CVE-2020-26284: Github.com/gohugoio/hugo Hugo Can Execute A Binary Vulnerability

HIGH
Advisory Identifier: GHSA-8j34-9876-pvfq
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CVSS 7.7
CWE-78
Published
Advisory Summary

CVE-2020-26284 is a HIGH (CVSS 7.7) hugo can execute a binary vulnerability (CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')) affecting Github.com/gohugoio/hugo libraries in the Go ecosystem. The issue involves hugo can execute a binary from the current directory on windows. Remediation is available by upgrading affected packages to version 0.79.1.

CVE-2020-26284 at a Glance

CVE Identifier CVE-2020-26284
GHSA Identifier GHSA-8j34-9876-pvfq
Severity HIGH
CVSS v3.1 Base Score 7.7
CWE Classification CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Affected Product Github.com/gohugoio/hugo
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 7.7

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N).

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

How to Fix CVE-2020-26284

To remediate this vulnerability, upgrade all affected Github.com/gohugoio/hugo 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/gohugoio/hugo fixed: 0.79.1 
Upgrade github.com/gohugoio/hugo to 0.79.1
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/gohugoio/hugo

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-26284, inspect your project dependencies for Github.com/gohugoio/hugo:

inspect dependencies for github.com/gohugoio/hugo

Analyze the terminal output to locate any version of Github.com/gohugoio/hugo in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.79.1), 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 Github.com/gohugoio/hugo, 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 Hugo depends on Go's `os/exec` for certain features, e.g. for rendering of Pandoc documents if these binaries are found in the system `%PATH%` on Windows. However, if a malicious file with the same name (`exe` or `bat`) is found in the current working directory at the time of running `hugo`, the malicious command will be invoked instead of the system one. Windows users who run `hugo` inside untrusted Hugo sites are affected. ## Patches Users should upgrade to Hugo v0.79.1.

CVE-2020-26284 Affected Github.com/gohugoio/hugo Versions

1 component(s)
Fixed Versions:
0.79.1
Product / Package Ecosystem Affected Versions Fixed Version
github.com/gohugoio/hugo
golang/github.com/gohugoio/hugo
Go
< 0.79.1
0.79.1

References

GitHub Advisory / Wiki ADVISORY
https://github.com/gohugoio/hugo/security/advisories/GHSA-8j34-9876-pvfq
NVD — CVE-2020-26284 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-26284
Github.com/gohugoio/hugo Source Repository REPOSITORY
https://github.com/golang/go/issues/38736

Frequently Asked Questions

What is CVE-2020-26284?
CVE-2020-26284 is a security vulnerability in Github.com/gohugoio/hugo involving Hugo can execute a binary from the current directory on Windows under CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection').
Which Github.com/gohugoio/hugo versions are affected?
Affected versions include releases prior to 0.79.1 across affected packages: github.com/gohugoio/hugo.
What version fixes CVE-2020-26284?
Upgrading to 0.79.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/gohugoio/hugo affected?
Yes, github.com/gohugoio/hugo is affected in releases prior to 0.79.1. Upgrade your dependency to 0.79.1 or later.
What is the CVSS score of CVE-2020-26284?
CVE-2020-26284 has a CVSS v3.1 base score of 7.7 (HIGH) with vector string CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N.
What CWE is associated with CVE-2020-26284?
CVE-2020-26284 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-2020-26284?
Run the dependency tree command: 'inspect dependencies for github.com/gohugoio/hugo'. 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-8j34-9876-pvfq",
  "modified" : "2021-05-21T18:15:45Z",
  "published" : "2021-06-23T17:28:26Z",
  "aliases" : [ "CVE-2020-26284" ],
  "summary" : "Hugo can execute a binary from the current directory on Windows",
  "details" : "## Impact\n\nHugo depends on Go's `os/exec` for certain features, e.g. for rendering of Pandoc documents if these binaries are found in the system `%PATH%` on Windows. However, if a malicious file with the same name (`exe` or `bat`) is found in the current working directory at the time of running `hugo`, the malicious command will be invoked instead of the system one.\n\nWindows users who run `hugo` inside untrusted Hugo sites are affected.\n\n## Patches\nUsers should upgrade to Hugo v0.79.1.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/gohugoio/hugo"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.79.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/gohugoio/hugo/security/advisories/GHSA-8j34-9876-pvfq"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-26284"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/golang/go/issues/38736"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-78" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-05-21T18:15:45Z",
    "nvd_published_at" : "2020-12-21T23:15:00Z"
  }
}