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The vulnerability exists within the precompile handling mechanism of the Cosmos EVM module. A specific flaw in the code allows for incorrect validation of input data when interacting with certain state-modifying precompiled contracts. This insufficient input sanitization can be exploited by a maliciously crafted transaction. When such a transaction is processed, it bypasses intended security checks, leading to unauthorized state changes. An attacker could manipulate this to alter smart contract storage or execute arbitrary operations outside the bounds of the intended contract logic, potentially resulting in loss of funds or control over the chain’s EVM state without proper authorization.
Platform: Cosmos EVM
Version: 0.3.0-0.3.1, 0.4.0-0.4.1
Vulnerability: Precompile Input Validation
Severity: Critical
date: 2025-10-21
Prediction: Patch Date 2025-10-28
What Undercode Say:
git clone https://github.com/cosmos/evm cd evm git checkout v0.4.1 grep -r "precompile" --include=".go" | grep -i "call"
// Pseudo-code illustrating the flawed validation
func (p Precompile) Run(input []byte) ([]byte, error) {
// Missing length check on input
if len(input) < 4 {
return nil, ErrInvalidInput
}
// Logic proceeds without full validation...
}
How Exploit:
Craft malicious transaction targeting specific precompiles with oversized or malformed input data to bypass state change checks, leading to unauthorized writes.
Protection from this CVE:
Upgrade to patched versions 0.3.2, 0.4.2, or 0.5.0 immediately. No known workarounds exist for chains utilizing precompiles.
Impact:
Unauthorized state modification, potential fund loss, and control over EVM execution context, compromising chain integrity.
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Sources:
Reported By: github.com
Extra Source Hub:
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