Vulnerability · Published May 3, 2024 · Assigned by GitHub_M
CVE-2024-34075kurwov vulnerable to Denial of Service due to improper data sanitization
Medium 6.2
In plain English
A medium-severity unsafe deserialization in kurwov from xiboon. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
kurwov is a fast, dependency-free library for creating Markov Chains. 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. If a string contains a forbidden substring (i.e. `__proto__`) followed by a space character, the code 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). Any dataset can be contaminated with the substring making it unable to properly generate anything in some cases. This issue has been addressed in version 3.2.5 and all users are advised to upgrade. There are no known workarounds for this vulnerability.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | kurwov | 3.2.5 | GHSA-hfrv-h3q8-9jpr |
Affected products (as reported)
Weakness: CWE-502 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- https://github.com/xiboon/kurwov/security/advisories/GHSA-hfrv-h3q8-9jpr x_refsource_CONFIRM
- https://github.com/xiboon/kurwov/commit/85d63e652594f121d6656177d7a3c0d823c976c9 x_refsource_MISC
- https://github.com/xiboon/kurwov/blob/0d58dfa42135ab40e830e92622857282f980ca89/src/MarkovData.ts#L38-L44 x_refsource_MISC