CVE-2021-32546: Gogs.io/gogs OS Command Injection Vulnerability

CRITICAL
Advisory Identifier: GHSA-56j7-2pm8-rgmx
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CWE-78
Published
Advisory Summary

CVE-2021-32546 is a CRITICAL os command injection vulnerability (CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')) affecting Gogs.io/gogs libraries in the Go ecosystem. The issue involves os command injection in gogs. Remediation is available by upgrading affected packages to version 0.12.8.

CVE-2021-32546 at a Glance

CVE Identifier CVE-2021-32546
GHSA Identifier GHSA-56j7-2pm8-rgmx
Severity CRITICAL
CVSS v3.1 Base Score N/A
CWE Classification CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Affected Product Gogs.io/gogs
Package Ecosystem Go
Published Date
Last Updated

How to Fix CVE-2021-32546

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

gogs.io/gogs fixed: 0.12.8 
Upgrade gogs.io/gogs to 0.12.8
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 gogs.io/gogs

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-32546, inspect your project dependencies for Gogs.io/gogs:

inspect dependencies for gogs.io/gogs

Analyze the terminal output to locate any version of Gogs.io/gogs in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.12.8), 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-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'), where the product constructs all or part of an os command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended os command when it is sent to a downstream component. In Gogs.io/gogs, 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

### Impact The malicious user is able to update a crafted `config` file into repository's `.git` directory with to gain SSH access to the server. All installations with [repository upload enabled (default)](https://github.com/gogs/gogs/blob/f36eeedbf89328ee70cc3a2e239f6314f9021f58/conf/app.ini#L127-L129) are affected. ### Patches Repository file updates are prohibited to its `.git` directory. Users should upgrade to 0.12.8 or the latest 0.13.0+dev. ### Workarounds N/A ### References N/A ### For more information If you have any questions or comments about this advisory, please post on #6555.

CVE-2021-32546 Affected Gogs.io/gogs Versions

1 component(s)
Fixed Versions:
0.12.8
Product / Package Ecosystem Affected Versions Fixed Version
gogs.io/gogs
golang/gogs.io/gogs
Go
< 0.12.8
0.12.8

References

GitHub Advisory / Wiki ADVISORY
https://github.com/gogs/gogs/security/advisories/GHSA-56j7-2pm8-rgmx
NVD — CVE-2021-32546 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-32546
Gogs.io/gogs Source Repository REPOSITORY
https://github.com/gogs/gogs/issues/6555
Gogs.io/gogs Source Repository REPOSITORY
https://github.com/gogs/gogs/pull/6986
Gogs.io/gogs Source Repository REPOSITORY
https://github.com/gogs/gogs
Gogs.io/gogs Source Repository REPOSITORY
https://github.com/gogs/gogs/blob/f36eeedbf89328ee70cc3a2e239f6314f9021f58/conf/app.ini#L127-L129
Gogs.io/gogs Source Repository REPOSITORY
https://github.com/gogs/gogs/releases
Gogs.io/gogs Release RELEASE
https://github.com/gogs/gogs/releases/tag/v0.12.8

Frequently Asked Questions

What is CVE-2021-32546?
CVE-2021-32546 is a security vulnerability in Gogs.io/gogs involving OS Command Injection in gogs under CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection').
Which Gogs.io/gogs versions are affected?
Affected versions include releases prior to 0.12.8 across affected packages: gogs.io/gogs.
What version fixes CVE-2021-32546?
Upgrading to 0.12.8 (or the latest patched release for your respective branch) resolves the vulnerability.
Is gogs.io/gogs affected?
Yes, gogs.io/gogs is affected in releases prior to 0.12.8. Upgrade your dependency to 0.12.8 or later.
What CWE is associated with CVE-2021-32546?
CVE-2021-32546 is classified under CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') (The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.).
How can I check Go dependencies for CVE-2021-32546?
Run the dependency tree command: 'inspect dependencies for gogs.io/gogs'. 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-56j7-2pm8-rgmx",
  "modified" : "2022-06-02T20:52:23Z",
  "published" : "2022-06-02T20:52:23Z",
  "aliases" : [ "CVE-2021-32546" ],
  "summary" : "OS Command Injection in gogs",
  "details" : "### Impact\n\nThe malicious user is able to update a crafted `config` file into repository's `.git` directory with to gain SSH access to the server. All installations with [repository upload enabled (default)](https://github.com/gogs/gogs/blob/f36eeedbf89328ee70cc3a2e239f6314f9021f58/conf/app.ini#L127-L129) are affected.\n\n### Patches\n\nRepository file updates are prohibited to its `.git` directory. Users should upgrade to 0.12.8 or the latest 0.13.0+dev.\n\n### Workarounds\n\nN/A\n\n### References\n\nN/A\n\n### For more information\n\nIf you have any questions or comments about this advisory, please post on #6555.\n",
  "severity" : [ ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "gogs.io/gogs"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.12.8"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/gogs/gogs/security/advisories/GHSA-56j7-2pm8-rgmx"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-32546"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/gogs/gogs/issues/6555"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/gogs/gogs/pull/6986"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/gogs/gogs"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/gogs/gogs/blob/f36eeedbf89328ee70cc3a2e239f6314f9021f58/conf/app.ini#L127-L129"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/gogs/gogs/releases"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/gogs/gogs/releases/tag/v0.12.8"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-78" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-06-02T20:52:23Z",
    "nvd_published_at" : "2022-06-02T14:15:00Z"
  }
}