Improper Authentication
Weakness ID: 287 (Weakness Class)Status: Draft
+ Description

Description Summary

When an actor claims to have a given identity, the software does not prove or insufficiently proves that the claim is correct.
+ Alternate Terms

An alternate term is "authentification", which appears to be most commonly used by people from non-English-speaking countries.


"AuthC" is typically used as an abbreviation of "authentication" within the web application security community. It is also distinct from "AuthZ," which is an abbreviation of "authorization." The use of "Auth" as an abbreviation is discouraged, since it could be used for either authentication or authorization.

+ Time of Introduction
  • Architecture and Design
  • Implementation
+ Applicable Platforms



+ Common Consequences
Access Control

This weakness can lead to the exposure of resources or functionality to unintended actors, possibly providing attackers with sensitive information or even execute arbitrary code.

+ Likelihood of Exploit

Medium to High

+ Detection Methods

Automated Static Analysis

Automated static analysis is useful for detecting certain types of authentication. A tool may be able to analyze related configuration files, such as .htaccess in Apache web servers, or detect the usage of commonly-used authentication libraries.

Generally, automated static analysis tools have difficulty detecting custom authentication schemes. In addition, the software's design may include some functionality that is accessible to any user and does not require an established identity; an automated technique that detects the absence of authentication may report false positives.

Effectiveness: Limited

Manual Static Analysis

This weakness can be detected using tools and techniques that require manual (human) analysis, such as penetration testing, threat modeling, and interactive tools that allow the tester to record and modify an active session.

Manual static analysis is useful for evaluating the correctness of custom authentication mechanisms.

Effectiveness: High

These may be more effective than strictly automated techniques. This is especially the case with weaknesses that are related to design and business rules.

+ Demonstrative Examples

Example 1

The following code intends to ensure that the user is already logged in. If not, the code performs authentication with the user-provided username and password. If successful, it sets the loggedin and user cookies to "remember" that the user has already logged in. Finally, the code performs administrator tasks if the logged-in user has the "Administrator" username, as recorded in the user cookie.

(Bad Code)
my $q = new CGI;

if ($q->cookie('loggedin') ne "true") {
if (! AuthenticateUser($q->param('username'), $q->param('password'))) {
ExitError("Error: you need to log in first");
else {
# Set loggedin and user cookies.
-name => 'loggedin',
-value => 'true'
-name => 'user',
-value => $q->param('username')

if ($q->cookie('user') eq "Administrator") {

Unfortunately, this code can be bypassed. The attacker can set the cookies independently so that the code does not check the username and password. The attacker could do this with an HTTP request containing headers such as:

GET /cgi-bin/vulnerable.cgi HTTP/1.1
Cookie: user=Administrator
Cookie: loggedin=true

[body of request]

By setting the loggedin cookie to "true", the attacker bypasses the entire authentication check. By using the "Administrator" value in the user cookie, the attacker also gains privileges to administer the software.

Example 2

In January 2009, an attacker was able to gain administrator access to a Twitter server because the server did not restrict the number of login attempts. The attacker targeted a member of Twitter's support team and was able to successfully guess the member's password using a brute force with a large number of common words. Once the attacker gained access as the member of the support staff, he used the administrator panel to gain access to 33 accounts that belonged to celebrities and politicians. Ultimately, fake Twitter messages were sent that appeared to come from the compromised accounts.

Example 2 References:

Kim Zetter. "Weak Password Brings ‘Happiness’ to Twitter Hacker". 2009-01-09. <>.
+ Observed Examples
CVE-2009-3421login script for guestbook allows bypassing authentication by setting a "login ok" parameter to 1.
CVE-2009-2382admin script allows authentication bypass by setting a cookie value to "LOGGEDIN".
CVE-2009-1048VOIP product allows authentication bypass using in the Host header.
CVE-2009-2213product uses default "Allow" action, instead of default deny, leading to authentication bypass.
CVE-2009-2168chain: redirect without exit (CWE-698) leads to resultant authentication bypass.
CVE-2009-3107product does not restrict access to a listening port for a critical service, allowing authentication to be bypassed.
CVE-2009-1596product does not properly implement a security-related configuration setting, allowing authentication bypass.
CVE-2009-2422authentication routine returns "nil" instead of "false" in some situations, allowing authentication bypass using an invalid username.
CVE-2009-3232authentication update script does not properly handle when admin does not select any authentication modules, allowing authentication bypass.
CVE-2009-3231use of LDAP authentication with anonymous binds causes empty password to result in successful authentication
CVE-2005-3435product authentication succeeds if user-provided MD5 hash matches the hash in its database; this can be subjected to replay attacks.
CVE-2005-0408chain: product generates predictable MD5 hashes using a constant value combined with username, allowing authentication bypass.
+ Potential Mitigations

Phase: Architecture and Design

Strategy: Libraries or Frameworks

Use an authentication framework or library such as the OWASP ESAPI Authentication feature.

