Description
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.
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
Exploit-DB 1
- TrueCrypt 7 / VeraCrypt 1.13 - Drive Letter Symbolic Link Creation Privilege Escalation EDB-38403 · local · Oct 5, 2015 · verified
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
References
- https://veracrypt.codeplex.com/wikipage?title=Release%20Notes
- 38403 exploit
- [oss-security] 20150924 Re: CVE Request - TrueCrypt 7.1a and VeraCrypt 1.14 Local Elevation of Privilege mailing-list
- http://packetstormsecurity.com/files/133878/Truecrypt-7-Derived-Code-Windows-Drive-Letter-Symbolic-Link-Creation-Privilege-Escalation.html
- [oss-security] 20150922 CVE Request - TrueCrypt 7.1a and VeraCrypt 1.14 Local Elevation of Privilege mailing-list
- https://code.google.com/p/google-security-research/issues/detail?id=538