CVE-2020-7777

描述

This affects all versions of package jsen. If an attacker can control the schema file, it could run arbitrary JavaScript code on the victim machine. In the module description and README file there is no mention about the risks of untrusted schema files, so it is assumed that this is applicable. In particular the required field of the schema is not properly sanitized. The resulting string that is build based on the schema definition is then passed to a `Function.apply();`, leading to an Arbitrary Code Execution. ### PoC ```js const jsen = require('jsen'); let schema = JSON.parse( { "type": "object", "properties": { "username": { "type": "string" } }, "required": ["\\"+process.mainModule.require(\'child_process\').execSync(\'touch malicious\')+\\""] } ); const validate = jsen(schema); validate({}); ```

如何修補 CVE-2020-7777

目前尚未發布修補版本。可考慮移除受影響套件,或參考下方連結中的上游建議。

• —未列出修補版本

CVE-2020-7777 正在被利用嗎?

低 — EPSS 為 1.0%,目前沒有觀察到大規模利用活動。

受影響套件(1)

• from 0, <= 0.6.6

CVSS 分數

參考連結(3)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2020-7777
• WEBgithub.com/bugventure/jsen/blob/master/lib/jsen.js#L875
• WEBsecurity.snyk.io/vuln/SNYK-JS-JSEN-1014670