Executive Summary

This vulnerability is a signature malleability flaw in the SM2 digital signature algorithm implementation within the sm-crypto JavaScript library versions prior to 0.3.14. It allows an attacker to create a new valid signature for a previously signed message by manipulating an existing signature without needing any privileges or user interaction. The issue lies in the SM2 signature verification logic, which improperly verifies cryptographic signatures. [1]

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Impact Analysis

The vulnerability can impact you by compromising data integrity. An attacker can forge a new valid signature for a message that was already signed, potentially allowing unauthorized actions or acceptance of tampered data as legitimate. However, it does not affect confidentiality or availability. [1]

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Detection Guidance

Detection involves identifying if your system or network is using a vulnerable version of the sm-crypto library (prior to 0.3.14). You can check the version of sm-crypto in your project dependencies. For example, if using npm, run: `npm list sm-crypto` to see the installed version. Additionally, review your codebase for usage of sm-crypto's SM2 signature verification functions. There are no specific network detection commands provided for this vulnerability. [1]

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Mitigation Strategies

The immediate mitigation step is to upgrade the sm-crypto library to version 0.3.14 or later, where the signature malleability vulnerability in the SM2 signature verification logic has been patched. Avoid using vulnerable versions prior to 0.3.14 to prevent exploitation. [1]

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Compliance Impact

This vulnerability compromises data integrity by allowing an attacker to generate a valid signature for a previously signed message, which could lead to improper verification of cryptographic signatures. Such a compromise in data integrity may negatively impact compliance with standards and regulations like GDPR and HIPAA that require ensuring data integrity and authenticity. However, the provided resources do not explicitly discuss compliance implications. [1]

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