EUVD-2025-210718
GHSA-5r37-4g77-fvg9
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Offline recovery requires physical disk access (AV:P); no privileges or interaction needed once the disk is accessible; confidentiality impact only.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
4DescriptionCVE.org
CPSD CryptoPro Secure Disk for Bitlocker before v7.7.4 fails to encrypt the initramfs contents, allowing for the offline recovery of secrets and cryptographic details.
AnalysisAI
CryptoPro Secure Disk for BitLocker before v7.7.4 stores initramfs contents in plaintext on disk, allowing a physical attacker to recover cryptographic keys and other secrets without defeating the encryption layer. The vulnerability was publicly disclosed at Black Hat USA 2026 by researcher Burch in a presentation titled 'The Cost of Obscurity,' suggesting the vendor's security model relied on implementation obscurity rather than cryptographic assurance. No public exploit identified at time of analysis; EPSS at 0.17% reflects the physical-access prerequisite that limits widespread automated exploitation.
Technical ContextAI
The initramfs (initial RAM filesystem) is a temporary Linux filesystem image loaded into RAM at boot time. In full-disk-encryption deployments, the initramfs typically contains the unlock logic - potentially including key derivation scripts, configuration referencing the BitLocker recovery mechanism, or pre-boot authentication material. CWE-311 (Missing Encryption of Sensitive Data) applies directly: the product, whose core purpose is protecting data-at-rest, fails to apply that protection to the initramfs partition or image stored on the same physical medium. CryptoPro Secure Disk for BitLocker is a third-party Linux integration layer that extends BitLocker-style encryption to Linux environments. The CPE data is not populated in NVD (cpe:2.3:a:n/a:n/a), and the vendor's advisory is located at https://www.cpsd.at/blog/. The fixed version is 7.7.4 per the CVE description.
RemediationAI
Upgrade to CPSD CryptoPro Secure Disk for BitLocker v7.7.4 or later, which resolves the unencrypted initramfs issue per the vendor's advisory at https://www.cpsd.at/blog/. Until the patch can be applied, compensating controls should focus on physical security: restrict physical access to affected endpoints, enforce full-chassis tamper detection, and enable BIOS/UEFI secure boot to prevent cold-boot or offline-mount attacks. Where possible, store the most sensitive cryptographic key material in a hardware TPM rather than on the initramfs itself - this limits what an attacker recovers from the plaintext image. Note that these compensating controls address the physical attack path only; they do not fix the underlying missing encryption. Network isolation provides no mitigation given the local/physical nature of exploitation.
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Same weakness CWE-311 – Missing Encryption of Sensitive Data
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External POC / Exploit Code
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