CVE-2021-39391: Github.com/beego/beego/v2 Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-c77f-4rgj-jfr4
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CVSS 6.1
CWE-64 CWE-79
Published
Advisory Summary

CVE-2021-39391 is a MODERATE (CVSS 6.1) cross-site scripting vulnerability (CWE-64: Windows Shortcut Following (.LNK)) affecting Github.com/beego/beego/v2 libraries in the Go ecosystem. The issue involves cross-site scripting in beego. Remediation is available by upgrading affected packages to version 2.0.2.

CVE-2021-39391 at a Glance

CVE Identifier CVE-2021-39391
GHSA Identifier GHSA-c77f-4rgj-jfr4
Severity MODERATE
CVSS v3.1 Base Score 6.1
CWE Classification CWE-64: Windows Shortcut Following (.LNK)
Affected Product Github.com/beego/beego/v2
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 6.1

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:C/C:L/I:L/A:N).

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

How to Fix CVE-2021-39391

To remediate this vulnerability, upgrade all affected Github.com/beego/beego/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/beego/beego/v2 fixed: 2.0.2 
Upgrade github.com/beego/beego/v2 to 2.0.2
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/beego/beego/v2

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-39391, inspect your project dependencies for Github.com/beego/beego/v2:

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

Analyze the terminal output to locate any version of Github.com/beego/beego/v2 in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.0.2), 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-64: Windows Shortcut Following (.LNK), where the product, when opening a file or directory, does not sufficiently handle when the file is a windows shortcut (.lnk) whose target is outside of the intended control sphere. this could allow an attacker to cause the product to operate on unauthorized files. In Github.com/beego/beego/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

Cross Site Scripting (XSS) vulnerability exists in the admin panel in Beego v2.0.1 via the URI path in an HTTP request, which is activated by administrators viewing the "Request Statistics" page.

CVE-2021-39391 Affected Github.com/beego/beego/v2 Versions

1 component(s)
Fixed Versions:
2.0.2
Product / Package Ecosystem Affected Versions Fixed Version
github.com/beego/beego/v2
golang/github.com/beego/beego/v2
Go
< 2.0.2
2.0.2

References

NVD — CVE-2021-39391 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-39391
Github.com/beego/beego/v2 Source Repository REPOSITORY
https://github.com/beego/beego/issues/4727
Github.com/beego/beego/v2 Source Repository REPOSITORY
https://github.com/beego/beego

Frequently Asked Questions

What is CVE-2021-39391?
CVE-2021-39391 is a security vulnerability in Github.com/beego/beego/v2 involving Cross-site Scripting in Beego under CWE-64: Windows Shortcut Following (.LNK).
Which Github.com/beego/beego/v2 versions are affected?
Affected versions include releases prior to 2.0.2 across affected packages: github.com/beego/beego/v2.
What version fixes CVE-2021-39391?
Upgrading to 2.0.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/beego/beego/v2 affected?
Yes, github.com/beego/beego/v2 is affected in releases prior to 2.0.2. Upgrade your dependency to 2.0.2 or later.
What is the CVSS score of CVE-2021-39391?
CVE-2021-39391 has a CVSS v3.1 base score of 6.1 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
What CWE is associated with CVE-2021-39391?
CVE-2021-39391 is classified under CWE-64: Windows Shortcut Following (.LNK) (The product, when opening a file or directory, does not sufficiently handle when the file is a Windows shortcut (.LNK) whose target is outside of the intended control sphere. This could allow an attacker to cause the product to operate on unauthorized files.).
How can I check Go dependencies for CVE-2021-39391?
Run the dependency tree command: 'inspect dependencies for github.com/beego/beego/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-c77f-4rgj-jfr4",
  "modified" : "2023-12-07T23:44:35Z",
  "published" : "2021-09-15T20:23:28Z",
  "aliases" : [ "CVE-2021-39391" ],
  "summary" : "Cross-site Scripting in Beego",
  "details" : "Cross Site Scripting (XSS) vulnerability exists in the admin panel in Beego v2.0.1 via the URI path in an HTTP request, which is activated by administrators viewing the \"Request Statistics\" page.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/beego/beego/v2"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.0.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-39391"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/beego/beego/issues/4727"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/beego/beego"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-64", "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-09-15T18:12:59Z",
    "nvd_published_at" : "2021-09-14T18:15:00Z"
  }
}