CWE-1254
Incorrect Comparison Logic Granularity
Draft
2020-02-24
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2024-11-19
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Notifications pour un CWE
Restez informé de toutes modifications pour un CWE spécifique.
Nom: Incorrect Comparison Logic Granularity
The product's comparison logic is performed over a series of steps rather than across the entire string in one operation. If there is a comparison logic failure on one of these steps, the operation may be vulnerable to a timing attack that can result in the interception of the process for nefarious purposes.
Description du CWE
Comparison logic is used to compare a variety of objects including passwords, Message Authentication Codes (MACs), and responses to verification challenges. When comparison logic is implemented at a finer granularity (e.g., byte-by-byte comparison) and breaks in the case of a comparison failure, an attacker can exploit this implementation to identify when exactly the failure occurred. With multiple attempts, the attacker may be able to guesses the correct password/response to challenge and elevate their privileges.
Informations générales
Modes d'introduction
Architecture and DesignImplementation
Plateformes applicables
Langue
Class: Not Language-Specific (Undetermined)Systèmes d’exploitation
Class: Not OS-Specific (Undetermined)Architectures
Class: Not Architecture-Specific (Undetermined)Technologies
Class: Not Technology-Specific (Undetermined)Conséquences courantes
| Portée | Impact | Probabilité |
|---|---|---|
| Confidentiality Authorization | Bypass Protection Mechanism |
Exemples observés
| Références | Description |
|---|---|
CVE-2019-10482 | Smartphone OS uses comparison functions that are not in constant time, allowing side channels |
CVE-2019-10071 | Java-oriented framework compares HMAC signatures using String.equals() instead of a constant-time algorithm, causing timing discrepancies |
CVE-2014-0984 | Password-checking function in router terminates validation of a password entry when it encounters the first incorrect character, which allows remote attackers to obtain passwords via a brute-force attack that relies on timing differences in responses to incorrect password guesses, aka a timing side-channel attack. |
Mesures d’atténuation potentielles
Phases : ImplementationThe hardware designer should ensure that comparison logic is implemented so as to compare in one operation instead in smaller chunks.
Notes de cartographie des vulnérabilités
Justification : This CWE entry is at the Base level of abstraction, which is a preferred level of abstraction for mapping to the root causes of vulnerabilities.Commentaire : Carefully read both the name and description to ensure that this mapping is an appropriate fit. Do not try to 'force' a mapping to a lower-level Base/Variant simply to comply with this preferred level of abstraction.
Modèles d'attaque associés
| CAPEC-ID | Nom du modèle d'attaque |
|---|---|
| CAPEC-26 | Leveraging Race Conditions The adversary targets a race condition occurring when multiple processes access and manipulate the same resource concurrently, and the outcome of the execution depends on the particular order in which the access takes place. The adversary can leverage a race condition by "running the race", modifying the resource and modifying the normal execution flow. For instance, a race condition can occur while accessing a file: the adversary can trick the system by replacing the original file with their version and cause the system to read the malicious file. |
NotesNotes
CWE 4.16 removed a demonstrative example for a hardware module because it was inaccurate and unable to be adapted. The CWE team is developing an alternative.Références
REF-1079
SCA4n00bz - Timing-based Sidechannel Attacks for Hardware N00bz workshopJoe Fitzpatrick.
https://github.com/securelyfitz/SCA4n00bz
Soumission
| Nom | Organisation | Date | Date de publication | Version |
|---|---|---|---|---|
| Arun Kanuparthi, Hareesh Khattri, Parbati Kumar Manna, Narasimha Kumar V Mangipudi | Intel Corporation | 4.1 |
Modifications
| Nom | Organisation | Date | Commentaire |
|---|---|---|---|
| CWE Content Team | MITRE | updated Relationships | |
| CWE Content Team | MITRE | updated Related_Attack_Patterns | |
| CWE Content Team | MITRE | updated Demonstrative_Examples | |
| CWE Content Team | MITRE | updated Observed_Examples, Relationships | |
| CWE Content Team | MITRE | updated Mapping_Notes | |
| CWE Content Team | MITRE | updated Demonstrative_Examples, Observed_Examples | |
| CWE Content Team | MITRE | updated Demonstrative_Examples, Maintenance_Notes |
