CVE-2021-46398: Github.com/filebrowser/filebrowser/v2 Cross-Site Request Forgery Vulnerability

HIGH
Advisory Identifier: GHSA-72wf-hwcq-65h9
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CVSS 8.8
CWE-352
Published
Advisory Summary

CVE-2021-46398 is a HIGH (CVSS 8.8) cross-site request forgery vulnerability (CWE-352: Cross-Site Request Forgery (CSRF)) affecting Github.com/filebrowser/filebrowser/v2 libraries in the Go ecosystem. The issue involves cross-site request forgery in filebrowser. Remediation is available by upgrading affected packages to version 2.18.0.

CVE-2021-46398 at a Glance

CVE Identifier CVE-2021-46398
GHSA Identifier GHSA-72wf-hwcq-65h9
Severity HIGH
CVSS v3.1 Base Score 8.8
CWE Classification CWE-352: Cross-Site Request Forgery (CSRF)
Affected Product Github.com/filebrowser/filebrowser/v2
Package Ecosystem Go
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:N/UI:R/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 Required (UI:R)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2021-46398

To remediate this vulnerability, upgrade all affected Github.com/filebrowser/filebrowser/v2 dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

github.com/filebrowser/filebrowser/v2 fixed: 2.18.0 
Upgrade github.com/filebrowser/filebrowser/v2 to 2.18.0
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 github.com/filebrowser/filebrowser/v2

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-46398, inspect your project dependencies for Github.com/filebrowser/filebrowser/v2:

inspect dependencies for github.com/filebrowser/filebrowser/v2

Analyze the terminal output to locate any version of Github.com/filebrowser/filebrowser/v2 in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.18.0), 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 Github.com/filebrowser/filebrowser/v2, 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 Cross-Site Request Forgery (CSRF) vulnerability exists in Filebrowser < 2.18.0 that allows attackers to create a backdoor user with admin privilege and get access to the filesystem via a malicious HTML webpage that is sent to the victim.

CVE-2021-46398 Affected Github.com/filebrowser/filebrowser/v2 Versions

1 component(s)
Fixed Versions:
2.18.0
Product / Package Ecosystem Affected Versions Fixed Version
github.com/filebrowser/filebrowser/v2
golang/github.com/filebrowser/filebrowser/v2
Go
< 2.18.0
2.18.0

References

NVD — CVE-2021-46398 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-46398
Github.com/filebrowser/filebrowser/v2 Source Repository REPOSITORY
https://github.com/filebrowser/filebrowser/issues/1621
Security Fix Commit FIX COMMIT
https://github.com/filebrowser/filebrowser/commit/74b7cd8e81840537a8206317344f118093153e8d
febin0x4e4a.blogspot.com/2022/01/critical-cs... WEB
https://febin0x4e4a.blogspot.com/2022/01/critical-csrf-in-filebrowser.html
febin0x4e4a.wordpress.com/2022/01/19/critical... WEB
https://febin0x4e4a.wordpress.com/2022/01/19/critical-csrf-in-filebrowser
febinj.medium.com/critical-csrf-to-rc... WEB
https://febinj.medium.com/critical-csrf-to-rce-in-filebrowser-865a3c34b8e7
Github.com/filebrowser/filebrowser/v2 Source Repository REPOSITORY
https://github.com/filebrowser/filebrowser
pkg.go.dev/vuln/go-2022-0563 WEB
https://pkg.go.dev/vuln/GO-2022-0563
systemweakness.com/critical-csrf-to-rc... WEB
https://systemweakness.com/critical-csrf-to-rce-in-filebrowser-865a3c34b8e7
Github.com/filebrowser/filebrowser/v2 Security Information SECURITY
http://packetstormsecurity.com/files/165885/FileBrowser-2.17.2-Code-Execution-Cross-Site-Request-Forgery.html

Frequently Asked Questions

What is CVE-2021-46398?
CVE-2021-46398 is a security vulnerability in Github.com/filebrowser/filebrowser/v2 involving Cross-Site Request Forgery in Filebrowser under CWE-352: Cross-Site Request Forgery (CSRF).
Which Github.com/filebrowser/filebrowser/v2 versions are affected?
Affected versions include releases prior to 2.18.0 across affected packages: github.com/filebrowser/filebrowser/v2.
What version fixes CVE-2021-46398?
Upgrading to 2.18.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/filebrowser/filebrowser/v2 affected?
Yes, github.com/filebrowser/filebrowser/v2 is affected in releases prior to 2.18.0. Upgrade your dependency to 2.18.0 or later.
What is the CVSS score of CVE-2021-46398?
CVE-2021-46398 has a CVSS v3.1 base score of 8.8 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2021-46398?
CVE-2021-46398 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 Go dependencies for CVE-2021-46398?
Run the dependency tree command: 'inspect dependencies for github.com/filebrowser/filebrowser/v2'. 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-72wf-hwcq-65h9",
  "modified" : "2024-05-20T21:22:49Z",
  "published" : "2022-02-05T00:00:31Z",
  "aliases" : [ "CVE-2021-46398" ],
  "summary" : "Cross-Site Request Forgery in Filebrowser",
  "details" : "A Cross-Site Request Forgery (CSRF) vulnerability exists in Filebrowser < 2.18.0 that allows attackers to create a backdoor user with admin privilege and get access to the filesystem via a malicious HTML webpage that is sent to the victim.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/filebrowser/filebrowser/v2"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.18.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-46398"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/filebrowser/filebrowser/issues/1621"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/filebrowser/filebrowser/commit/74b7cd8e81840537a8206317344f118093153e8d"
  }, {
    "type" : "WEB",
    "url" : "https://febin0x4e4a.blogspot.com/2022/01/critical-csrf-in-filebrowser.html"
  }, {
    "type" : "WEB",
    "url" : "https://febin0x4e4a.wordpress.com/2022/01/19/critical-csrf-in-filebrowser"
  }, {
    "type" : "WEB",
    "url" : "https://febinj.medium.com/critical-csrf-to-rce-in-filebrowser-865a3c34b8e7"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/filebrowser/filebrowser"
  }, {
    "type" : "WEB",
    "url" : "https://pkg.go.dev/vuln/GO-2022-0563"
  }, {
    "type" : "WEB",
    "url" : "https://systemweakness.com/critical-csrf-to-rce-in-filebrowser-865a3c34b8e7"
  }, {
    "type" : "WEB",
    "url" : "http://packetstormsecurity.com/files/165885/FileBrowser-2.17.2-Code-Execution-Cross-Site-Request-Forgery.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-352" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-02-08T18:32:54Z",
    "nvd_published_at" : "2022-02-04T16:15:00Z"
  }
}