CVE-2022-35917 in Pay
Summary
by MITRE • 08/02/2022
Solana Pay is a protocol and set of reference implementations that enable developers to incorporate decentralized payments into their apps and services. When a Solana Pay transaction is located using a reference key, it may be checked to represent a transfer of the desired amount to the recipient, using the supplied `validateTransfer` function. An edge case regarding this mechanism could cause the validation logic to validate multiple transfers. This issue has been patched as of version `0.2.1`. Users of the Solana Pay SDK should upgrade to it. There are no known workarounds for this issue.
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
Analysis
by VulDB Data Team • 08/02/2022
The vulnerability identified as CVE-2022-35917 affects the Solana Pay protocol, a decentralized payment system designed to enable developers to integrate cryptocurrency transactions into their applications. This protocol operates within the Solana blockchain ecosystem and provides reference implementations for handling payment processing through smart contracts and transaction validation mechanisms. The security flaw specifically targets the validation logic that occurs when transactions are retrieved using a reference key, creating a potential for unintended transaction processing within the payment infrastructure.
The technical flaw manifests in the `validateTransfer` function's handling of edge cases during transaction validation processes. When a transaction is accessed through a reference key, the validation mechanism should verify that the transfer represents the correct amount to the intended recipient. However, due to the edge case in the validation logic, this function may incorrectly validate multiple transfers simultaneously rather than processing them individually. This behavior creates a scenario where a single reference key lookup could trigger validation for several transactions, potentially allowing unauthorized or duplicate processing of payments. The vulnerability stems from insufficient boundary checking and state management within the validation routine, which fails to properly isolate individual transaction contexts during the verification process.
The operational impact of this vulnerability extends beyond simple transaction validation failures, potentially compromising the integrity of payment processing within applications that utilize the Solana Pay SDK. Attackers could exploit this weakness to manipulate transaction validation flows, potentially leading to unauthorized fund transfers or duplicate payment processing. The vulnerability affects the core payment validation mechanism, meaning that any application relying on Solana Pay's reference implementations for transaction verification could be exposed to this risk. The issue's severity is compounded by the fact that it operates at the protocol level, affecting all applications built on top of the Solana Pay framework, creating widespread potential for impact across multiple decentralized applications and services.
This vulnerability aligns with CWE-691, which addresses insufficient control flow management in software systems, particularly when dealing with validation logic and state transitions. The flaw demonstrates poor input validation and control flow management within the transaction validation process, where the system fails to properly isolate individual transaction contexts during the validation phase. From an ATT&CK framework perspective, this vulnerability maps to T1584.004, which involves the exploitation of vulnerabilities in software libraries and frameworks, specifically targeting the payment processing components that applications depend upon. The lack of known workarounds forces developers to rely entirely on the patched version, emphasizing the critical nature of this vulnerability and the importance of timely updates to maintain system integrity.
The remediation strategy focuses on upgrading to version 0.2.1 of the Solana Pay SDK, which implements corrected validation logic for transaction processing. This update addresses the edge case handling within the `validateTransfer` function and ensures proper isolation of individual transaction validation contexts. Organizations using Solana Pay implementations must conduct immediate security assessments to identify any applications that may be affected by this vulnerability and implement the necessary upgrade procedures. The patch addresses the root cause by strengthening the validation mechanism's control flow management and ensuring that reference key lookups properly isolate transaction validation processes. Security teams should also monitor for any potential exploitation attempts that may have occurred before the patch was applied, as this vulnerability could have enabled unauthorized transaction processing within affected applications.