CVE-2020-19767 in 0xRACER
Summary
by MITRE • 09/08/2021
A lack of target address verification in the destroycontract() function of 0xRACER 1.0 allows attackers to steal tokens from victim users via a crafted script.
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Analysis
by VulDB Data Team • 09/10/2021
The vulnerability identified as CVE-2020-19767 represents a critical security flaw in the 0xRACER 1.0 smart contract system that fundamentally compromises the integrity of token transactions. This issue manifests within the destroycontract() function where insufficient validation mechanisms fail to verify the target address before executing destructive operations. The absence of proper address verification creates a pathway for malicious actors to manipulate contract behavior and redirect tokens to unauthorized destinations.
The technical implementation of this vulnerability stems from inadequate input validation within the smart contract's destroycontract() method. When users attempt to execute contract destruction operations, the system does not properly validate whether the intended target address is legitimate or authorized to receive the transferred tokens. This weakness aligns with CWE-20, which describes improper input validation as a fundamental security flaw that enables attackers to manipulate system behavior through malformed inputs. The flaw essentially allows an attacker to craft a malicious script that can redirect token transfers to addresses they control, effectively enabling unauthorized token theft.
From an operational perspective, this vulnerability presents a severe risk to users who interact with the 0xRACER 1.0 platform, as it directly enables financial loss through unauthorized token transfers. The attack vector requires minimal technical expertise to exploit, making it particularly dangerous for widespread abuse. Victims may unknowingly execute transactions that result in their tokens being diverted to attacker-controlled wallets, with no mechanism to prevent or recover the stolen assets. The impact extends beyond individual users to potentially compromise the entire platform's trustworthiness and financial stability.
The security implications of this vulnerability align with ATT&CK technique T1059.001, which covers command and scripting interpreter usage, as attackers can leverage the lack of verification to execute malicious scripts that manipulate contract state. Mitigation strategies should focus on implementing robust address validation mechanisms within the destroycontract() function, including thorough input sanitization and verification of target addresses against approved recipient lists. Additionally, the contract should incorporate proper access control measures and transaction logging to detect unauthorized attempts to manipulate token transfers. Implementing these protections would align with industry best practices for smart contract security and help prevent similar vulnerabilities from being exploited in future deployments.