UXLINK Multi-Signature Wallet Compromised by Delegate Call Vulnerability → Security

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Briefing

A critical security incident has impacted the UXLINK protocol, stemming from a delegate call vulnerability within its multi-signature wallet. This flaw enabled an attacker to gain administrative control, facilitating unauthorized transfers and the arbitrary minting of tokens. The immediate consequence was the illicit acquisition of approximately $6.8 million in Ethereum, which the attacker subsequently converted into DAI stablecoins to obscure the financial trail. This event underscores the persistent risks associated with complex smart contract interactions and the imperative for rigorous security auditing in decentralized finance.

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Context

Prior to this incident, multi-signature wallets were widely perceived as a robust security measure, requiring multiple approvals for transactions, thereby mitigating single points of failure. However, the prevailing attack surface included potential misconfigurations or faulty code implementations within these complex setups, alongside human-centric risks such as phishing or compromised private keys. This exploit specifically leveraged a known class of vulnerability related to call protocols, demonstrating that even established security paradigms can harbor critical weaknesses if underlying code logic is not impeccably secured.

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Analysis

The incident’s technical mechanics involved the exploitation of a delegate call vulnerability present in UXLINK’s multi-signature wallet. This specific flaw provided the attacker with administrator-level access, effectively bypassing the intended multi-party authorization mechanism. With elevated privileges, the malicious actor executed unauthorized transfers and initiated unlimited token minting, creating vast quantities of CRUXLINK tokens on the Arbitrum blockchain. The attacker then swiftly liquidated these newly minted tokens for ETH, USDC, and other assets, subsequently converting approximately 1,620 ETH, valued at $6.8 million, into DAI stablecoins to complicate traceability.

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Parameters

Protocol Targeted → UXLINK
Vulnerability → Delegate Call Vulnerability in Multi-Signature Wallet
Financial Impact → $6.8 Million (initially ETH, converted to DAI)
Blockchain Affected → Arbitrum (for token minting), Ethereum (for ETH conversion)
Attack Start Date → September 22, 2025
Attacker Action → Unauthorized Transfers, Unlimited Token Minting, Fund Conversion

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Outlook

Immediate mitigation for users involves verifying the security posture of any protocol utilizing multi-signature wallets and ensuring that all smart contracts undergo comprehensive, independent audits. This incident highlights the potential for second-order effects on similar protocols employing comparable delegate call functionalities or multi-signature wallet implementations, necessitating a thorough review of their codebase. The event will likely catalyze the establishment of new security best practices, emphasizing enhanced transparency in token minting procedures and more stringent audit standards for complex smart contract interactions, particularly those involving administrative privileges.

The UXLINK exploit serves as a critical reminder that even foundational security mechanisms like multi-signature wallets require impeccable smart contract implementation to prevent administrative compromise and safeguard digital assets.

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