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 High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2021-41745

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

showdoc/showdoc fixed: 2.8.5 
Upgrade showdoc/showdoc to 2.8.5
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for showdoc/showdoc

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-41745, inspect your project dependencies for Showdoc/showdoc:

inspect dependencies for showdoc/showdoc

Analyze the terminal output to locate any version of Showdoc/showdoc in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.8.5), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-287: Improper Authentication, where when an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. In Showdoc/showdoc, 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 file upload vulnerability exists in Showdoc 2.8.3, which can be exploited by an attacker to gain server privileges.

CVE-2021-41745 Affected Showdoc/showdoc Versions

1 component(s)
Fixed Versions:
2.8.5
Product / Package Ecosystem Affected Versions Fixed Version
showdoc/showdoc
 Packagist
< 2.8.5
2.8.5

References

NVD — CVE-2021-41745 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-41745
Security Fix Commit FIX COMMIT
https://github.com/star7th/showdoc/commit/aec3df841958059c1db9ab1af25acc2af81e4e0e
Showdoc/showdoc Source Repository REPOSITORY
https://github.com/purple-WL/SHOWDOC-file-upload-vulnerability
Showdoc/showdoc Source Repository REPOSITORY
https://github.com/star7th/showdoc
www.cnvd.org.cn/flaw/show/cnvd-2020... WEB
https://www.cnvd.org.cn/flaw/show/CNVD-2020-49480

Frequently Asked Questions

What is CVE-2021-41745?
CVE-2021-41745 is a security vulnerability in Showdoc/showdoc involving Showdoc File Upload Vulnerability under CWE-287: Improper Authentication.
Which Showdoc/showdoc versions are affected?
Affected versions include releases prior to 2.8.5 across affected packages: showdoc/showdoc.
What version fixes CVE-2021-41745?
Upgrading to 2.8.5 (or the latest patched release for your respective branch) resolves the vulnerability.
Is showdoc/showdoc affected?
Yes, showdoc/showdoc is affected in releases prior to 2.8.5. Upgrade your dependency to 2.8.5 or later.
What is the CVSS score of CVE-2021-41745?
CVE-2021-41745 has a CVSS v3.1 base score of 9.8 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2021-41745?
CVE-2021-41745 is classified under CWE-287: Improper Authentication (When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.).
How can I check Packagist dependencies for CVE-2021-41745?
Run the dependency tree command: 'inspect dependencies for showdoc/showdoc'. 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-4286-h47h-m5v6",
  "modified" : "2023-09-21T22:49:27Z",
  "published" : "2021-10-25T19:43:24Z",
  "aliases" : [ "CVE-2021-41745" ],
  "summary" : "Showdoc File Upload Vulnerability",
  "details" : "A file upload vulnerability exists in Showdoc 2.8.3, which can be exploited by an attacker to gain server privileges.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "showdoc/showdoc"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.8.5"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-41745"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/star7th/showdoc/commit/aec3df841958059c1db9ab1af25acc2af81e4e0e"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/purple-WL/SHOWDOC-file-upload-vulnerability"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/star7th/showdoc"
  }, {
    "type" : "WEB",
    "url" : "https://www.cnvd.org.cn/flaw/show/CNVD-2020-49480"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-287", "CWE-434" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-10-25T18:46:11Z",
    "nvd_published_at" : "2021-10-22T12:15:00Z"
  }
}