CAPEC-477 — Signature Spoofing by Mixing Signed and Unsigned Content
CAPEC-477: Signature Spoofing by Mixing Signed and Unsigned Content
MITRE CAPEC attack pattern
| Status | Draft |
| Typical severity | High |
| Likelihood of attack | Low |
| Catalogue | CAPEC 3.9 (2023-01-24) |
Description
An attacker exploits the underlying complexity of a data structure that allows for both signed and unsigned content, to cause unsigned data to be processed as though it were signed data.
Where this sits in the chain
A finding maps to a weakness (CWE), a weakness is exploited by an attack pattern (CAPEC), and an attack pattern shows up in ATT&CK as observed adversary behaviour. This page is the middle hop.
Weaknesses exploited: CWE-311, CWE-319, CWE-693
Prerequisites
- Signer and recipient are using complex data storage structures that allow for a mix between signed and unsigned data
- Recipient is using signature verification software that does not maintain separation between signed and unsigned data once the signature has been verified.
Skills required
- High: The attacker may need to continuously monitor a stream of signed data, waiting for an exploitable message to appear.
- High: Attacker must be able to create malformed data blobs and know how to insert them in a location that the recipient will visit.
Mitigations
- Ensure the application is fully patched and does not allow the processing of unsigned data as if it is signed data.