CVE-2021-33496: Github.com/dutchcoders/transfer.sh Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-w3jx-wv97-67ph
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CVSS 6.1
CWE-79
Published
Advisory Summary

CVE-2021-33496 is a MODERATE (CVSS 6.1) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Github.com/dutchcoders/transfer.sh libraries in the Go ecosystem. The issue involves cross-site scripting in dutchcoders transfer.sh. Remediation is available by upgrading affected packages to version 1.2.4.

CVE-2021-33496 at a Glance

CVE Identifier CVE-2021-33496
GHSA Identifier GHSA-w3jx-wv97-67ph
Severity MODERATE
CVSS v3.1 Base Score 6.1
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product Github.com/dutchcoders/transfer.sh
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-2021-33496

To remediate this vulnerability, upgrade all affected Github.com/dutchcoders/transfer.sh 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/dutchcoders/transfer.sh fixed: 1.2.4 
Upgrade github.com/dutchcoders/transfer.sh to 1.2.4
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/dutchcoders/transfer.sh

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-33496, inspect your project dependencies for Github.com/dutchcoders/transfer.sh:

inspect dependencies for github.com/dutchcoders/transfer.sh

Analyze the terminal output to locate any version of Github.com/dutchcoders/transfer.sh in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.2.4), 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-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'), where the product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. In Github.com/dutchcoders/transfer.sh, 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

Dutchcoders transfer.sh before 1.2.4 allows XSS via an inline view.

CVE-2021-33496 Affected Github.com/dutchcoders/transfer.sh Versions

1 component(s)
Fixed Versions:
1.2.4
Product / Package Ecosystem Affected Versions Fixed Version
github.com/dutchcoders/transfer.sh
golang/github.com/dutchcoders/transfer.sh
Go
< 1.2.4
1.2.4

References

NVD — CVE-2021-33496 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-33496
Github.com/dutchcoders/transfer.sh Source Repository REPOSITORY
https://github.com/dutchcoders/transfer.sh/pull/373
Security Fix Commit FIX COMMIT
https://github.com/dutchcoders/transfer.sh/commit/9df18fdc69de2e71f30d8c1e6bfab2fda2e52eb4
Github.com/dutchcoders/transfer.sh Release RELEASE
https://github.com/dutchcoders/transfer.sh/releases/tag/v1.2.4
vuln.ryotak.me/advisories/43 WEB
https://vuln.ryotak.me/advisories/43

Frequently Asked Questions

What is CVE-2021-33496?
CVE-2021-33496 is a security vulnerability in Github.com/dutchcoders/transfer.sh involving Cross-site scripting in Dutchcoders transfer.sh under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Github.com/dutchcoders/transfer.sh versions are affected?
Affected versions include releases prior to 1.2.4 across affected packages: github.com/dutchcoders/transfer.sh.
What version fixes CVE-2021-33496?
Upgrading to 1.2.4 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/dutchcoders/transfer.sh affected?
Yes, github.com/dutchcoders/transfer.sh is affected in releases prior to 1.2.4. Upgrade your dependency to 1.2.4 or later.
What is the CVSS score of CVE-2021-33496?
CVE-2021-33496 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-2021-33496?
CVE-2021-33496 is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.).
How can I check Go dependencies for CVE-2021-33496?
Run the dependency tree command: 'inspect dependencies for github.com/dutchcoders/transfer.sh'. 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-w3jx-wv97-67ph",
  "modified" : "2021-05-28T18:03:43Z",
  "published" : "2021-06-29T21:25:27Z",
  "aliases" : [ "CVE-2021-33496" ],
  "summary" : "Cross-site scripting in Dutchcoders transfer.sh",
  "details" : "Dutchcoders transfer.sh before 1.2.4 allows XSS via an inline view.",
  "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/dutchcoders/transfer.sh"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.2.4"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-33496"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/dutchcoders/transfer.sh/pull/373"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/dutchcoders/transfer.sh/commit/9df18fdc69de2e71f30d8c1e6bfab2fda2e52eb4"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/dutchcoders/transfer.sh/releases/tag/v1.2.4"
  }, {
    "type" : "WEB",
    "url" : "https://vuln.ryotak.me/advisories/43"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-05-28T18:03:43Z",
    "nvd_published_at" : "2021-05-24T05:15:00Z"
  }
}