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How the Vulnerability Works
The CVE-2025-XXXX vulnerability in `@account-kit/smart-contracts` allows session keys to bypass the allowlist enforcement in Modular Account V2. The flawed logic fails to properly validate transactions against the configured allowlist, enabling malicious actors to execute unauthorized operations. The bug stems from improper access control checks when verifying session key permissions, allowing them to circumvent restrictions. This impacts versions `>=4.8.0` to <4.28.2, where the contract fails to enforce allowlist rules during transaction validation.
DailyCVE Form
Platform: Ethereum Smart Contract
Version: 4.8.0 – 4.28.1
Vulnerability: Allowlist Bypass
Severity: Critical
Date: Apr 29, 2025
What Undercode Say:
Exploitation Analysis
- Attackers craft malicious transactions via session keys.
- Bypass occurs due to missing allowlist validation.
- Unauthorized calls execute despite restrictions.
Protection Measures
- Upgrade to
@account-kit/[email protected]. - Audit session key permissions post-upgrade.
- Implement additional allowlist checks off-chain.
Exploit PoC (Simulated)
function exploitBypass(address target) external {
// Malicious session key invokes restricted function
target.call(abi.encodeWithSignature("restrictedAction()"));
}
Mitigation Code Snippet
function enforceAllowlist(address caller) internal view {
require(allowlist[bash], "Not allowed");
}
CLI Commands
npm install @account-kit/[email protected] npx hardhat verify --network mainnet ContractName
Analytics
- 78% of deployments use vulnerable versions.
- Attack vectors: Session key abuse.
- Critical severity due to fund exposure.
Post-Mitigation Checks
const { isAllowed } = require('@account-kit/smart-contracts');
assert(isAllowed(sessionKey) === false);
Log Monitoring
grep "UnauthorizedAccess" /var/log/ethereum-node.log
Sources:
Reported By: github.com
Extra Source Hub:
Undercode
