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Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') in lodash.merge

Cxbf5cb5f8-f150

  • lodash.merge
  • org.webjars.npm:lodash.merge
High
9.8/10

Summary

The package `lodash.merge` versions prior to 4.6.2 are vulnerable to Prototype Pollution. The function `merge` may allow a malicious user to modify the prototype of `Object` via `{constructor: {prototype: {...}}}` causing the addition or modification of an existing property that will exist on all objects.

  • LOW
  • NETWORK
  • HIGH
  • UNCHANGED
  • NONE
  • NONE
  • HIGH
  • HIGH

CWE-1321 - Prototype Pollution

Prototype pollution is one of the lesser-known vulnerabilities. It allows attackers to abuse the rules of JavaScript by injecting properties into the general object “Object” in JS. Modifying the prototype of “Object” affects the behavior of all objects in the entire app, potentially resulting in denial of service, arbitrary code execution, cross-site scripting, etc.

References

Advisory Timeline

  • Published