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Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') in handlebars

Cxb5ff3426-7838

  • handlebars
  • org.webjars.npm:handlebars
High
8/10

Summary

Versions of handlebars prior to 3.0.8 or 4.5.3 are vulnerable to prototype pollution. It is possible to add or modify properties to the Object prototype through a malicious template. This may allow attackers to crash the application or execute Arbitrary Code in specific conditions.

  • LOW
  • LOCAL
  • HIGH
  • UNCHANGED
  • NONE
  • NONE
  • HIGH
  • LOW

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