CVE-2025-59327 in Secure Disk for BitLocker
Summary
by MITRE • 08/12/2026
In CPSD CryptoPro Secure Disk for Bitlocker before v7.7.4, bootxsa.efi fails to properly validate LUKS encryption and, if encryption is present, all CryptoPro file integrity checks are skipped.
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Analysis
by VulDB Data Team • 08/12/2026
The vulnerability in CPSD CryptoPro Secure Disk for BitLocker prior to version 7.7.4 represents a critical security flaw that undermines the integrity of disk encryption mechanisms through improper validation of LUKS encryption. This issue specifically affects the bootxsa.efi component which serves as a crucial element in the secure boot process for encrypted volumes. The failure to properly validate LUKS encryption creates an attack surface where malicious actors can potentially bypass encryption protections by exploiting this validation gap.
The technical flaw manifests in the bootxsa.efi module's inability to correctly identify and verify LUKS encryption signatures during the boot process. When LUKS encryption is detected, the system should perform comprehensive file integrity checks to ensure that all components remain unmodified and secure. However, this validation failure causes the system to skip all CryptoPro file integrity checks entirely, effectively removing a critical layer of security verification. This behavior creates a scenario where an attacker could potentially modify encrypted files or boot components without detection.
From an operational impact perspective, this vulnerability exposes systems to significant risks including unauthorized access to encrypted data, potential data exfiltration, and bypass of security controls designed to protect sensitive information. The flaw particularly affects environments where disk encryption is critical for data protection, as it undermines the fundamental security assumptions that organizations rely upon when implementing BitLocker and CryptoPro solutions. Attackers could exploit this vulnerability to gain access to encrypted volumes without proper authentication or to modify system components that would normally be protected by integrity checks.
The vulnerability aligns with CWE-284 Access Control Issues and CWE-327 Use of a Broken or Risky Cryptographic Algorithm, as it represents a failure in access control validation and compromises the cryptographic security posture of the system. From an ATT&CK framework perspective, this vulnerability maps to T1566 Initial Access through the exploitation of system boot components and T1070 Indicator Removal on Host for potential evasion techniques that could be employed to hide malicious modifications.
Mitigation strategies should include immediate deployment of CPSD CryptoPro Secure Disk for BitLocker version 7.7.4 or later, which contains the necessary fixes for proper LUKS encryption validation. Organizations should also implement additional monitoring of boot processes and file integrity checks to detect potential exploitation attempts. System administrators should conduct thorough security assessments of encrypted volumes to identify any potential unauthorized modifications that may have occurred during the vulnerable period. Additionally, implementing layered security controls including network-based monitoring and endpoint detection solutions can help detect exploitation attempts that bypass traditional file integrity verification mechanisms.