Small Space of Random Values
Weakness ID: 334 (Weakness Base)Status: Draft
+ Description

Description Summary

The number of possible random values is smaller than needed by the product, making it more susceptible to brute force attacks.
+ Time of Introduction
  • Architecture and Design
  • Implementation
+ Applicable Platforms



+ Observed Examples
CVE-2002-0583Product uses 5 alphanumeric characters for filenames of expense claim reports, stored under web root.
CVE-2002-0903Product uses small number of random numbers for a code to approve an action, and also uses predictable new user IDs, allowing attackers to hijack new accounts.
CVE-2003-1230SYN cookies implementation only uses 32-bit keys, making it easier to brute force ISN.
CVE-2004-0230Complex predictability / randomness (reduced space).
+ Potential Mitigations

Phase: Implementation

Perform FIPS 140-2 tests on data to catch obvious entropy problems.

Phase: Implementation

Consider a PRNG which re-seeds itself, as needed from a high quality pseudo-random output, like hardware devices.

+ Relationships
NatureTypeIDNameView(s) this relationship pertains toView(s)
ChildOfWeakness ClassWeakness Class330Use of Insufficiently Random Values
Development Concepts (primary)699
Research Concepts (primary)1000
ParentOfWeakness VariantWeakness Variant6J2EE Misconfiguration: Insufficient Session-ID Length
Research Concepts (primary)1000
+ Taxonomy Mappings
Mapped Taxonomy NameNode IDFitMapped Node Name
PLOVERSmall Space of Random Values
+ Content History
Submission DateSubmitterOrganizationSource
PLOVERExternally Mined
Modification DateModifierOrganizationSource
2008-07-01Eric DalciCigitalExternal
updated Time of Introduction
2008-09-08CWE Content TeamMITREInternal
updated Relationships, Taxonomy Mappings
2009-03-10CWE Content TeamMITREInternal
updated Potential Mitigations
2009-12-28CWE Content TeamMITREInternal
updated Potential Mitigations