Impact Analysis

The vulnerability can impact you by allowing an attacker to bypass the integrity protection of the MAC in PKCS#12 files. This means that tampered or corrupted data could be accepted as authentic, potentially leading to unauthorized data modification or acceptance of malicious content without detection.

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Executive Summary

This vulnerability involves the PKCS#12 MAC verification process, where the length used for comparison is controlled by an attacker. Specifically, the verification compares the locally computed HMAC against the MAC from the PKCS#12 structure using a length taken directly from attacker-supplied input without verifying if it matches the actual digest length. This flaw allows a truncated or even zero-length MAC to be accepted, thereby weakening the integrity check and potentially allowing tampered data to be accepted as valid.

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Compliance Impact

This vulnerability weakens the integrity check on the MAC in PKCS#12 by allowing an attacker-controlled comparison length, which can result in acceptance of a mismatched or truncated MAC. This defeats the integrity protection of the MAC.

Since the integrity of cryptographic verification is compromised, systems relying on PKCS#12 for secure key storage and verification may be at increased risk of unauthorized data modification or tampering.

Such a weakness could negatively impact compliance with standards and regulations like GDPR and HIPAA, which require strong data integrity and protection mechanisms to safeguard sensitive personal and health information.

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