CVE-2017-20180 in libzerocoin
Summary
by MITRE • 03/06/2023
A vulnerability classified as critical has been found in Zerocoin libzerocoin. Affected is the function CoinSpend::CoinSpend of the file CoinSpend.cpp of the component Proof Handler. The manipulation leads to insufficient verification of data authenticity. Continious delivery with rolling releases is used by this product. Therefore, no version details of affected nor updated releases are available. The name of the patch is ce103a09ec079d0a0ed95475992348bed6e860de. It is recommended to apply a patch to fix this issue. VDB-222318 is the identifier assigned to this vulnerability.
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Analysis
by VulDB Data Team • 03/31/2023
The vulnerability identified as CVE-2017-20180 represents a critical security flaw within the Zerocoin library libzerocoin, specifically within the CoinSpend::CoinSpend function located in CoinSpend.cpp. This issue resides within the Proof Handler component of the cryptographic framework, which is fundamental to the zerocoin protocol's operation. The flaw stems from inadequate verification mechanisms that fail to properly authenticate data integrity during the coin spending process, creating a significant attack vector for malicious actors seeking to exploit the system's trust model. The vulnerability's classification as critical indicates its potential to enable unauthorized access or manipulation of cryptographic assets within the system.
The technical implementation of this flaw occurs within the coin spending verification logic where the system fails to adequately validate the authenticity of cryptographic proofs submitted during transactions. This insufficient verification allows for malformed or tampered proof data to be accepted as legitimate, potentially enabling double-spending attacks or unauthorized coin creation. The vulnerability's nature aligns with CWE-284, which addresses improper access control mechanisms, and CWE-327, which covers broken or weak cryptographic algorithms. The flaw specifically impacts the cryptographic proof validation process where the system should verify the mathematical correctness of zerocoin commitments and signatures but instead accepts potentially invalid proofs due to inadequate verification routines.
The operational impact of this vulnerability extends beyond simple transaction processing failures to potentially compromise the entire integrity of the zerocoin ecosystem. Attackers could exploit this weakness to create invalid coins or manipulate existing transactions, undermining the fundamental security assumptions of the zerocoin protocol. The continuous delivery model with rolling releases used by the affected system compounds the risk as patches may not be immediately available or consistently deployed across all installations. This vulnerability directly maps to several ATT&CK techniques including T1059 for execution of malicious code and T1552 for credential access through cryptographic weakness exploitation. The lack of specific version information makes it particularly challenging for organizations to assess their exposure levels and implement appropriate mitigations.
Organizations and developers should immediately implement the patch identified by the commit hash ce103a09ec079d0a0ed95475992348bed6e860de to address this vulnerability. The patch should be applied across all systems utilizing the affected libzerocoin library, particularly those implementing zerocoin-based cryptocurrencies or cryptographic protocols. Security teams should conduct comprehensive audits of their zerocoin implementations to identify any potential exploitation attempts or unauthorized transactions that may have occurred prior to patch deployment. The vulnerability's impact on data authenticity verification necessitates additional monitoring of transaction logs and cryptographic proof validation processes to detect any anomalous behavior that might indicate exploitation attempts. Implementation of this patch addresses the core cryptographic verification weakness while maintaining compatibility with existing zerocoin protocol standards and operational requirements.