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
var keyget = require("keyget")
keyget.set({}, '__proto__.polluted', 'true');
console.log(polluted); References
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 argumentstarget, path, value. Due to the absence of validation, at values passed intopath, valuean attacker can supply a malicious value by adjusting thepathvalue to include the__proto__property. Since there is no validation before assigning property to check whether the assignedpathis the Object's own property or not, the propertypollutedwill be directly be assigned to the empty obj({}) thereby polluting the Object prototype. Later in the code, if there is a check to validatepollutedthe value would be substituted as "true" as it had been polluted.PoC Code
References