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CVE-2021-25915

Date: March 9, 2021

Overview

Prototype pollution vulnerability in 'changeset' versions 0.1.0 through 0.2.5 allows attackers to cause a denial of service and may lead to remote code execution.

Details

The NPM module 'changeset' can be abused by Prototype Pollution vulnerability since the function 'apply()' does 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 'apply()' function accepts 'changes, target, modify' as argument. Due to the absence of validation on the values passed into the 'changes' argument, an attacker can supply a malicious value by adjusting the value to include the '__proto__' property. Since there is no validation before assigning the property to check whether the assigned argument is the Object's own property or not, the property 'polluted' will be directly be assigned to the new object thereby polluting the Object prototype. Later in the code, if there is a check to validate 'polluted' the valued would be substituted as "Yes! Its Polluted" as it had been polluted.

PoC Code

var changeset = require("changeset") const patch = [{
    type: 'put',
    key: ["__proto__", "polluted"],
    value: "Yes! Its Polluted"
}];
console.log("Before : " + {}.polluted);
changeset.apply(patch, {}, true);
console.log("After : " + {}.polluted);

Affected Environments

0.1.0--0.2.5

Prevention

Upgrade to version 0.2.6

Language: JS

Good to know:

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Insufficient Information

NVD-CWE-noinfo
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Upgrade Version

Upgrade to version 0.2.6

Learn More

Base Score:
Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High
Base Score:
Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (AU): None
Confidentiality (C): Partial
Integrity (I): Partial
Availability (A): Partial
Additional information: