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CVE-2015-7358

Status Candidate

Overview

The IsDriveLetterAvailable method in Driver/Ntdriver.c in TrueCrypt 7.0, VeraCrypt before 1.15, and CipherShed, when running on Windows, does not properly validate drive letter symbolic links, which allows local users to mount an encrypted volume over an existing drive letter and gain privileges via an entry in the /GLOBAL?? directory.

Related Files

Truecrypt 7 Derived Code/Windows: Drive Letter Symbolic Link Creation Privilege Escalation
Posted Oct 5, 2015
Authored by Google Security Research, forshaw

The Windows driver used by projects derived from Truecrypt 7 (verified in Veracrypt and CipherShed) are vulnerable to a local elevation of privilege attack by abusing the drive letter symbolic link creation facilities to remap the main system drive. With the system drive remapped it's trivial to get a new process running under the local system account.

tags | exploit, local
systems | linux, windows
advisories | CVE-2015-7358
SHA-256 | bd1e8ffc132fe9efac975acbab5528bd06a2731798e1f40805ddc035d825f919
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