CAPEC-473: Signature Spoof

Description
An attacker generates a message or datablock that causes the recipient to believe that the message or datablock was generated and cryptographically signed by an authoritative or reputable source, misleading a victim or victim operating system into performing malicious actions.
Extended Description

By having control of some text in the victim's domain, the attacker is able to inject a seemingly valid CSS string. It does not matter if this CSS string is preceded by other data. The CSS parser will still locate the CSS string. If the attacker is able to control two injection points, one before the cross domain data that the attacker is interested in receiving and the other one after, the attacker can use this attack to steal all of the data in between these two CSS injection points when referencing the injected CSS while performing rendering on the site that the attacker controls. When rendering, the CSS parser will detect the valid CSS string to parse and ignore the data that "does not make sense". That data will simply be rendered. That data is in fact the data that the attacker just stole cross domain. The stolen data may contain sensitive information, such CSRF protection tokens.

Severity :

Possibility :

Type :

Standard
Relationships with other CAPECs

This table shows the other attack patterns and high level categories that are related to this attack pattern.

CAPEC-151: Identity Spoofing Identity Spoofing CAPEC-459: Creating a Rogue Certification Authority Certificate Creating a Rogue Certification Authority Certificate CAPEC-474: Signature Spoofing by Key Theft Signature Spoofing by Key Theft CAPEC-475: Signature Spoofing by Improper Validation Signature Spoofing by Improper Validation CAPEC-476: Signature Spoofing by Misrepresentation Signature Spoofing by Misrepresentation CAPEC-477: Signature Spoofing by Mixing Signed and Unsigned Content Signature Spoofing by Mixing Signed and Unsigned Content CAPEC-479: Malicious Root Certificate Malicious Root Certificate CAPEC-485: Signature Spoofing by Key Recreation Signature Spoofing by Key Recreation
Prerequisites

This table shows the other attack patterns and high level categories that are related to this attack pattern.

  • The victim or victim system is dependent upon a cryptographic signature-based verification system for validation of one or more security events or actions.
  • The validation can be bypassed via an attacker-provided signature that makes it appear that the legitimate authoritative or reputable source provided the signature.
Skills required

This table shows the other attack patterns and high level categories that are related to this attack pattern.

  • High Technical understanding of how signature verification algorithms work with data and applications
Taxonomy mappings

Mappings to ATT&CK, OWASP and other frameworks.

ATTACK | Masquerading: Invalid Code Signature ATTACK | Subvert Trust Controls: Code Signing
Related CWE

A Related Weakness relationship associates a weakness with this attack pattern. Each association implies a weakness that must exist for a given attack to be successful.

CWE-20: Improper Input Validation

CWE-290: Authentication Bypass by Spoofing

CWE-327: Use of a Broken or Risky Cryptographic Algorithm

Visit http://capec.mitre.org/ for more details.