+ Relationships
NatureTypeIDNameView(s) this relationship pertains toView(s)
ChildOfCategoryCategory254Security Features
Development Concepts (primary)699
ChildOfWeakness ClassWeakness Class693Protection Mechanism Failure
Research Concepts (primary)1000
ChildOfCategoryCategory718OWASP Top Ten 2007 Category A7 - Broken Authentication and Session Management
Weaknesses in OWASP Top Ten (2007) (primary)629
ChildOfCategoryCategory724OWASP Top Ten 2004 Category A3 - Broken Authentication and Session Management
Weaknesses in OWASP Top Ten (2004) (primary)711
ParentOfWeakness ClassWeakness Class300Channel Accessible by Non-Endpoint ('Man-in-the-Middle')
Development Concepts (primary)699
Research Concepts (primary)1000
ParentOfWeakness VariantWeakness Variant301Reflection Attack in an Authentication Protocol
Development Concepts (primary)699
Research Concepts (primary)1000
ParentOfWeakness BaseWeakness Base303Incorrect Implementation of Authentication Algorithm
Development Concepts (primary)699
Research Concepts (primary)1000
ParentOfWeakness BaseWeakness Base304Missing Critical Step in Authentication
Development Concepts (primary)699
ParentOfWeakness VariantWeakness Variant306Missing Authentication for Critical Function
Development Concepts (primary)699
Research Concepts (primary)1000
ParentOfWeakness BaseWeakness Base307Improper Restriction of Excessive Authentication Attempts
Development Concepts (primary)699
Research Concepts (primary)1000
ParentOfWeakness BaseWeakness Base308Use of Single-factor Authentication
Development Concepts (primary)699
Research Concepts (primary)1000
ParentOfWeakness BaseWeakness Base309Use of Password System for Primary Authentication
Development Concepts (primary)699
Research Concepts (primary)1000
ParentOfWeakness BaseWeakness Base322Key Exchange without Entity Authentication
Research Concepts (primary)1000
ParentOfCompound Element: CompositeCompound Element: Composite384Session Fixation
Development Concepts699
Research Concepts (primary)1000
ParentOfWeakness ClassWeakness Class592Authentication Bypass Issues
Development Concepts (primary)699
Research Concepts (primary)1000
ParentOfWeakness BaseWeakness Base603Use of Client-Side Authentication
Development Concepts (primary)699
Research Concepts1000
ParentOfWeakness BaseWeakness Base645Overly Restrictive Account Lockout Mechanism
Development Concepts (primary)699
Research Concepts (primary)1000
ParentOfWeakness BaseWeakness Base798Use of Hard-coded Credentials
Research Concepts (primary)1000
ParentOfWeakness BaseWeakness Base804Guessable CAPTCHA
Development Concepts699
Research Concepts1000
MemberOfViewView635Weaknesses Used by NVD
Weaknesses Used by NVD (primary)635
CanFollowWeakness BaseWeakness Base304Missing Critical Step in Authentication
Research Concepts1000
CanFollowWeakness BaseWeakness Base613Insufficient Session Expiration
Development Concepts699
Research Concepts1000
+ Relationship Notes

This can be resultant from SQL injection vulnerabilities and other issues.

+ Functional Areas
  • Authentication
+ Taxonomy Mappings
Mapped Taxonomy NameNode IDFitMapped Node Name
PLOVERAuthentication Error
OWASP Top Ten 2007A7CWE More SpecificBroken Authentication and Session Management
OWASP Top Ten 2004A3CWE More SpecificBroken Authentication and Session Management
WASC1Insufficient Authentication
+ Related Attack Patterns
CAPEC-IDAttack Pattern Name
(CAPEC Version: 1.4)
22Exploiting Trust in Client (aka Make the Client Invisible)
94Man in the Middle Attack
57Utilizing REST's Trust in the System Resource to Register Man in the Middle
114Authentication Abuse
+ References
OWASP. "Top 10 2007-Broken Authentication and Session Management". <>.
OWASP. "Guide to Authentication". <>.
Microsoft. "Authentication". <>.
[REF-11] M. Howard and D. LeBlanc. "Writing Secure Code". Chapter 4, "Authentication" Page 109. 2nd Edition. Microsoft. 2002.
+ Content History
Submission DateSubmitterOrganizationSource
PLOVERExternally Mined
Modification DateModifierOrganizationSource
2008-07-01Eric DalciCigitalExternal
updated Time of Introduction
Suggested OWASP Top Ten 2004 mapping
2008-09-08CWE Content TeamMITREInternal
updated Alternate Terms, Common Consequences, Relationships, Relationship Notes, Taxonomy Mappings
2008-10-14CWE Content TeamMITREInternal
updated Relationships
2009-01-12CWE Content TeamMITREInternal
updated Name
2009-05-27CWE Content TeamMITREInternal
updated Description, Related Attack Patterns
2009-07-27CWE Content TeamMITREInternal
updated Relationships
2009-10-29CWE Content TeamMITREInternal
updated Common Consequences, Observed Examples
2009-12-28CWE Content TeamMITREInternal
updated Applicable Platforms, Common Consequences, Demonstrative Examples, Detection Factors, Likelihood of Exploit, References
Previous Entry Names
Change DatePrevious Entry Name
2008-04-11Authentication Issues
2009-01-12Insufficient Authentication