Missing Check for Certificate Revocation after Initial Check

Opis

The product does not check the revocation status of a certificate after its initial revocation check, which can cause the product to perform privileged actions even after the certificate is revoked at a later time.

If the revocation status of a certificate is not checked before each action that requires privileges, the system may be subject to a race condition. If a certificate is revoked after the initial check, all subsequent actions taken with the owner of the revoked certificate will lose all benefits guaranteed by the certificate. In fact, it is almost certain that the use of a revoked certificate indicates malicious activity.

Skutki

• Access Control

  Gain Privileges or Assume Identity

  Trust may be assigned to an entity who is not who it claims to be.

• Integrity

  Modify Application Data

  Data from an untrusted (and possibly malicious) source may be integrated.

• Confidentiality

  Read Application Data

  Data may be disclosed to an entity impersonating a trusted entity, resulting in information disclosure.

Zapobieganie

• Architecture and Design

  Ensure that certificates are checked for revoked status before each use of a protected resource. If the certificate is checked before each access of a protected resource, the delay subject to a possible race condition becomes almost negligible and significantly reduces the risk associated with this issue.

Słabość nadrzędna

• CWE-299 Improper Check for Certificate Revocation

Pokrewna

• CWE-296 Improper Following of a Certificate's Chain of Trust
• CWE-297 Improper Validation of Certificate with Host Mismatch
• CWE-298 Improper Validation of Certificate Expiration

Kiedy powstaje

• Implementation

Dotyczy

Not Language-Specific

Źródła

1. The CLASP Application Security Process — Secure Software, Inc., 2005
2. 24 Deadly Sins of Software Security — Michael Howard, David LeBlanc, John Viega, "Sin 13: Race Conditions." Page 205, McGraw-Hill, 2010