CVE-2021-39157: Detect character encoding Improper Handling Of Exceptional Conditions Vulnerability
HIGHCVE-2021-39157 is a HIGH (CVSS 7.5) improper handling of exceptional conditions vulnerability (CWE-755: Improper Handling of Exceptional Conditions) affecting Detect character encoding libraries in the npm ecosystem. The issue involves improper handling of exceptional conditions in detect-character-encoding. Remediation is available by upgrading affected packages to version 0.7.0.
CVE-2021-39157 at a Glance
Security Impact
CVSS: 7.5
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:N/I:N/A:H).
How to Fix CVE-2021-39157
To remediate this vulnerability, upgrade all affected Detect character encoding 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 detect-character-encoding@0.7.0Run the following command in your project directory to verify that all resolved dependencies use the patched release:
npm ls detect-character-encodingHow to Check if You Are Affected
To determine whether your Node.js application is affected by CVE-2021-39157, inspect your project dependencies using npm:
npm ls detect-character-encodingAnalyze the terminal output to locate any version of Detect character encoding in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.7.0), your application is affected.
Note: The npm ls detect-character-encoding 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-755: Improper Handling of Exceptional Conditions, where the product does not handle or incorrectly handles an exceptional condition. In Detect character encoding, 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-2021-39157 Affected Detect character encoding Versions
1 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
detect-character-encoding
|
npm |
< 0.7.0
|
0.7.0
|
References
Frequently Asked Questions
What is CVE-2021-39157?
Which Detect character encoding versions are affected?
What version fixes CVE-2021-39157?
Is detect-character-encoding affected?
What is the CVSS score of CVE-2021-39157?
What CWE is associated with CVE-2021-39157?
How can I check npm dependencies for CVE-2021-39157?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-jqfh-8hw5-fqjr",
"modified" : "2021-10-21T14:15:03Z",
"published" : "2021-08-25T14:44:48Z",
"aliases" : [ "CVE-2021-39157" ],
"summary" : "Improper Handling of Exceptional Conditions in detect-character-encoding",
"details" : "### Impact\n\nIn detect-character-encoding v0.6.0 and earlier, data matching no charset causes the Node.js process to crash.\n\n### Patches\n\nThe problem has been patched in [detect-character-encoding v0.7.0](https://github.com/sonicdoe/detect-character-encoding/releases/tag/v0.7.0).\n\n### CVSS score\n\n[CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/RL:O/RC:C](https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/RL:O/RC:C)\n\nBase Score: 7.5 (High)\nTemporal Score: 7.2 (High)\n\nSince detect-character-encoding is a library, the scoring is based on the “[reasonable worst-case implementation scenario](https://www.first.org/cvss/v3.1/user-guide#3-7-Scoring-Vulnerabilities-in-Software-Libraries-and-Similar)”, namely, accepting data from untrusted sources over a network and passing it directly to detect-character-encoding. Depending on your specific implementation, the vulnerability’s severity in your program may be different.\n\n### Proof of concept\n\n```js\nconst express = require(\"express\");\nconst bodyParser = require(\"body-parser\");\nconst detectCharacterEncoding = require(\"detect-character-encoding\");\n\nconst app = express();\n\napp.use(bodyParser.raw());\n\napp.post(\"/\", (req, res) => {\n const charsetMatch = detectCharacterEncoding(req.body);\n\n res.end(charsetMatch.encoding);\n});\n\napp.listen(3000);\n```\n\n`printf \"\\xAA\" | curl --request POST --header \"Content-Type: application/octet-stream\" --data-binary @- http://localhost:3000` crashes the server.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "npm",
"name" : "detect-character-encoding"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "0.7.0"
} ]
} ]
} ],
"references" : [ {
"type" : "WEB",
"url" : "https://github.com/sonicdoe/detect-character-encoding/security/advisories/GHSA-jqfh-8hw5-fqjr"
}, {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-39157"
}, {
"type" : "WEB",
"url" : "https://github.com/sonicdoe/detect-character-encoding/issues/15"
}, {
"type" : "WEB",
"url" : "https://github.com/sonicdoe/detect-character-encoding/commit/992a11007fff6cfd40b952150ab8d30410c4a20a"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/sonicdoe/detect-character-encoding"
}, {
"type" : "WEB",
"url" : "https://github.com/sonicdoe/detect-character-encoding/releases/tag/v0.7.0"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-755" ],
"severity" : "HIGH",
"github_reviewed" : true,
"github_reviewed_at" : "2021-08-24T19:11:52Z",
"nvd_published_at" : "2021-08-24T19:15:00Z"
}
}