CWE-269 Classe Brouillon Medium likelihood

Improper Privilege Management

This vulnerability occurs when an application fails to correctly manage user permissions, allowing someone to perform actions or access data beyond their intended authority.

Définition

What is CWE-269?

This vulnerability occurs when an application fails to correctly manage user permissions, allowing someone to perform actions or access data beyond their intended authority.
Improper privilege management is a core security flaw where the system's logic for granting, changing, or verifying user rights is broken. Instead of consistently enforcing a 'least privilege' model, it creates gaps where attackers or even regular users can escalate their access, modify settings, view sensitive information, or delete data they shouldn't touch. This often stems from flawed assumptions, missing checks, or errors in how roles and permissions are tracked throughout a user's session. To prevent this, developers must implement a centralized, deny-by-default authorization layer that validates every request against the user's current, verified privileges. Key strategies include using server-side checks for all actions, avoiding reliance on client-side controls, implementing proper session management, and conducting regular audits of permission assignments. Always explicitly verify 'who can do what' at the point of every action, never assuming the user interface or a previous check is sufficient.
Vulnerability Diagram CWE-269
Improper Privilege Management init setuid(root) bind :443 should drop setuid(www) ✗ forgotten handle requests still root → exploit = full system Privileges granted for setup are kept far longer than needed.
Impact réel

Real-world CVEs caused by CWE-269

  • CVE-2001-1555

    Terminal privileges are not reset when a user logs out.

  • CVE-2001-1514

    Does not properly pass security context to child processes in certain cases, allows privilege escalation.

  • CVE-2001-0128

    Does not properly compute roles.

  • CVE-1999-1193

    untrusted user placed in unix "wheel" group

  • CVE-2005-2741

    Product allows users to grant themselves certain rights that can be used to escalate privileges.

  • CVE-2005-2496

    Product uses group ID of a user instead of the group, causing it to run with different privileges. This is resultant from some other unknown issue.

  • CVE-2004-0274

    Product mistakenly assigns a particular status to an entity, leading to increased privileges.

  • CVE-2007-4217

    FTP client program on a certain OS runs with setuid privileges and has a buffer overflow. Most clients do not need extra privileges, so an overflow is not a vulnerability for those clients.

Comment les attaquants l'exploitent

Parcours de l'attaquant étape par étape

  1. 1

    This code temporarily raises the program's privileges to allow creation of a new user folder.

  2. 2

    While the program only raises its privilege level to create the folder and immediately lowers it again, if the call to os.mkdir() throws an exception, the call to lowerPrivileges() will not occur. As a result, the program is indefinitely operating in a raised privilege state, possibly allowing further exploitation to occur.

  3. 3

    The following example demonstrates the weakness.

  4. 4

    The following example demonstrates the weakness.

  5. 5

    This code intends to allow only Administrators to print debug information about a system.

Exemple de code vulnérable

Vulnerable Python

This code temporarily raises the program's privileges to allow creation of a new user folder.

