CVE-2024-34075: Kurwov Denial of Service Vulnerability

MODERATE
Advisory Identifier: GHSA-hfrv-h3q8-9jpr
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CVSS 6.2
CWE-502
Published
Advisory Summary

CVE-2024-34075 is a MODERATE (CVSS 6.2) denial of service vulnerability (CWE-502: Deserialization of Untrusted Data) affecting Kurwov libraries in the npm ecosystem. The issue involves kurwov vulnerable to denial of service due to improper data sanitization. Remediation is available by upgrading affected packages to version 3.2.5.

CVE-2024-34075 at a Glance

CVE Identifier CVE-2024-34075
GHSA Identifier GHSA-hfrv-h3q8-9jpr
Severity MODERATE
CVSS v3.1 Base Score 6.2
CWE Classification CWE-502: Deserialization of Untrusted Data
Affected Product Kurwov
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 6.2

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

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

How to Fix CVE-2024-34075

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

kurwov fixed: 3.2.5 
npm install kurwov@3.2.5
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 kurwov

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2024-34075, inspect your project dependencies using npm:

npm ls kurwov

Analyze the terminal output to locate any version of Kurwov in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.2.5), your application is affected.

Note: The npm ls kurwov 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-502: Deserialization of Untrusted Data, where the product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid. In Kurwov, 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

### Summary An unsafe sanitization of dataset contents on the `MarkovData#getNext` method used in `Markov#generate` and `Markov#choose` allows a maliciously crafted string on the dataset to throw and stop the function from running properly. ### Details https://github.com/xiboon/kurwov/blob/0d58dfa42135ab40e830e92622857282f980ca89/src/MarkovData.ts#L38-L44 If a string contains a forbidden substring (i.e. `__proto__`) followed by a space character, the second line will access a special property in `MarkovData#finalData` by removing the last character of the string, bypassing the dataset sanitization (as it is supposed to be already sanitized before this function is called). `data` is then defined as the special function found in its prototype instead of an array. On the last line, `data` is then indexed by a random number, which is supposed to return a string but returns undefined as it's a function. Calling `endsWith` then throws. ### PoC https://runkit.com/embed/m6uu40r5ja9b ### Impact Any dataset can be contaminated with the substring making it unable to properly generate anything in some cases.

CVE-2024-34075 Affected Kurwov Versions

1 component(s)
Fixed Versions:
3.2.5
Product / Package Ecosystem Affected Versions Fixed Version
kurwov
npm/kurwov
npm
≥ 3.1.0
< 3.2.5
3.2.5

References

GitHub Advisory / Wiki ADVISORY
https://github.com/xiboon/kurwov/security/advisories/GHSA-hfrv-h3q8-9jpr
NVD — CVE-2024-34075 NVD
https://nvd.nist.gov/vuln/detail/CVE-2024-34075
Security Fix Commit FIX COMMIT
https://github.com/xiboon/kurwov/commit/85d63e652594f121d6656177d7a3c0d823c976c9
Kurwov Source Repository REPOSITORY
https://github.com/xiboon/kurwov
Kurwov Source Repository REPOSITORY
https://github.com/xiboon/kurwov/blob/0d58dfa42135ab40e830e92622857282f980ca89/src/MarkovData.ts#L38-L44

Frequently Asked Questions

What is CVE-2024-34075?
CVE-2024-34075 is a security vulnerability in Kurwov involving kurwov vulnerable to Denial of Service due to improper data sanitization under CWE-502: Deserialization of Untrusted Data.
Which Kurwov versions are affected?
Affected versions include releases prior to 3.2.5 across affected packages: kurwov.
What version fixes CVE-2024-34075?
Upgrading to 3.2.5 (or the latest patched release for your respective branch) resolves the vulnerability.
Is kurwov affected?
Yes, kurwov is affected in releases prior to 3.2.5. Upgrade your dependency to 3.2.5 or later.
What is the CVSS score of CVE-2024-34075?
CVE-2024-34075 has a CVSS v3.1 base score of 6.2 (MODERATE) with vector string CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2024-34075?
CVE-2024-34075 is classified under CWE-502: Deserialization of Untrusted Data (The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.).
How can I check npm dependencies for CVE-2024-34075?
Run the dependency tree command: 'npm ls kurwov'. 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-hfrv-h3q8-9jpr",
  "modified" : "2024-05-03T20:30:38Z",
  "published" : "2024-05-03T20:30:38Z",
  "aliases" : [ "CVE-2024-34075" ],
  "summary" : "kurwov vulnerable to Denial of Service due to improper data sanitization",
  "details" : "### Summary\nAn unsafe sanitization of dataset contents on the `MarkovData#getNext` method used in `Markov#generate` and `Markov#choose` allows a maliciously crafted string on the dataset to throw and stop the function from running properly.\n\n### Details\nhttps://github.com/xiboon/kurwov/blob/0d58dfa42135ab40e830e92622857282f980ca89/src/MarkovData.ts#L38-L44\n\nIf a string contains a forbidden substring (i.e. `__proto__`) followed by a space character, the second line will access a special property in `MarkovData#finalData` by removing the last character of the string, bypassing the dataset sanitization (as it is supposed to be already sanitized before this function is called).\n\n`data` is then defined as the special function found in its prototype instead of an array.\n\nOn the last line, `data` is then indexed by a random number, which is supposed to return a string but returns undefined as it's a function. Calling `endsWith` then throws.\n\n### PoC\nhttps://runkit.com/embed/m6uu40r5ja9b\n\n### Impact\nAny dataset can be contaminated with the substring making it unable to properly generate anything in some cases.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "kurwov"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "3.1.0"
      }, {
        "fixed" : "3.2.5"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/xiboon/kurwov/security/advisories/GHSA-hfrv-h3q8-9jpr"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2024-34075"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/xiboon/kurwov/commit/85d63e652594f121d6656177d7a3c0d823c976c9"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/xiboon/kurwov"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/xiboon/kurwov/blob/0d58dfa42135ab40e830e92622857282f980ca89/src/MarkovData.ts#L38-L44"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-502" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-05-03T20:30:38Z",
    "nvd_published_at" : "2024-05-03T18:15:09Z"
  }
}