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CWE-208: Information Exposure Through Timing Discrepancy

 
Information Exposure Through Timing Discrepancy
Weakness ID: 208 (Weakness Base)Status: Incomplete
+ Description

Description Summary

Two separate operations in a product require different amounts of time to complete, in a way that is observable to an actor and reveals security-relevant information about the state of the product, such as whether a particular operation was successful or not.
+ Time of Introduction
  • Architecture and Design
  • Implementation
  • Operation
+ Applicable Platforms

Languages

All

+ Common Consequences
ScopeEffect
Confidentiality
Access Control

Technical Impact: Read application data; Bypass protection mechanism

+ Observed Examples
ReferenceDescription
CVE-2003-0078 SSL implementation does not perform a MAC computation if an incorrect block cipher padding is used, which causes an information leak (timing discrepancy) that may make it easier to launch cryptographic attacks that rely on distinguishing between padding and MAC verification errors, possibly leading to extraction of the original plaintext, aka the "Vaudenay timing attack."
CVE-2000-1117 Virtual machine allows malicious web site operators to determine the existence of files on the client by measuring delays in the execution of the getSystemResource method.
CVE-2003-0637 Product uses a shorter timeout for a non-existent user than a valid user, which makes it easier for remote attackers to guess usernames and conduct brute force password guessing.
CVE-2003-0190 Product immediately sends an error message when a user does not exist, which allows remote attackers to determine valid usernames via a timing attack.
CVE-2004-1602 FTP server responds in a different amount of time when a given username exists, which allows remote attackers to identify valid usernames by timing the server response.
CVE-2005-0918 Browser allows remote attackers to determine the existence of arbitrary files by setting the src property to the target filename and using Javascript to determine if the web page immediately stops loading, which indicates whether the file exists or not.
+ Other Notes

Attack: Timing attack

+ Relationships
NatureTypeIDNameView(s) this relationship pertains toView(s)
ChildOfWeakness ClassWeakness Class203Information Exposure Through Discrepancy
Development Concepts (primary)699
Research Concepts (primary)1000
ChildOfCategoryCategory895SFP Cluster: Information Leak
Software Fault Pattern (SFP) Clusters (primary)888
CanPrecedeWeakness BaseWeakness Base327Use of a Broken or Risky Cryptographic Algorithm
Research Concepts1000
+ Relationship Notes

Often primary in cryptographic applications and algorithms.

+ Functional Areas
  • Cryptography, authentication
+ Taxonomy Mappings
Mapped Taxonomy NameNode IDFitMapped Node Name
PLOVERTiming discrepancy infoleak
+ Content History
Submissions
Submission DateSubmitterOrganizationSource
PLOVERExternally Mined
Modifications
Modification DateModifierOrganizationSource
2008-07-01Eric DalciCigitalExternal
updated Time_of_Introduction
2008-09-08CWE Content TeamMITREInternal
updated Relationships, Other_Notes, Relationship_Notes, Taxonomy_Mappings
2008-10-14CWE Content TeamMITREInternal
updated Description
2010-09-27CWE Content TeamMITREInternal
updated Relationships
2011-03-29CWE Content TeamMITREInternal
updated Name
2011-06-01CWE Content TeamMITREInternal
updated Common_Consequences
2012-05-11CWE Content TeamMITREInternal
updated Observed_Examples, Relationships
Previous Entry Names
Change DatePrevious Entry Name
2011-03-29Timing Discrepancy Information Leak
Page Last Updated: February 18, 2014