Vulnérable Python 
def makeNewUserDir(username):
  		if invalidUsername(username):
```
#avoid CWE-22 and CWE-78* 
  				print('Usernames cannot contain invalid characters')
  				return False
  		try:
  		```
  			raisePrivileges()
  			os.mkdir('/home/' + username)
  			lowerPrivileges()
  		except OSError:
  			print('Unable to create new user directory for user:' + username)
  			return False
  		return True
Exemple de code sécurisé

Secure pseudo

Sécurisé pseudo 
// Validate, sanitize, or use a safe API before reaching the sink.
function handleRequest(input) {
  const safe = validateAndEscape(input);
  return executeWithGuards(safe);
}
What changed: the unsafe sink is replaced (or the input is validated/escaped) so the same payload no longer triggers the weakness.
Liste de contrôle de prévention

How to prevent CWE-269

  • Architecture and Design / Operation Very carefully manage the setting, management, and handling of privileges. Explicitly manage trust zones in the software.
  • Architecture and Design Follow the principle of least privilege when assigning access rights to entities in a software system.
  • Architecture and Design Consider following the principle of separation of privilege. Require multiple conditions to be met before permitting access to a system resource.
Signaux de détection

How to detect CWE-269

Automated Static Analysis High

Automated static analysis, commonly referred to as Static Application Security Testing (SAST), can find some instances of this weakness by analyzing source code (or binary/compiled code) without having to execute it. Typically, this is done by building a model of data flow and control flow, then searching for potentially-vulnerable patterns that connect "sources" (origins of input) with "sinks" (destinations where the data interacts with external components, a lower layer such as the OS, etc.)

Correction automatique Plexicus

Plexicus détecte automatiquement CWE-269 et ouvre une PR de correction en moins de 60 secondes.

Codex Remedium analyse chaque commit, identifie cette faiblesse précise et livre une pull request prête à être relue avec le correctif. Pas de tickets. Pas de transferts.

Obtenir une démo Essayer Plexicus gratuitement
Questions fréquentes

Frequently asked questions

Qu'est-ce que CWE-269 ?

This vulnerability occurs when an application fails to correctly manage user permissions, allowing someone to perform actions or access data beyond their intended authority.

Quelle est la gravité de CWE-269 ?

MITRE évalue la probabilité d'exploitation comme Moyenne — l'exploitation est réaliste mais nécessite généralement des conditions spécifiques.

Quels langages ou plateformes sont affectés par CWE-269 ?

MITRE n'a pas spécifié les plateformes affectées pour ce CWE — il peut s'appliquer à la plupart des stacks applicatives.

Comment puis-je prévenir CWE-269 ?

Very carefully manage the setting, management, and handling of privileges. Explicitly manage trust zones in the software. Follow the principle of least privilege when assigning access rights to entities in a software system.

Comment Plexicus détecte et corrige CWE-269 ?

Le moteur SAST de Plexicus reconnaît la signature de flux de données de CWE-269 à chaque commit. Lorsqu'une correspondance est trouvée, notre agent Codex Remedium ouvre une PR de correction avec le code corrigé, les tests et un résumé d'une ligne pour le relecteur.

Où puis-je en savoir plus sur CWE-269 ?

MITRE publie la définition canonique à https://cwe.mitre.org/data/definitions/269.html. Vous pouvez également consulter la documentation OWASP et NIST pour des conseils adjacents.

Faiblesses associées

Weaknesses related to CWE-269

CWE-284 Parent

Improper Access Control

The software fails to properly limit who can access a resource, allowing unauthorized users or systems to interact with it.

CWE-1191 Frère

On-Chip Debug and Test Interface With Improper Access Control

This vulnerability occurs when a hardware chip's debug or test interface (like JTAG) lacks proper access controls. Without correct…

CWE-1220 Frère

Insufficient Granularity of Access Control

This vulnerability occurs when a system's access controls are too broad, allowing unauthorized users or processes to read or modify…

CWE-1224 Frère

Improper Restriction of Write-Once Bit Fields

This vulnerability occurs when hardware write-once protection mechanisms, often called 'sticky bits,' are incorrectly implemented,…

CWE-1231 Frère

Improper Prevention of Lock Bit Modification

This vulnerability occurs when hardware or firmware uses a lock bit to protect critical system registers or memory regions, but fails to…

CWE-1233 Frère

Security-Sensitive Hardware Controls with Missing Lock Bit Protection

This vulnerability occurs when a hardware device uses a lock bit to protect critical configuration registers, but the lock fails to…

CWE-1252 Frère

CPU Hardware Not Configured to Support Exclusivity of Write and Execute Operations

This vulnerability occurs when a CPU's hardware is not set up to enforce a strict separation between writing data to memory and executing…

CWE-1257 Frère

Improper Access Control Applied to Mirrored or Aliased Memory Regions

This vulnerability occurs when a hardware design maps the same physical memory to multiple addresses (aliasing or mirroring) but fails to…

CWE-1259 Frère

Improper Restriction of Security Token Assignment

This vulnerability occurs when a System-on-a-Chip (SoC) fails to properly secure its Security Token mechanism. These tokens control which…

Ressources

Further reading

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