CVE-2023-35931: Shescape Shescape Potential Environment Variable Exposure Vulnerability
LOWCVE-2023-35931 is a LOW (CVSS 3.1) shescape potential environment variable exposure vulnerability (CWE-526: Cleartext Storage of Sensitive Information in an Environment Variable) affecting Shescape libraries in the npm ecosystem. The issue involves shescape potential environment variable exposure on windows with cmd. Remediation is available by upgrading affected packages to version 1.7.1.
CVE-2023-35931 at a Glance
Security Impact
CVSS: 3.1
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:N/S:U/C:L/I:N/A:N).
How to Fix CVE-2023-35931
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.
npm install shescape@1.7.1Run the following command in your project directory to verify that all resolved dependencies use the patched release:
npm ls shescapeHow to Check if You Are Affected
To determine whether your Node.js application is affected by CVE-2023-35931, inspect your project dependencies using npm:
npm ls shescapeAnalyze 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 1.7.1), 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-526: Cleartext Storage of Sensitive Information in an Environment Variable, where the product uses an environment variable to store unencrypted sensitive information. 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
CVE-2023-35931 Affected Shescape Versions
1 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
shescape
|
npm |
< 1.7.1
|
1.7.1
|
References
Frequently Asked Questions
What is CVE-2023-35931?
Which Shescape versions are affected?
What version fixes CVE-2023-35931?
Is shescape affected?
What is the CVSS score of CVE-2023-35931?
What CWE is associated with CVE-2023-35931?
How can I check npm dependencies for CVE-2023-35931?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-3g7p-8qhx-mc8r",
"modified" : "2023-06-26T16:35:03Z",
"published" : "2023-06-22T20:01:39Z",
"aliases" : [ "CVE-2023-35931" ],
"summary" : "Shescape potential environment variable exposure on Windows with CMD",
"details" : "### Impact\n\nThis impact users of Shescape:\n\n1. On Windows using the Windows Command Prompt (i.e. `cmd.exe`), and\n2. Using `quote`/`quoteAll` or `escape`/`escapeAll` with the `interpolation` option set to `true`.\n\nAn attacker may be able to get read-only access to environment variables. Example:\n\n```javascript\nimport * as cp from \"node:child_process\";\nimport * as shescape from \"shescape\";\n\n// 1. Prerequisites\nconst options = {\n shell: \"cmd.exe\",\n // Or\n shell: undefined, // Only if the default shell is CMD\n\n // And\n interpolation: true, // Only applies to `escape` and `escapeAll` usage\n}\n\n// 2. Attack (one of many)\nconst payload = \"%PATH%\";\n\n// 3. Usage\nlet escapedPayload;\n\nescapedPayload = shescape.quote(payload, options);\n// Or\nescapedPayload = shescape.quoteAll([payload], options);\n// Or\nescapedPayload = shescape.escape(payload, options);\n// Or\nescapedPayload = shescape.escapeAll([payload], options);\n\n// And (example)\nconst result = cp.execSync(`echo Hello ${escapedPayload}`, options);\n\n// 4. Impact\nconsole.log(result.toString());\n// Outputs \"Hello\" followed by the contents of the PATH environment variable\n```\n\n### Patches\n\nThis bug has been patched in [v1.7.1](https://github.com/ericcornelissen/shescape/releases/tag/v1.7.1) which you can upgrade to now. No further changes are required.\n\n### Workarounds\n\nAlternatively, users can remove all instances of `%` from user input, either before or after using Shescape.\n\n### References\n\n- Shescape Pull request [#982](https://github.com/ericcornelissen/shescape/pull/982)\n- Shescape commit [`d0fce70`](https://github.com/ericcornelissen/shescape/commit/d0fce70f987ac0d8331f93cb45d47e79436173ac)\n- Shescape Release [v1.7.1](https://github.com/ericcornelissen/shescape/releases/tag/v1.7.1)\n",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "npm",
"name" : "shescape"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "1.7.1"
} ]
} ]
} ],
"references" : [ {
"type" : "WEB",
"url" : "https://github.com/ericcornelissen/shescape/security/advisories/GHSA-3g7p-8qhx-mc8r"
}, {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2023-35931"
}, {
"type" : "WEB",
"url" : "https://github.com/ericcornelissen/shescape/pull/982"
}, {
"type" : "WEB",
"url" : "https://github.com/ericcornelissen/shescape/commit/d0fce70f987ac0d8331f93cb45d47e79436173ac"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/ericcornelissen/shescape"
}, {
"type" : "WEB",
"url" : "https://github.com/ericcornelissen/shescape/releases/tag/v1.7.1"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-526" ],
"severity" : "LOW",
"github_reviewed" : true,
"github_reviewed_at" : "2023-06-22T20:01:39Z",
"nvd_published_at" : "2023-06-23T20:15:09Z"
}
}