CVE-2022-24725: Shescape Exposure Of Home Directory Through Vulnerability

MODERATE
Advisory Identifier: GHSA-446w-rrm4-r47f
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CVSS 5.5
CWE-78 CWE-200
Published
Advisory Summary

CVE-2022-24725 is a MODERATE (CVSS 5.5) exposure of home directory through vulnerability (CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')) affecting Shescape libraries in the npm ecosystem. The issue involves exposure of home directory through shescape on unix with bash. Remediation is available by upgrading affected packages to version 1.5.1.

CVE-2022-24725 at a Glance

CVE Identifier CVE-2022-24725
GHSA Identifier GHSA-446w-rrm4-r47f
Severity MODERATE
CVSS v3.1 Base Score 5.5
CWE Classification CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Affected Product Shescape
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 5.5

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

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

How to Fix CVE-2022-24725

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

shescape fixed: 1.5.1 
npm install shescape@1.5.1
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

npm ls shescape

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2022-24725, inspect your project dependencies using npm:

npm ls shescape

Analyze the terminal output to locate any version of Shescape in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.5.1), your application is affected.

Note: The npm ls shescape command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

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 Shescape, 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 issue allows for exposure of the home directory on Unix systems when using Bash with the `escape` or `escapeAll` functions from the _shescape_ API with the `interpolation` option set to `true`. Other tested shells, Dash and Zsh, are not affected. ```javascript const cp = require("child_process"); const shescape = require("shescape"); const payload = "home_directory=~"; const options = { interpolation: true }; console.log(cp.execSync(`echo ${shescape.escape(payload, options)}`)); // home_directory=/home/user ``` Depending on how the output of _shescape_ is used, directory traversal may be possible in the application using _shescape_. ### Patches The issue was patched in `v1.5.1`. ### Workarounds Manually escape all instances of the tilde character (`~`) using `arg.replace(/~/g, "\\~")`. ### References See GitHub issue https://github.com/ericcornelissen/shescape/issues/169.

CVE-2022-24725 Affected Shescape Versions

1 component(s)
Fixed Versions:
1.5.1
Product / Package Ecosystem Affected Versions Fixed Version
shescape
npm/shescape
npm
≥ 1.4.0
< 1.5.1
1.5.1

References

GitHub Advisory / Wiki ADVISORY
https://github.com/ericcornelissen/shescape/security/advisories/GHSA-446w-rrm4-r47f
NVD — CVE-2022-24725 NVD
https://nvd.nist.gov/vuln/detail/CVE-2022-24725
Shescape Source Repository REPOSITORY
https://github.com/ericcornelissen/shescape/issues/169
Shescape Source Repository REPOSITORY
https://github.com/ericcornelissen/shescape/pull/170
Shescape Source Repository REPOSITORY
https://github.com/ericcornelissen/shescape

Frequently Asked Questions

What is CVE-2022-24725?
CVE-2022-24725 is a security vulnerability in Shescape involving Exposure of home directory through shescape on Unix with Bash under CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection').
Which Shescape versions are affected?
Affected versions include releases prior to 1.5.1 across affected packages: shescape.
What version fixes CVE-2022-24725?
Upgrading to 1.5.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is shescape affected?
Yes, shescape is affected in releases prior to 1.5.1. Upgrade your dependency to 1.5.1 or later.
What is the CVSS score of CVE-2022-24725?
CVE-2022-24725 has a CVSS v3.1 base score of 5.5 (MODERATE) with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
What CWE is associated with CVE-2022-24725?
CVE-2022-24725 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 npm dependencies for CVE-2022-24725?
Run the dependency tree command: 'npm ls shescape'. 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-446w-rrm4-r47f",
  "modified" : "2022-03-18T20:06:07Z",
  "published" : "2022-03-03T19:26:11Z",
  "aliases" : [ "CVE-2022-24725" ],
  "summary" : "Exposure of home directory through shescape on Unix with Bash",
  "details" : "### Impact\n\nThe issue allows for exposure of the home directory on Unix systems when using Bash with the `escape` or `escapeAll` functions from the _shescape_ API with the `interpolation` option set to `true`. Other tested shells, Dash and Zsh, are not affected.\n\n```javascript\nconst cp = require(\"child_process\");\nconst shescape = require(\"shescape\");\n\nconst payload = \"home_directory=~\";\nconst options = { interpolation: true };\nconsole.log(cp.execSync(`echo ${shescape.escape(payload, options)}`));\n// home_directory=/home/user\n```\n\nDepending on how the output of _shescape_ is used, directory traversal may be possible in the application using _shescape_.\n\n### Patches\n\nThe issue was patched in `v1.5.1`.\n\n### Workarounds\n\nManually escape all instances of the tilde character (`~`) using `arg.replace(/~/g, \"\\\\~\")`.\n\n### References\n\nSee GitHub issue https://github.com/ericcornelissen/shescape/issues/169.\n",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "shescape"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.4.0"
      }, {
        "fixed" : "1.5.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/ericcornelissen/shescape/security/advisories/GHSA-446w-rrm4-r47f"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2022-24725"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/ericcornelissen/shescape/issues/169"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/ericcornelissen/shescape/pull/170"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/ericcornelissen/shescape"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-200", "CWE-78" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-03-03T19:26:11Z",
    "nvd_published_at" : "2022-03-03T22:15:00Z"
  }
}