CVE-2022-25335 in Dragos
Summary
by MITRE • 02/18/2022
RigoBlock Dragos through 2022-02-17 lacks the onlyOwner modifier for setMultipleAllowances. This enables token manipulation, as exploited in the wild in February 2022. NOTE: although 2022-02-17 is the vendor's vulnerability announcement date, the vulnerability will not be remediated until a major protocol upgrade occurs.
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Analysis
by VulDB Data Team • 02/18/2022
The vulnerability in RigoBlock Dragos represents a critical access control flaw that undermines the security foundation of the token contract. This issue manifests through the absence of the onlyOwner modifier on the setMultipleAllowances function, creating an unauthorized pathway for privilege escalation attacks. The omission of this essential access control mechanism allows any external actor to manipulate token allowances without proper authorization, effectively compromising the integrity of the entire token ecosystem.
From a technical perspective, the vulnerability stems from improper function access control implementation within the smart contract code. The setMultipleAllowances function should only be callable by the contract owner to prevent unauthorized modifications to token allowance configurations. Without the onlyOwner modifier, any address can invoke this function and manipulate allowance values, potentially enabling malicious actors to grant excessive spending permissions or alter existing allowances in ways that benefit attackers while harming legitimate users.
The operational impact of this vulnerability became evident through real-world exploitation in February 2022, demonstrating how theoretical security flaws can translate into actual financial losses. This attack vector represents a classic privilege escalation technique that aligns with attack patterns documented in the MITRE ATT&CK framework under privilege escalation tactics. The vulnerability's exploitation likely involved unauthorized users calling setMultipleAllowances with malicious parameters to manipulate token balances or approve unauthorized spending, potentially resulting in significant financial losses for affected parties.
This particular vulnerability falls under CWE-284, which specifically addresses improper access control in software systems. The lack of proper authorization checks creates a direct pathway for unauthorized modifications to critical contract state variables. The security implications extend beyond simple allowance manipulation, as this flaw could enable broader system compromise through cascading effects on other functions that depend on proper allowance management.
The remediation approach for this vulnerability requires protocol-level intervention rather than simple code patching, as indicated by the vendor's statement regarding the need for a major protocol upgrade. This suggests that the underlying architecture or contract structure cannot be easily modified without comprehensive system redesign. Organizations should monitor for any updates related to the required protocol upgrade and implement defensive measures such as thorough contract audits, enhanced monitoring of allowance changes, and consideration of alternative token implementations until the proper remediation occurs.
Security teams should treat this vulnerability as a high-priority concern given its demonstrated exploitation in the wild and the potential for significant financial impact. The lack of immediate patch availability underscores the importance of proactive security measures such as contract monitoring, user education about unauthorized access patterns, and implementation of additional controls to detect and prevent unauthorized allowance modifications. This incident highlights the critical need for comprehensive access control validation in smart contract development processes and demonstrates how seemingly minor oversights can create major security risks in decentralized systems.