craigjbass clearancekit up to 5.0.9 EC Key store.db SecItemAdd kSecAttrAccess random values

Summaryinfo

A vulnerability, which was classified as problematic, was found in craigjbass clearancekit up to 5.0.9. This impacts the function SecItemAdd of the file store.db of the component EC Key. Such manipulation of the argument kSecAttrAccess leads to random values. This vulnerability is traded as CVE-2026-47134. An attack has to be approached locally. There is no exploit available.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in craigjbass clearancekit up to 5.0.9. Affected by this issue is the function SecItemAdd of the file store.db of the component EC Key. The manipulation of the argument kSecAttrAccess with an unknown input leads to a random values vulnerability. Using CWE to declare the problem leads to CWE-330. The product uses insufficiently random numbers or values in a security context that depends on unpredictable numbers. Impacted is confidentiality. CVE summarizes:

ClearanceKit intercepts file-system access events on macOS and enforces per-process access policies. The ECDSA private key used to sign the on-disk policy database (`/Library/Application Support/clearancekit/store.db`) is stored in the macOS System Keychain. The key was created via the two-step pattern `SecKeyCreateRandomKey` (in-memory) followed by `SecItemAdd(kSecValueRef:, kSecAttrAccess:)` (persist). Prior to version 5.0.10, for `kSecClassKey` items in the legacy System Keychain, `kSecAttrAccess` passed to `SecItemAdd` is silently ignored — the persisted key inherits no ACL restriction. The same access builder applied to `kSecClassGenericPassword` items correctly binds the ACL, making this bug specific to the EC key. The result is that any process running as root can use the key to produce valid signatures over arbitrary policy content. Version 5.0.10 fixes the issue. No known workarounds are available. Disabling the system extension and manually removing the System Keychain item labelled `clearancekit policy signing key` would prevent the forged-signature path but also disables policy enforcement.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-47134 since 05/18/2026. The exploitation is known to be difficult. Local access is required to approach this attack. Additional levels of successful authentication are needed for exploitation. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1600.001 by the MITRE ATT&CK project.

Upgrading to version 5.0.10 eliminates this vulnerability.

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Productinfo

Vendor

• craigjbass

Name

• clearancekit

Version

• 5.0.0
• 5.0.1
• 5.0.2
• 5.0.3
• 5.0.4
• 5.0.5
• 5.0.6
• 5.0.7
• 5.0.8
• 5.0.9

Website

• Product: https://github.com/craigjbass/clearancekit/

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