CVE-2025-59319 in BitLocker
Summary
by MITRE • 08/12/2026
CPSD CryptoPro Secure Disk for Bitlocker before v7.7.4 fails to certify the integrity of the intended boot partition and selects the first partition index matching a hardcoded type value. A crafted Linux partition could be inserted ahead of this intended target, allowing for code execution in the context of high privilege.
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Analysis
by VulDB Data Team • 08/12/2026
The vulnerability in CPSD CryptoPro Secure Disk for BitLocker versions prior to v7.7.4 represents a critical flaw in the boot partition selection mechanism that directly impacts system integrity and privilege escalation capabilities. This issue stems from a design decision where the software fails to properly validate the integrity of the intended boot partition before proceeding with the boot process. The system relies on a hardcoded type value to identify target partitions, but this approach lacks proper verification mechanisms that would ensure the selected partition matches the expected configuration. The flaw creates an environment where malicious actors can manipulate the partition table structure to their advantage.
The technical implementation of this vulnerability involves the software's failure to perform cryptographic or structural validation of boot partitions before execution. When the system encounters multiple partitions with matching hardcoded type values, it defaults to selecting the first available match without confirming that this partition contains legitimate boot code. This behavior aligns with CWE-220, which addresses improper handling of partition tables and boot sequence validation. The flaw essentially creates a race condition where an attacker can insert a crafted Linux partition at an earlier index in the partition table, effectively hijacking the boot process before the intended Windows BitLocker partition is properly validated.
The operational impact of this vulnerability extends beyond simple privilege escalation to encompass full system compromise capabilities. Since the malicious partition executes code within the high-privilege context of the boot process, attackers can bypass traditional security controls and gain root-level access to the target system. This scenario allows for persistent backdoor installation, data exfiltration, and complete system takeover without requiring physical access or additional authentication mechanisms. The vulnerability affects systems that rely on CryptoPro Secure Disk for BitLocker integration, potentially compromising enterprise environments where disk encryption is critical for security.
Mitigation strategies must focus on both immediate remediation and long-term architectural improvements to prevent similar issues in future implementations. Organizations should immediately upgrade to CPSD CryptoPro Secure Disk for BitLocker version 7.7.4 or later, which includes proper partition integrity validation mechanisms. The solution involves implementing cryptographic checksum verification, digital signature validation of boot partitions, and maintaining a secure partition table order that cannot be easily manipulated by unauthorized parties. This vulnerability demonstrates the importance of following ATT&CK framework principles related to privilege escalation and boot process manipulation, where adversaries often target system components during early boot phases to establish persistent access. Additionally, organizations should implement proper partition table monitoring and integrity checking mechanisms as part of their overall security posture to detect unauthorized modifications to critical system structures.