CVE-2021-3776: Showdoc/showdoc Showdoc Is Vulnerable To Cross-Site Vulnerability

MODERATE
Advisory Identifier: GHSA-m4hj-wg2r-qpcr
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CVSS 4.3
CWE-352
Published
Advisory Summary

CVE-2021-3776 is a MODERATE (CVSS 4.3) showdoc is vulnerable to cross-site vulnerability (CWE-352: Cross-Site Request Forgery (CSRF)) affecting Showdoc/showdoc libraries in the Packagist ecosystem. The issue involves showdoc is vulnerable to cross-site request forgery (csrf). Remediation is available by upgrading affected packages to version 2.9.13.

CVE-2021-3776 at a Glance

CVE Identifier CVE-2021-3776
GHSA Identifier GHSA-m4hj-wg2r-qpcr
Severity MODERATE
CVSS v3.1 Base Score 4.3
CWE Classification CWE-352: Cross-Site Request Forgery (CSRF)
Affected Product Showdoc/showdoc
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 4.3

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L).

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

How to Fix CVE-2021-3776

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: 2.9.13 
Upgrade showdoc/showdoc to 2.9.13
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-2021-3776, 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 2.9.13), 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-352: Cross-Site Request Forgery (CSRF), where the web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor. 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

showdoc is vulnerable to Cross-Site Request Forgery (CSRF).

CVE-2021-3776 Affected Showdoc/showdoc Versions

1 component(s)
Fixed Versions:
2.9.13
Product / Package Ecosystem Affected Versions Fixed Version
showdoc/showdoc
 Packagist
< 2.9.13
2.9.13

References

NVD — CVE-2021-3776 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-3776
Security Fix Commit FIX COMMIT
https://github.com/star7th/showdoc/commit/67093c879a6563aa6ee08003177777d1975e2351
Showdoc/showdoc Source Repository REPOSITORY
https://github.com/star7th/showdoc
huntr.dev/bounties/e0edf27d-4... WEB
https://huntr.dev/bounties/e0edf27d-437e-44fe-907a-df020f385304

Frequently Asked Questions

What is CVE-2021-3776?
CVE-2021-3776 is a security vulnerability in Showdoc/showdoc involving showdoc is vulnerable to Cross-Site Request Forgery (CSRF) under CWE-352: Cross-Site Request Forgery (CSRF).
Which Showdoc/showdoc versions are affected?
Affected versions include releases prior to 2.9.13 across affected packages: showdoc/showdoc.
What version fixes CVE-2021-3776?
Upgrading to 2.9.13 (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 2.9.13. Upgrade your dependency to 2.9.13 or later.
What is the CVSS score of CVE-2021-3776?
CVE-2021-3776 has a CVSS v3.1 base score of 4.3 (MODERATE) with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L.
What CWE is associated with CVE-2021-3776?
CVE-2021-3776 is classified under CWE-352: Cross-Site Request Forgery (CSRF) (The web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor.).
How can I check Packagist dependencies for CVE-2021-3776?
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-m4hj-wg2r-qpcr",
  "modified" : "2021-11-17T21:10:57Z",
  "published" : "2021-11-15T23:13:34Z",
  "aliases" : [ "CVE-2021-3776" ],
  "summary" : "showdoc is vulnerable to Cross-Site Request Forgery (CSRF)",
  "details" : "showdoc is vulnerable to Cross-Site Request Forgery (CSRF).",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "showdoc/showdoc"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.9.13"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 2.9.12"
    }
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-3776"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/star7th/showdoc/commit/67093c879a6563aa6ee08003177777d1975e2351"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/star7th/showdoc"
  }, {
    "type" : "WEB",
    "url" : "https://huntr.dev/bounties/e0edf27d-437e-44fe-907a-df020f385304"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-352" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-11-15T19:41:42Z",
    "nvd_published_at" : "2021-11-13T10:15:00Z"
  }
}