CVE-2021-45331: Code.gitea.io/gitea Reuse Of One Time Passwords Vulnerability

CRITICAL
Advisory Identifier: GHSA-hfmf-q69j-6m5p
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CVSS 9.8
CWE-287
Published
Advisory Summary

CVE-2021-45331 is a CRITICAL (CVSS 9.8) reuse of one time passwords vulnerability (CWE-287: Improper Authentication) affecting Code.gitea.io/gitea libraries in the Go ecosystem. The issue involves reuse of one time passwords allowed in gitea. Remediation is available by upgrading affected packages to version 1.5.0.

CVE-2021-45331 at a Glance

CVE Identifier CVE-2021-45331
GHSA Identifier GHSA-hfmf-q69j-6m5p
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-287: Improper Authentication
Affected Product Code.gitea.io/gitea
Package Ecosystem Go
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-2021-45331

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

code.gitea.io/gitea fixed: 1.5.0 
Upgrade code.gitea.io/gitea to 1.5.0
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 code.gitea.io/gitea

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-45331, inspect your project dependencies for Code.gitea.io/gitea:

inspect dependencies for code.gitea.io/gitea

Analyze the terminal output to locate any version of Code.gitea.io/gitea in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.5.0), 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-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 Code.gitea.io/gitea, 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

An Authentication Bypass vulnerability exists in Gitea before 1.5.0, which could let a malicious user gain privileges. If captured, the TOTP code for the 2FA can be submitted correctly more than once.

CVE-2021-45331 Affected Code.gitea.io/gitea Versions

1 component(s)
Fixed Versions:
1.5.0
Product / Package Ecosystem Affected Versions Fixed Version
code.gitea.io/gitea
golang/code.gitea.io/gitea
Go
< 1.5.0
1.5.0

References

NVD — CVE-2021-45331 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-45331
Code.gitea.io/gitea Source Repository REPOSITORY
https://github.com/go-gitea/gitea/pull/3878
blog.gitea.io/2018/08/gitea-1.5.0... WEB
https://blog.gitea.io/2018/08/gitea-1.5.0-is-released

Frequently Asked Questions

What is CVE-2021-45331?
CVE-2021-45331 is a security vulnerability in Code.gitea.io/gitea involving Reuse of one time passwords allowed in Gitea under CWE-287: Improper Authentication.
Which Code.gitea.io/gitea versions are affected?
Affected versions include releases prior to 1.5.0 across affected packages: code.gitea.io/gitea.
What version fixes CVE-2021-45331?
Upgrading to 1.5.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is code.gitea.io/gitea affected?
Yes, code.gitea.io/gitea is affected in releases prior to 1.5.0. Upgrade your dependency to 1.5.0 or later.
What is the CVSS score of CVE-2021-45331?
CVE-2021-45331 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-2021-45331?
CVE-2021-45331 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 Go dependencies for CVE-2021-45331?
Run the dependency tree command: 'inspect dependencies for code.gitea.io/gitea'. 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-hfmf-q69j-6m5p",
  "modified" : "2023-09-15T20:18:29Z",
  "published" : "2022-02-10T00:00:22Z",
  "aliases" : [ "CVE-2021-45331" ],
  "summary" : "Reuse of one time passwords allowed in Gitea",
  "details" : "An Authentication Bypass vulnerability exists in Gitea before 1.5.0, which could let a malicious user gain privileges. If captured, the TOTP code for the 2FA can be submitted correctly more than once.",
  "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" : "Go",
      "name" : "code.gitea.io/gitea"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.5.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-45331"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/go-gitea/gitea/pull/3878"
  }, {
    "type" : "WEB",
    "url" : "https://blog.gitea.io/2018/08/gitea-1.5.0-is-released"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-287" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-09-08T00:01:19Z",
    "nvd_published_at" : "2022-02-09T18:15:00Z"
  }
}