EUVD-2025-210719
GHSA-97c2-3m3x-47gq
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
IMA bypass runs unsigned code from tmpfs, which requires local file placement/execution (AV:L, PR:L), but yields full code-integrity compromise of the host (C/I/A:H).
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
4DescriptionCVE.org
CPSD CryptoPro Secure Disk for Bitlocker before v7.7.4 fails to enforce IMA policy protections across temporary file systems, allowing for unsigned code to be executed from these locations.
AnalysisAI
Protection-mechanism bypass in CPSD CryptoPro Secure Disk for Bitlocker before v7.7.4 lets unsigned code run from temporary filesystems because the product fails to enforce its Integrity Measurement Architecture (IMA) policy across those locations. An attacker able to stage a binary in a tmpfs-style path can execute code that the integrity policy was meant to block, undermining the pre-boot/disk-encryption trust model. The flaw was disclosed in Black Hat USA 2026 research ('The Cost of Obscurity', Burch); no public exploit is identified at time of analysis, EPSS is low (0.17%, 6th percentile), and it is not in CISA KEV.
Technical ContextAI
The affected component is CPSD CryptoPro Secure Disk for Bitlocker, a pre-boot authentication and full-disk-encryption integration product. The root cause maps to CWE-693 (Protection Mechanism Failure): the Linux Integrity Measurement Architecture (IMA) appraisal policy - which is supposed to measure and enforce signatures on executables before allowing them to run - is not applied to temporary filesystems (e.g., tmpfs / temporary mount points). Because IMA appraisal gaps on those mounts, unsigned binaries placed there are executed without signature verification, defeating the code-integrity guarantee that IMA is deployed to provide. The CPE data (cpe:2.3:a:n/a:n/a) is a placeholder and provides no additional product/version precision beyond the description.
RemediationAI
Vendor-released patch: v7.7.4 - upgrade all CPSD CryptoPro Secure Disk for Bitlocker installations to v7.7.4 or later, which enforces IMA policy across temporary filesystems. Confirm the exact build and release guidance via the vendor blog (https://www.cpsd.at/blog/) and NVD (https://nvd.nist.gov/vuln/detail/CVE-2025-59326). Where immediate upgrade is not possible, compensating controls include hardening the IMA appraisal policy so tmpfs and other temporary mounts are covered or mounted noexec (trade-off: noexec on temporary mounts can break software that legitimately executes from those paths, so test before rollout), and restricting local/administrative access to the encrypted endpoints so an attacker cannot stage files in the affected locations (trade-off: tighter access control adds operational friction for legitimate admins). Validate any workaround against the vendor's official guidance, since an incomplete IMA policy is precisely what this flaw exploits.
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Same weakness CWE-693 – Protection Mechanism Failure
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External POC / Exploit Code
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