CVE-2020-28272

描述

### Overview Prototype pollution vulnerability in 'keyget' versions 1.0.0 through 2.2.0 allows attacker to cause a denial of service and may lead to remote code execution. ### Details The npm module 'keyget' can be abused by Prototype Pollution vulnerability since the function 'setByPath()' did not check for the type of object before assigning value to the property. Due to this flaw an attacker could create a non-existent property or able to manipulate the property which leads to Denial of Service or potentially Remote code execution. ### PoC Details The `setByPath()` function accepts three arguments `target, path, value`. Due to the absence of validation, at values passed into `path, value` an attacker can supply a malicious value by adjusting the `path` value to include the `__proto__` property. Since there is no validation before assigning property to check whether the assigned `path` is the Object's own property or not, the property `polluted` will be directly be assigned to the empty obj({}) thereby polluting the Object prototype. Later in the code, if there is a check to validate `polluted` the value would be substituted as "true" as it had been polluted. ### PoC Code ```js var keyget = require("keyget") keyget.set({}, '__proto__.polluted', 'true'); console.log(polluted); ```

如何修補 CVE-2020-28272

要修補 CVE-2020-28272,請將受影響套件升級到下列已修補版本。

• —升級至 2.3.0 或更新版本

CVE-2020-28272 正在被利用嗎?

低 — EPSS 為 3.3%,目前沒有觀察到大規模利用活動。

受影響套件(1)

• >= 1.0.0, < 2.3.0

CVSS 分數