CVE-2021-45327: Github.com/go gitea/gitea Capture-replay Vulnerability

CRITICAL
Advisory Identifier: GHSA-jrpg-35hw-m4p9
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CVSS 9.8
CWE-294
Published
Advisory Summary

CVE-2021-45327 is a CRITICAL (CVSS 9.8) capture-replay vulnerability (CWE-294: Authentication Bypass by Capture-replay) affecting Github.com/go gitea/gitea libraries in the Go ecosystem. The issue involves capture-replay in gitea. Remediation is available by upgrading affected packages to version 1.11.2.

CVE-2021-45327 at a Glance

CVE Identifier CVE-2021-45327
GHSA Identifier GHSA-jrpg-35hw-m4p9
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-294: Authentication Bypass by Capture-replay
Affected Product Github.com/go gitea/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-2021-45327

To remediate this vulnerability, upgrade all affected Github.com/go gitea/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.

github.com/go-gitea/gitea fixed: 1.11.2 
Upgrade github.com/go-gitea/gitea to 1.11.2
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/go-gitea/gitea

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-45327, inspect your project dependencies for Github.com/go gitea/gitea:

inspect dependencies for github.com/go-gitea/gitea

Analyze the terminal output to locate any version of Github.com/go gitea/gitea in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.11.2), 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-294: Authentication Bypass by Capture-replay, where a capture-replay flaw exists when the design of the product makes it possible for a malicious user to sniff network traffic and bypass authentication by replaying it to the server in question to the same effect as the original message (or with minor changes). In Github.com/go gitea/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

Gitea is a project to help users set up a self-hosted Git service. Gitea before 1.11.2 is affected by Trusting HTTP Permission Methods on the Server Side when referencing the vulnerable admin or user API. This could allow a remote malicious user to execute arbitrary code.

CVE-2021-45327 Affected Github.com/go gitea/gitea Versions

1 component(s)
Fixed Versions:
1.11.2
Product / Package Ecosystem Affected Versions Fixed Version
github.com/go-gitea/gitea
golang/github.com/go-gitea/gitea
Go
< 1.11.2
1.11.2

References

NVD — CVE-2021-45327 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-45327
Github.com/go gitea/gitea Source Repository REPOSITORY
https://github.com/go-gitea/gitea/pull/10462
Github.com/go gitea/gitea Source Repository REPOSITORY
https://github.com/go-gitea/gitea/pull/10465
Github.com/go gitea/gitea Source Repository REPOSITORY
https://github.com/go-gitea/gitea/pull/10582
Security Fix Commit FIX COMMIT
https://github.com/go-gitea/gitea/commit/4cb18601ff33dda5edb47d5b452cc8f2dc39dd67
Security Fix Commit FIX COMMIT
https://github.com/go-gitea/gitea/commit/6f5656ab0ebec03fe63898208dabc802c4be46ab
Security Fix Commit FIX COMMIT
https://github.com/go-gitea/gitea/commit/ed664a9e1dae4d4660e60c981173bbc5102e69ea
blog.gitea.io/2020/03/gitea-1.11.... WEB
https://blog.gitea.io/2020/03/gitea-1.11.2-is-released
Github.com/go gitea/gitea Source Repository REPOSITORY
https://github.com/go-gitea/gitea

Frequently Asked Questions

What is CVE-2021-45327?
CVE-2021-45327 is a security vulnerability in Github.com/go gitea/gitea involving Capture-replay in Gitea under CWE-294: Authentication Bypass by Capture-replay.
Which Github.com/go gitea/gitea versions are affected?
Affected versions include releases prior to 1.11.2 across affected packages: github.com/go-gitea/gitea.
What version fixes CVE-2021-45327?
Upgrading to 1.11.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/go-gitea/gitea affected?
Yes, github.com/go-gitea/gitea is affected in releases prior to 1.11.2. Upgrade your dependency to 1.11.2 or later.
What is the CVSS score of CVE-2021-45327?
CVE-2021-45327 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-2021-45327?
CVE-2021-45327 is classified under CWE-294: Authentication Bypass by Capture-replay (A capture-replay flaw exists when the design of the product makes it possible for a malicious user to sniff network traffic and bypass authentication by replaying it to the server in question to the same effect as the original message (or with minor changes).).
How can I check Go dependencies for CVE-2021-45327?
Run the dependency tree command: 'inspect dependencies for github.com/go-gitea/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-jrpg-35hw-m4p9",
  "modified" : "2022-02-14T23:01:26Z",
  "published" : "2022-02-09T00:00:29Z",
  "aliases" : [ "CVE-2021-45327" ],
  "summary" : "Capture-replay in Gitea",
  "details" : "Gitea is a project to help users set up a self-hosted Git service. Gitea before 1.11.2 is affected by Trusting HTTP Permission Methods on the Server Side when referencing the vulnerable admin or user API. This could allow a remote malicious user to execute arbitrary code.",
  "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" : "github.com/go-gitea/gitea"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.11.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-45327"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/go-gitea/gitea/pull/10462"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/go-gitea/gitea/pull/10465"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/go-gitea/gitea/pull/10582"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/go-gitea/gitea/commit/4cb18601ff33dda5edb47d5b452cc8f2dc39dd67"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/go-gitea/gitea/commit/6f5656ab0ebec03fe63898208dabc802c4be46ab"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/go-gitea/gitea/commit/ed664a9e1dae4d4660e60c981173bbc5102e69ea"
  }, {
    "type" : "WEB",
    "url" : "https://blog.gitea.io/2020/03/gitea-1.11.2-is-released"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/go-gitea/gitea"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-294" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-02-14T23:01:26Z",
    "nvd_published_at" : "2022-02-08T15:15:00Z"
  }
}