Full Report
When a user is creating a loan, they provide the signature of the opposite party. If the sender of the call is a borrower, then the lender would need to be the other signature. All of these signatures are validated within the protocol. The side of the signature is not validated though. As a result, an attacker can force a signature to be used for the wrong purpose. In particular, a signature for a borrow can be used to force a user to become a lender. Cryptography is great! However, the use case is just as important as the math.
Analysis Summary
Based on the provided article context, the vulnerability appears to be described specifically within the provided text block regarding a loan creation process, likely within a custom protocol or smart contract system (given the context of signature validation and cryptographic operations). **Crucially, the provided text does not contain any specific CVE identifiers, severity scores, affected product names/versions, or direct remediation information (patches/workarounds).**
Therefore, the summary below reflects the information that *can* be inferred and explicitly states where information is missing based solely on the input context.
# Vulnerability: Role Confusion via Unvalidated Signature Context
## CVE Details
- CVE ID: N/A (Not provided in context)
- CVSS Score: N/A (Not provided in context)
- CWE: CWE-345: Reliance by External Party on Non-Validated Input (Best fit, as the 'side' of the signature is not validated and used externally to define a financial role)
## Affected Systems
- Products: Protocol handling loan creation signatures (Specific application name unknown)
- Versions: Unknown
- Configurations: Systems where loan participants provide signatures for validation but the *role* associated with that signature (borrower or lender) is not strictly enforced or checked against the expectation.
## Vulnerability Description
The vulnerability lies in the signature validation process during loan creation. While the cryptographic validity of the provided signatures is enforced, the system fails to validate which *party* (borrower or lender) supplied the signature intended for their respective role. An attacker who is a borrower can supply the signature that should obligate them as a borrower, but the protocol mistakenly accepts it in a context that forces the counterparty (the intended lender) into the role of the borrower (or vice versa, turning a lender into a borrower). This is a misuse of cryptography due to incorrect application context validation.
## Exploitation
- Status: Undetermined based on context, assumed not actively exploited in the wild without further data.
- Complexity: Low (If the mechanism for submission is simple, exploiting a lack of role check is often straightforward).
- Attack Vector: Network (Transaction submission to the protocol)
## Impact
- Confidentiality: Low (Primarily a loss of control over financial standing)
- Integrity: High (An attacker can force a legitimate user into an unintended financial obligation, such as becoming a lender when they intended to borrow, or vice versa.)
- Availability: Low (The system remains available, but its correct functioning for financial agreements is broken.)
## Remediation
### Patches
- Patches are not detailed in the provided context. The required fix would involve updating the signature validation logic to strictly verify that the signature provided matches the role expected of the signing party in that specific transaction step (e.g., verifying the borrower's signature is indeed provided when the system expects the borrower's sign-off).
### Workarounds
- No specific workarounds were provided in the context. A potential manual mitigation (if possible outside the protocol) would be enhanced off-chain monitoring to detect role reversal transactions before final confirmation, if such a state exists.
## Detection
- Indicators of Compromise: Transactions showing a participant accepting a financial role (e.g., becoming a lender) that contradicts their initial intention or typical activity profile for that specific loan event.
- Detection Methods and Tools: Auditing transaction logs for calls where the required on-chain signature role does not align with the expected sequence of events, focusing on the role assignment logic post-signature checks.
## References
- Vendor advisories: None provided.
- Relevant links: hXXps://github[.]com/MiloTruck/audits/blob/main/immunefi/arcadexyz-H-01.md