EUVD-2025-210714
GHSA-7xx9-9ph7-5fr7
Severity by source
AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
AV:L reflects disk-level local/physical access; PR:N holds because physical access bypasses OS authentication; full CIA impact from pre-boot code execution with access to cryptographic material.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
4DescriptionCVE.org
CPSD CryptoPro Secure Disk for Bitlocker before v7.7.4 fails to validate the integrity of the DataStore, a non-partitioned filesystem, responsible for storing configuration and cryptographic details. Crafted DataStore contents can impact service availability and/or allow for code execution in the context of high privilege.
AnalysisAI
Integrity validation failure in CPSD CryptoPro Secure Disk for BitLocker before v7.7.4 allows an attacker with local or physical disk access to craft malicious DataStore contents that trigger code execution in a high-privilege context or disrupt service availability on the host. The DataStore - a non-partitioned filesystem holding pre-boot configuration and cryptographic material - is parsed without authenticity verification, making it a viable Evil Maid attack surface. No public exploit identified at time of analysis, and EPSS at 0.18% (8th percentile) indicates very limited real-world exploitation activity; however, research presented at Black Hat USA 2026 details the vulnerability class.
Technical ContextAI
CPSD CryptoPro Secure Disk for BitLocker is an enterprise-grade pre-boot authentication and disk encryption management layer extending Windows BitLocker. It maintains a proprietary non-partitioned filesystem called the DataStore, written to raw disk space outside standard partition boundaries, to persist configuration parameters and cryptographic material required before the OS loads. CWE-345 (Insufficient Verification of Data Authenticity) is the root cause: the software reads and processes DataStore contents without verifying their integrity or authenticity, meaning an attacker who can write to the raw disk area can inject crafted data structures that the pre-boot runtime will blindly consume. CPE data in NVD is recorded as 'n/a n/a', providing no additional product granularity beyond the CVE description itself. Because this attack surface exists in the pre-boot stage - before OS-enforced access controls engage - the standard Windows privilege model does not protect it from physical access scenarios.
RemediationAI
Upgrade to CPSD CryptoPro Secure Disk for BitLocker v7.7.4 or later, the version explicitly identified in the CVE as introducing DataStore integrity validation. Consult the vendor advisory at https://www.cpsd.at/blog/ for release notes and migration guidance. If immediate patching is not feasible, the most effective compensating control is enforcing physical security: restrict unescorted physical access to affected endpoints, enable chassis intrusion detection where available, and deploy BIOS/UEFI boot-order locks with strong passwords to prevent booting from external media (the primary vector for DataStore tampering). Note that boot-order restrictions alone do not address the risk if an attacker gains brief unescorted access and can connect directly to the disk (e.g., via M.2 extraction). Enabling BitLocker's own TPM binding does not substitute for the vendor patch, as the vulnerable DataStore is processed by CryptoPro Secure Disk's own runtime, not by BitLocker's native integrity checks.
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