Top 10 2013-A2-Broken Authentication and Session Management

From OWASP
Revision as of 20:02, 13 June 2013 by Neil Smithline (Talk | contribs)

Jump to: navigation, search
[[Top 10 {{{year}}}-Injection|← Injection]]
2013 Table of Contents

2013 Top 10 List

[[Top 10 {{{year}}}-Cross-Site Scripting (XSS)|Cross-Site Scripting (XSS) →]]
Threat Agents Attack Vectors Security Weakness Technical Impacts Business Impacts
Application Specific Exploitability
AVERAGE
Prevalence
WIDESPREAD
Detectability
AVERAGE
Impact
SEVERE
Application / Business Specific

Consider anonymous external attackers, as well as users with their own accounts, who may attempt to steal accounts from others. Also consider insiders wanting to disguise their actions.

Attacker uses leaks or flaws in the authentication or session management functions (e.g., exposed accounts, passwords, session IDs) to impersonate users.

Developers frequently build custom authentication and session management schemes, but building these correctly is hard. As a result, these custom schemes frequently have flaws in areas such as logout, password management, timeouts, remember me, secret question, account update, etc. Finding such flaws can sometimes be difficult, as each implementation is unique.

Such flaws may allow some or even all accounts to be attacked. Once successful, the attacker can do anything the victim could do. Privileged accounts are frequently targeted.

Consider the business value of the affected data or application functions.

Also consider the business impact of public exposure of the vulnerability.

Am I Vulnerable To 'Broken Authentication and Session Management'?

Are session management assets like user credentials and session IDs properly protected? You may be vulnerable if:

  1. User authentication credentials aren’t protected when stored using hashing or encryption. See A6.
  2. Credentials can be guessed or overwritten through weak account management functions (e.g., account creation, change password, recover password, weak session IDs).
  3. Session IDs are exposed in the URL (e.g., URL rewriting).
  4. Session IDs are vulnerable to session fixation attacks.
  5. Session IDs don’t timeout, or user sessions or authentication tokens, particularly single sign-on (SSO) tokens, aren’t properly invalidated during logout.
  6. Session IDs aren’t rotated after successful login.
  7. Passwords, session IDs, and other credentials are sent over unencrypted connections. See A6.

See the ASVS requirement areas V2 and V3 for more details.


How Do I Prevent 'Broken Authentication and Session Management'?

The primary recommendation for an organization is to make available to developers:

  1. A single set of strong authentication and session management controls. Such controls should strive to:
    1. meet all the authentication and session management requirements defined in OWASP’s Application Security Verification Standard (ASVS) areas V2 (Authentication) and V3 (Session Management).
    2. have a simple interface for developers. Consider the ESAPI Authenticator and User APIs as good examples to emulate, use, or build upon.
  2. Strong efforts should also be made to avoid XSS flaws which can be used to steal session IDs. See A3.
Example Attack Scenarios

Scenario #1: Airline reservations application supports URL rewriting, putting session IDs in the URL:

http://example.com/sale/saleitems
jsessionid=2P0OC2JSNDLPSKHCJUN2JV?dest=Hawaii

blank

References

OWASP For a more complete set of requirements and problems to avoid in this area, see the ASVS requirements areas for Authentication (V2) and Session Management (V3).

External

[[Top 10 {{{year}}}-Injection|← Injection]]
2013 Table of Contents

2013 Top 10 List

[[Top 10 {{{year}}}-Cross-Site Scripting (XSS)|Cross-Site Scripting (XSS) →]]

© 2002-2013 OWASP Foundation This document is licensed under the Creative Commons Attribution-ShareAlike 3.0 license. Some rights reserved. CC-by-sa-3 0-88x31.png
[[Category:OWASP Top Ten {{{year}}} Project]]